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.

中文翻译：

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在 rGO 基质中封装带隙工程 CoSnO3 混合金属氧化物纳米复合材料：一种在中性 pH 值下实现 LED 光诱导光电催化水氧化的新型催化剂

摘要 大多数用于可见光驱动水氧化的半导体纳米催化剂由于宽带结构或光生激子的快速复合而表现出较低的电化学性能。考虑到带隙设计的混合金属氧化物 CoSnO3 的协同效应和还原氧化石墨烯 (rGO) 的良好导电性，我们报告了一种用于发光二极管 (LED) 诱导光电催化水分解的新型集成 CoSnO3-rGO 纳米复合材料。表面装饰的量子尺寸 CoSnO3-rGO 纳米异质结已使用简单的水热技术合成，并使用复杂的分析仪器进行表征。采用线性扫描伏安法和可控电位电解法评价光电催化活性。CoSnO3-rGO 纳米复合催化剂在中性条件下对水氧化表现出优异的光电催化活性，在 1.0 mAcm-2 时具有 ~340 mV 的低过电位，塔菲尔斜率为 68 mV/十年。该催化剂表现出良好的析氧效率，法拉第效率 (86%)、良好的结构稳定性和在 2 天间隔运行 6 天后的可重现响应。已发现带隙工程混合金属氧化物纳米复合材料可以有效地收集白光 LED 光，并且与电子受体 rGO 的杂化进一步增加了电荷载流子的寿命，从而提高了光电催化性能。该催化剂表现出良好的析氧效率，法拉第效率 (86%)、良好的结构稳定性和在 2 天间隔运行 6 天后的可重现响应。已发现带隙工程混合金属氧化物纳米复合材料可以有效地收集白光 LED 光，并且与电子受体 rGO 的杂化进一步增加了电荷载流子的寿命，从而提高了光电催化性能。该催化剂表现出良好的析氧效率，法拉第效率 (86%)、良好的结构稳定性和在 2 天间隔运行 6 天后的可重现响应。已发现带隙工程混合金属氧化物纳米复合材料可以有效地收集白光 LED 光，并且与电子受体 rGO 的杂化进一步增加了电荷载流子的寿命，从而提高了光电催化性能。