1,792 results match your criteria wearable electrodes

Lab-on-Eyeglasses to Monitor Kidneys and Strengthen Vulnerable Populations in Pandemics: Machine Learning in Predicting Serum Creatinine Using Tear Creatinine.

Anal Chem 2021 Jul 21. Epub 2021 Jul 21.

Pilot Plant Research and Development Laboratory, King Mongkut's University of Technology, Thonburi 10150, Thailand.

The serum creatinine level is commonly recognized as a measure of glomerular filtration rate (GFR) and is defined as an indicator of overall renal health. A typical procedure in determining kidney performance is venipuncture to obtain serum creatinine in the blood, which requires a skilled technician to perform on a laboratory basis and multiple clinical steps to acquire a meaningful result. Recently, wearable sensors have undergone immense development, especially for noninvasive health monitoring without a need for a blood sample. Read More

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Wearable and Fully Biocompatible All-in-One Structured ″Paper-Like″ Zinc Ion Battery.

ACS Appl Mater Interfaces 2021 Jul 19. Epub 2021 Jul 19.

Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, P.R. China.

A power supply with the characteristics of portability and safety will be one of the dominating mainstreams for future wearable electronics and implantable biomedical devices. The conventional energy storage devices with typical sandwich structures have complicated components and low mechanical properties, suffering from the apparent performance degradation during deformation and hindering the possibility of implanting biomedical units. Herein, a novel all-in-one structure ″paper-like″ zinc ion battery (ZIB) was designed and assembled from an electrospun polyacrylonitrile (PAN) nanomembrane (as the separator) with in situ deposited anode (zinc nanosheets) and cathode (MnO nanosheets), which ensures the monolith under different bending states by avoiding the relative sliding and detaching between the integrated layers. Read More

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Wireless Soft Scalp Electronics and Virtual Reality System for Motor Imagery-Based Brain-Machine Interfaces.

Adv Sci (Weinh) 2021 Jul 17:e2101129. Epub 2021 Jul 17.

George W. Woodruff School of Mechanical Engineering, College of Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.

Motor imagery offers an excellent opportunity as a stimulus-free paradigm for brain-machine interfaces. Conventional electroencephalography (EEG) for motor imagery requires a hair cap with multiple wired electrodes and messy gels, causing motion artifacts. Here, a wireless scalp electronic system with virtual reality for real-time, continuous classification of motor imagery brain signals is introduced. Read More

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All-Organic Flexible Ferroelectret Nanogenerator with Fabric-Based Electrodes for Self-Powered Body Area Networks.

Small 2021 Jul 16:e2103161. Epub 2021 Jul 16.

Electrical Insulation Research Center, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA.

Due to their electrically polarized air-filled internal pores, optimized ferroelectrets exhibit a remarkable piezoelectric response, making them suitable for energy harvesting. Expanded polytetrafluoroethylene (ePTFE) ferroelectret films are laminated with two fluorinated-ethylene-propylene (FEP) copolymer films and internally polarized by corona discharge. Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)-coated spandex fabric is employed for the electrodes to assemble an all-organic ferroelectret nanogenerator (FENG). Read More

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Self-Powered Diaper Sensor with Wireless Transmitter Powered by Paper-Based Biofuel Cell with Urine Glucose as Fuel.

ACS Sens 2021 Jul 15. Epub 2021 Jul 15.

Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

A self-driven sensor that can detect urine and urine sugar and can be mounted on diapers is desirable to reduce the burden of long-term care. In this study, we created a paper-based glucose biofuel cell that can be mounted on diapers to detect urine sugar. Electrodes for biofuel cells were produced by printing MgO-templated porous carbon on which poly(glycidyl methacrylate) was modified using graft polymerization. Read More

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Printable elastomeric electrodes with sweat-enhanced conductivity for wearables.

Sci Adv 2021 Jul 14;7(29). Epub 2021 Jul 14.

School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.

We rationally synthesized the thermoplastic and hydrophilic poly(urethane-acrylate) (HPUA) binder for a type of printable and stretchable Ag flakes-HPUA (Ag-HPUA) electrodes in which the conductivity can be enhanced by human sweat. In the presence of human sweat, the synergistic effect of Cl and lactic acid enables the partial removal of insulating surfactant on silver flakes and facilitates sintering of the exposed silver flakes, thus the resistance of Ag-HPUA electrodes can be notably reduced in both relaxed and stretched state. The on-body data show that the resistance of one electrode has been decreased from 3. Read More

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Solid-State Double-Network Hydrogel Redox Electrolytes for High-Performance Flexible Supercapacitors.

