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Step-Scheme Heterojunction between CdS Nanowires and Facet-Selective Assembly of MnOx-BiVO4 for an Efficient Visible-Light-Driven Overall Water Splitting
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsami.1c11740 Devipriya Gogoi 1 , Adit Kumar Shah 2 , Ponnala Rambabu 1 , Mohammad Qureshi 2 , Animes Kumar Golder 1 , Nageswara Rao Peela 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-09-14 , DOI: 10.1021/acsami.1c11740 Devipriya Gogoi 1 , Adit Kumar Shah 2 , Ponnala Rambabu 1 , Mohammad Qureshi 2 , Animes Kumar Golder 1 , Nageswara Rao Peela 1
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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/MnOx-BiVO4 photocatalyst was synthesized by spatial deposition of MnOx and one-dimensional (1D) CdS nanowires on a three-dimensional (3D) decahedron BiVO4 surface. The photocatalytic activity of CdS/MnOx-BiVO4 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/MnOx-BiVO4 exhibited the highest H2 and O2 production rates of 1.01 and 0.51 mmol g–1 h–1, 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 (MnOx and Pt) with the photocatalysts (BiVO4 and CdS) in the 5CdS/MnOx-BiVO4 heterojunction. The significance of the presence of MnOx and Pt cocatalysts on the selective facets of BiVO4 for efficient overall water splitting reaction is highlighted in this work.
中文翻译：
CdS 纳米线和 MnOx-BiVO4 的小面选择性组装之间的阶梯式异质结，用于有效的可见光驱动的整体水分解
光生载流子的空间分离和传输对于构建将太阳能转化为化学能的高效光催化剂至关重要。通过在三维 (3D) 十面体 BiVO 4表面上空间沉积 MnO x和一维 (1D) CdS 纳米线，合成了阶梯式 CdS/MnO x -BiVO 4光催化剂。研究了CdS/MnO x -BiVO 4对整个水分解反应的光催化活性，在可见光照射下没有牺牲试剂。使用高端表征技术对合成的光催化剂进行了彻底分析。5CdS/MnO x -BiVO 4在没有任何牺牲试剂的情况下，H 2和 O 2 的产量最高，分别为 1.01 和 0.51 mmol g –1 h –1，表观量子产率为 11.3%。优异的光活性是由于氧空位的存在以及有效的电荷分离/转移特性以及助催化剂（MnO x和 Pt）与5CdS/MnO x -BiVO 4异质结中的光催化剂（BiVO 4和 CdS）的强相互作用。MnO x和 Pt 助催化剂的存在对 BiVO 4选择性方面的重要性 在这项工作中强调了有效的整体水分解反应。
更新日期：2021-09-29
中文翻译：
CdS 纳米线和 MnOx-BiVO4 的小面选择性组装之间的阶梯式异质结，用于有效的可见光驱动的整体水分解
光生载流子的空间分离和传输对于构建将太阳能转化为化学能的高效光催化剂至关重要。通过在三维 (3D) 十面体 BiVO 4表面上空间沉积 MnO x和一维 (1D) CdS 纳米线，合成了阶梯式 CdS/MnO x -BiVO 4光催化剂。研究了CdS/MnO x -BiVO 4对整个水分解反应的光催化活性，在可见光照射下没有牺牲试剂。使用高端表征技术对合成的光催化剂进行了彻底分析。5CdS/MnO x -BiVO 4在没有任何牺牲试剂的情况下，H 2和 O 2 的产量最高，分别为 1.01 和 0.51 mmol g –1 h –1，表观量子产率为 11.3%。优异的光活性是由于氧空位的存在以及有效的电荷分离/转移特性以及助催化剂（MnO x和 Pt）与5CdS/MnO x -BiVO 4异质结中的光催化剂（BiVO 4和 CdS）的强相互作用。MnO x和 Pt 助催化剂的存在对 BiVO 4选择性方面的重要性 在这项工作中强调了有效的整体水分解反应。
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