Publications by authors named "Ponnala Rambabu"

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Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnO-BiVO for an Efficient Visible-Light-Driven Overall Water Splitting.

ACS Appl Mater Interfaces 2021 Sep 14;13(38):45475-45487. Epub 2021 Sep 14.

Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.

The spatial separation and transport of photogenerated charge carriers is crucial in building an efficient photocatalyst for solar energy conversion into chemical energy. A step-scheme CdS/MnO-BiVO photocatalyst was synthesized by spatial deposition of MnO and one-dimensional (1D) CdS nanowires on a three-dimensional (3D) decahedron BiVO surface. The photocatalytic activity of CdS/MnO-BiVO for the overall water-splitting reaction was investigated without sacrificial reagent under visible light irradiation. The synthesized photocatalysts were thoroughly analyzed using high-end characterization techniques. The 5CdS/MnO-BiVO exhibited the highest H and O production rates of 1.01 and 0.51 mmol g h, respectively, with an apparent quantum yield of 11.3% in the absence of any sacrificial reagent. The excellent photoactivity is due to the presence of oxygen vacancies along with effective charge separation/transfer properties and strong interaction of cocatalysts (MnO and Pt) with the photocatalysts (BiVO and CdS) in the 5CdS/MnO-BiVO heterojunction. The significance of the presence of MnO and Pt cocatalysts on the selective facets of BiVO for efficient overall water splitting reaction is highlighted in this work.
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September 2021