ACS Appl Mater Interfaces 2021 Jul 14. Epub 2021 Jul 14.

Flexible supercapacitors have great potential applications in wearable and portable electronics, but their practical applications were limited due to the low energy density and mechanical flexibility of solid-state electrolytes used for the construction of flexible supercapacitors. In this study, we first report the solid-state double-network (DN) hydrogel electrolytes (HEs) incorporated with NaMoO redox additives. It is found that the solid-state DN HEs with NaMoO redox additives exhibit high electrochemical performance, excellent mechanical properties, and fast self-recovery features. Read More

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The power of ECG in multimodal patient-specific seizure monitoring: Added value to an EEG-based detector using limited channels.

Epilepsia 2021 Jul 9. Epub 2021 Jul 9.

Department of Microelectronics, TU Delft, Delft, Netherlands.

Objective: Wearable seizure detection devices could provide more reliable seizure documentation outside the hospital compared to seizure self-reporting by patients, which is the current standard. Previously, during the SeizeIT1 project, we studied seizure detection based on behind-the-ear electroencephalography (EEG). However, the obtained sensitivities were too low for practical use, because not all seizures are associated with typical ictal EEG patterns. Read More

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Nanomaterials-patterned flexible electrodes for wearable health monitoring: a review.

J Mater Sci 2021 Jun 28:1-43. Epub 2021 Jun 28.

Department of Textile Engineering, Khulna University of Engineering & Technology, Khulna, 9203 Bangladesh.

Abstract: Electrodes fabricated on a flexible substrate are a revolutionary development in wearable health monitoring due to their lightweight, breathability, comfort, and flexibility to conform to the curvilinear body shape. Different metallic thin-film and plastic-based substrates lack comfort for long-term monitoring applications. However, the insulating nature of different polymer, fiber, and textile substrates requires the deposition of conductive materials to render interactive functionality to substrates. Read More

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Objective assessment of impulse control disorder in patients with Parkinson's disease using a low-cost LEGO-like EEG headset: a feasibility study.

J Neuroeng Rehabil 2021 Jul 2;18(1):109. Epub 2021 Jul 2.

Department of Diagnostic Radiology, Kaohsiung Chang Gung Memorial Hospital, and Chang Gung University College of Medicine, Kaohsiung, Taiwan.

Background: Patients with Parkinson's disease (PD) can develop impulse control disorders (ICDs) while undergoing a pharmacological treatment for motor control dysfunctions with a dopamine agonist (DA). Conventional clinical interviews or questionnaires can be biased and may not accurately diagnose at the early stage. A wearable electroencephalogram (EEG)-sensing headset paired with an examination procedure can be a potential user-friendly method to explore ICD-related signatures that can detect its early signs and progression by reflecting brain activity. Read More

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Inkjet Printed Textile Force Sensitive Resistors for Wearable and Healthcare Devices.

Adv Healthc Mater 2021 Jul 1:e2100893. Epub 2021 Jul 1.

Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC, 27606, USA.

Pressure sensors for wearable healthcare devices, particularly force sensitive resistors (FSRs) are widely used to monitor physiological signals and human motions. However, current FSRs are not suitable for integration into wearable platforms. This work presents a novel technique for developing textile FSRs (TFSRs) using a combination of inkjet printing of metal-organic decomposition silver inks and heat pressing for facile integration into textiles. Read More

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Printed Graphene, Nanotubes and Silver Electrodes Comparison for Textile and Structural Electronics Applications.

Sensors (Basel) 2021 Jun 11;21(12). Epub 2021 Jun 11.

Institute of Metrology and Biomedical Engineering, Faculty of Mechatronics, Warsaw University of Technology, Św. Andrzeja Boboli 8, 02-525 Warsaw, Poland.

Due to the appearance of smart textiles and wearable electronics, the need for electro-conductive textiles and electro-conductive paths on textiles has become clear. In this article the results of a test of developed textile electro-conductive paths obtained by applying the method of screen printing pastes containing silver nanoparticles and carbon (graphene, nanotubes, graphite) are presented. Conducted research included analysis of the adhesion test, as well as evaluation of the surface resistance before and after the washing and bending cycles. Read More

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Wearable Smart Textiles for Long-Term Electrocardiography Monitoring-A Review.

