Abstract
Abstract Most of the semiconductor nanocatalysts, for visible light driven water oxidation, exhibit low electrochemical performance either due to wide band structures or rapid recombination of photogenerated excitons. Considering the synergistic effect of band gap engineered mixed metal oxide CoSnO3 and good conductivity of reduced graphene oxide (rGO), we report a novel integrated CoSnO3-rGO nanocomposite towards light emitting diode (LED) induced photoelectrocatalytic water splitting. The surface decorated quantum sized CoSnO3-rGO nanoheterojunction has been synthesized using simple hydrothermal technique and characterized using sophisticated analytical instruments. The photoelectrocatalytic activity was evaluated with linear sweep voltammetry and Controlled potential electrolysis. The CoSnO3-rGO nanocomposite catalyst showed excellent photoelectrocatalytic activity towards water oxidation under neutral condition with a low overpotential of ~340 mV at 1.0 mAcm−2 with Tafel slope of 68 mV per decade. The catalyst exhibited good oxygen evolution with Faradic efficiency (86%), good structural stability and reproducible response over six days of operation with two days interval. The band gap engineered mixed metal oxide nanocomposite have been found to harvest the white LED light effectively and hybridization with electron acceptor rGO further increased the lifetime of charge carriers thereby increasing the photoelectrocatalytic performance.
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