Two-dimensional (2D) oxysulfide nanosheets with sulfur-rich vacancy as an visible-light-driven difunctional photocatalyst for hydrogen and oxygen evolution
Source abstract
Abstract
The design and development of photocatalysts is the key to achieving efficient photocatalytic water splitting. In this study, a novel two-dimensional (2D) bimetal manganese indium oxysulfide (MnInOS) with rich S vacancies was designed and synthesized for the first time by introducing S elements into the synthesized InMnO 3, and its photocatalytic applications were demonstrated. Photocatalytic hydrogen evolution from pure water was successfully achieved by employing MnInOS as a difunctional photocatalyst in the absence of any electron sacrificial agents, as well as oxygen evolution. The MnInOS catalysts show enhanced photocatalytic hydrogen evolution (HER) reactivity and well stability, among which the HER rate of MnInOS-3 in pure water reaches 62 µmol g −1 h −1, while no hydrogen evolution was observed under the same conditions for pure InMnO 3 and MnIn 2S 4. Moreover, the oxygen evolution rate reached 649 µmol g −1 h −1 in the presence of AgNO 3 as the electron-sacrificial agents. The characterizations reveal that the formation of oxysulfide and the presence of S-vacancies enhance the light absorption capacity, and facilitates the separation and migration of photo-generated carriers. It is hoped that this study will provide novel insights into the design and development of efficient and stable metal sulfides photocatalysts for water splitting.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors · 2D Materials and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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