Sensors (Basel) 2021 Jun 17;21(12). Epub 2021 Jun 17.

Department of Materials, Textiles and Chemical Engineering, Ghent University, 9000 Gent, Belgium.

The continuous and long-term measurement and monitoring of physiological signals such as electrocardiography (ECG) are very important for the early detection and treatment of heart disorders at an early stage prior to a serious condition occurring. The increasing demand for the continuous monitoring of the ECG signal needs the rapid development of wearable electronic technology. During wearable ECG monitoring, the electrodes are the main components that affect the signal quality and comfort of the user. Read More

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Carbon Nanotube Fibers Decorated with MnO for Wire-Shaped Supercapacitor.

Molecules 2021 Jun 7;26(11). Epub 2021 Jun 7.

Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44-bus 2450, B-3001 Leuven, Belgium.

Fibers made from CNTs (CNT fibers) have the potential to form high-strength, lightweight materials with superior electrical conductivity. CNT fibers have attracted great attention in relation to various applications, in particular as conductive electrodes in energy applications, such as capacitors, lithium-ion batteries, and solar cells. Among these, wire-shaped supercapacitors demonstrate various advantages for use in lightweight and wearable electronics. Read More

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Carbonized Cotton Fabric-Based Flexible Capacitive Pressure Sensor Using a Porous Dielectric Layer with Tilted Air Gaps.

Sensors (Basel) 2021 Jun 4;21(11). Epub 2021 Jun 4.

Department of Organic Materials and Fiber Engineering, Soongsil University, Seoul 06978, Korea.

Flexible and wearable pressure sensors have attracted significant attention owing to their roles in healthcare monitoring and human-machine interfaces. In this study, we introduce a wide-range, highly sensitive, stable, reversible, and biocompatible pressure sensor based on a porous Ecoflex with tilted air-gap-structured and carbonized cotton fabric (CCF) electrodes. The knitted structure of electrodes demonstrated the effectiveness of the proposed sensor in enhancing the pressure-sensing performance in comparison to a woven structure due to the inherent properties of naturally generated space. Read More

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Electrographic seizure monitoring with a novel, wireless, single-channel EEG sensor.

Clin Neurophysiol Pract 2021 29;6:172-178. Epub 2021 May 29.

Department of Neurology, University of Colorado Anschutz Medical Center, Aurora, CO, USA.

Objective: Recording seizures using personal seizure diaries can be challenging during everyday life and many seizures are missed or mis-reported. People living with epilepsy could benefit by having a more accurate and objective wearable EEG system for counting seizures that can be used outside of the hospital. The objective of this study was to (1) determine which seizure types can be electrographically recorded from the scalp below the hairline, (2) determine epileptologists' ability to identify electrographic seizures from single-channels extracted from full-montage wired-EEG, and (3) determine epileptologists' ability to identify electrographic seizures from Epilog, a wireless single-channel EEG sensor. Read More

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Covalently Aligned MoS2-CNTs Hetero-Architecture for High-Performance Electrochemical Capacitors.

Angew Chem Int Ed Engl 2021 Jun 28. Epub 2021 Jun 28.

Tsinghua University, Department of Chemical Engineering, CHINA.

Advanced 2D nanosheets architectures that fundamentally promote ions dynamic transportation and storage capacity, are significantly pivotal for high-performance electrochemical capacitors (ECs). However, the restacking microstructure, weak interlayer conduction and blocked electroactive utilization usually lead to a low energy density. Herein, we develop an ordered hetero-architecture of MoS 2 -CNTs, in which CNTs are vertically grafted within MoS 2 framework by C-Mo covalent bond. Read More

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Surface modification of liquid metal as an effective approach for deformable electronics and energy devices.

Chem Sci 2021 Feb 2;12(8):2760-2777. Epub 2021 Feb 2.

School of Material Science and Engineering, Nanyang Technological University 50 Nanyang Avenue Singapore 639798

The fields of flexible or stretchable electronics and energy devices, reconfigurable and compliant soft robotics, wearable e-textiles or health-care devices have paid significant attention to the need of deformable conductive electrodes due to its critical role in device performances. Gallium-based liquid metals, such as the eutectic gallium-indium (EGaIn) being an electrically conductive liquid phase at room temperature, have attracted immense interests as a promising candidate for deformable conductor. However, in the case of bulk liquid metal, there are several limitations such as the need of encapsulation, dispersion in a polymer matrix, or accurate patterning. Read More

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February 2021

Recent advances in electrode development for biomedical applications.

Biomed Eng Lett 2021 May 21;11(2):107-115. Epub 2021 Apr 21.

Department of Electronic Engineering, Gachon University, 1342 Seongnam-daero, Seongnam, 13120 Republic of Korea.

Elaborate electrodes that enable adhesion to the skin surface and effectively collect vital signs are necessitated. In recent years, various electrode materials and novel structures have been developed, and they have garnered scientific attention due to their higher sensing performances compared with those of conventional electrode-based sensors. This paper provides an overview of recent advances in biomedical sensors, focusing on the development of novel electrodes. Read More

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A fully 3D printed electronic skin with bionic high resolution and air permeable porous structure.

J Colloid Interface Sci 2021 Jun 10;602:452-458. Epub 2021 Jun 10.

Micro-Nano System Research Center, Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, China. Electronic address:

The bionic application of electronic skin (e-skin) requires a high resolution close to that of human skin, while its long-term attachment to human body or robotic skin requires a porous structure that is air permeable and enables hair growth. To simultaneously meet the requirements of high resolution and porous structure, as well as improve the sensing performance, we propose a fully 3D printed e-skin with high-resolution and air permeable porous structure. The flexible substrate and electrodes are 3D printed by a direct ink writing extrusion printer. Read More

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Wire-in-Wire TiO/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity.

Nanomicro Lett 2021 Apr 9;13(1):107. Epub 2021 Apr 9.

Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195-2120, USA.

Wearable and portable mobile phones play a critical role in the market, and one of the key technologies is the flexible electrode with high specific capacity and excellent mechanical flexibility. Herein, a wire-in-wire TiO/C nanofibers (TiO ww/CN) film is synthesized via electrospinning with selenium as a structural inducer. The interconnected carbon network and unique wire-in-wire nanostructure cannot only improve electronic conductivity and induce effective charge transports, but also bring a superior mechanic flexibility. Read More

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Ternary MOF-Based Redox Active Sites Enabled 3D-on-2D Nanoarchitectured Battery-Type Electrodes for High-Energy-Density Supercapatteries.

Nanomicro Lett 2020 Nov 2;13(1):17. Epub 2020 Nov 2.

Institute for Wearable Convergence Electronics, Department of Electronic Engineering, Kyung Hee University, 1732 Deogyeong-daero, Gihung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea.

Designing rationally combined metal-organic frameworks (MOFs) with multifunctional nanogeometries is of significant research interest to enable the electrochemical properties in advanced energy storage devices. Herein, we explored a new class of binder-free dual-layered Ni-Co-Mn-based MOFs (NCM-based MOFs) with three-dimensional (3D)-on-2D nanoarchitectures through a polarity-induced solution-phase method for high-performance supercapatteries. The hierarchical NCM-based MOFs having grown on nickel foam exhibit a battery-type charge storage mechanism with superior areal capacity (1311. Read More

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November 2020

3D Printing of NiCoP/TiC MXene Architectures for Energy Storage Devices with High Areal and Volumetric Energy Density.

Nanomicro Lett 2020 Jul 9;12(1):143. Epub 2020 Jul 9.

College of Energy, Soochow Institute for Energy and Materials InnovationS (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, 215006, Suzhou, Jiangsu, People's Republic of China.

Designing high-performance electrodes via 3D printing for advanced energy storage is appealing but remains challenging. In normal cases, light-weight carbonaceous materials harnessing excellent electrical conductivity have served as electrode candidates. However, they struggle with undermined areal and volumetric energy density of supercapacitor devices, thereby greatly impeding the practical applications. Read More

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Electron-Induced Perpendicular Graphene Sheets Embedded Porous Carbon Film for Flexible Touch Sensors.

Nanomicro Lett 2020 Jun 25;12(1):136. Epub 2020 Jun 25.

Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.

Graphene-based materials on wearable electronics and bendable displays have received considerable attention for the mechanical flexibility, superior electrical conductivity, and high surface area, which are proved to be one of the most promising candidates of stretching and wearable sensors. However, polarized electric charges need to overcome the barrier of graphene sheets to cross over flakes to penetrate into the electrode, as the graphene planes are usually parallel to the electrode surface. By introducing electron-induced perpendicular graphene (EIPG) electrodes incorporated with a stretchable dielectric layer, a flexible and stretchable touch sensor with "in-sheet-charges-transportation" is developed to lower the resistance of carrier movement. Read More

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Hierarchically Microstructure-Bioinspired Flexible Piezoresistive Bioelectronics.

ACS Nano 2021 Jun 15. Epub 2021 Jun 15.

Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China.

The naturally microstructure-bioinspired piezoresistive sensor for human-machine interaction and human health monitoring represents an attractive opportunity for wearable bioelectronics. However, due to the trade-off between sensitivity and linear detection range, obtaining piezoresistive sensors with both a wide pressure monitoring range and a high sensitivity is still a great challenge. Herein, we design a hierarchically microstructure-bioinspired flexible piezoresistive sensor consisting of a hierarchical polyaniline/polyvinylidene fluoride nanofiber (HPPNF) film sandwiched between two interlocking electrodes with microdome structure. Read More

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Highly Thermal-Wet Comfortable and Conformal Silk-Based Electrodes for On-Skin Sensors with Sweat Tolerance.

ACS Nano 2021 06 10;15(6):9955-9966. Epub 2021 Jun 10.

Innovative Centre for Flexible Devices (iFLEX), Max Planck-NTU Joint Lab for Artificial Senses, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore.

Noninvasive and seamless interfacing between the sensors and human skin is highly desired for wearable healthcare. Thin-film-based soft and stretchable sensors can to some extent form conformal contact with skin even under dynamic movements for high-fidelity signals acquisition. However, sweat accumulation underneath these sensors for long-term monitoring would compromise the thermal-wet comfort, electrode adherence to the skin, and signal fidelity. Read More

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A highly conductive self-assembled multilayer graphene nanosheet film for electronic tattoos in the applications of human electrophysiology and strain sensing.

Nanoscale 2021 Jun 9;13(24):10798-10806. Epub 2021 Jun 9.

School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China.

Highly conductive, conformable and gel-free electrodes are desirable in human electrophysiology. Besides, intimately coupling with human skin, wearable strain sensors can detect numerous physiological signals, such as wrist pulse and breath. In this study, a multilayer graphene nanosheet film (MGNF) with high conductivity was prepared by the Marangoni self-assembly for using in tattoo dry electrodes (TDEs) and in a graphene tattoo strain sensor (GTSS). Read More

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Steady-State and Transient Performance of Ion-Sensitive Electrodes Suitable for Wearable and Implantable Electro-chemical Sensing.

IEEE Trans Biomed Eng 2021 Jun 8;PP. Epub 2021 Jun 8.

Traditional Potentiometric Ion-selective Electrodes (ISE) are widely used in industrial and clinical settings. The simplicity and small footprint of ISE have encouraged their recent adoption as wearable/implantable sensors for personalized healthcare and precision agriculture, creating a new set of unique challenges absent in traditional ISE. In this paper, we develop a fundamental physics-based model to describe both steady-state and transient responses of ISE relevant for wearable/implantable sensors. Read More

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Design and Characterization of a Textile Electrode System for the Detection of High-Density sEMG.

IEEE Trans Neural Syst Rehabil Eng 2021 15;29:1110-1119. Epub 2021 Jun 15.

Muscle activity monitoring in dynamic conditions is a crucial need in different scenarios, ranging from sport to rehabilitation science and applied physiology. The acquisition of surface electromyographic (sEMG) signals by means of grids of electrodes (High-Density sEMG, HD-sEMG) allows obtaining relevant information on muscle function and recruitment strategies. During dynamic conditions, this possibility demands both a wearable and miniaturized acquisition system and a system of electrodes easy to wear, assuring a stable electrode-skin interface. Read More

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Toward Flexible Zinc-Air Batteries with Self-Supported Air Electrodes.

Small 2021 Jun 4:e2006773. Epub 2021 Jun 4.

Key Laboratory for Colloid and Interface Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.

The compelling demand for higher energy performance, flexibility, and miniaturization is the main driving force of the energy storage and conversion industry's quest for flexible devices based on new integration and fabrication process. Herein, the recent advances on the development of flexible zinc-air batteries based on self-supported air electrodes are summarized, focusing on the multiscale and systematic design principles for the design of flexible air electrodes. With the electrocatalytic activity regulation and structural engineering strategies, the rational design of self-supported air electrodes is discussed in integrated devices to underpin the good flexibility for wearable requirement. Read More

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