科研之友
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摘要
Accelerating the photogenerated carrier separation of semiconductor photocatalysts is still a big challenge to developing highly effective hydrogen evolution reaction (HER) systems. Here, a novel ternary photocatalytic system of Cu2ZnSnS4 nanocrystals/Ag clusters/conducting polyaniline (CZTS/Ag/PANI) was successfully synthesized via a facile solvothermal and hydrothermal method for the first time. PANI, serving as the support, efficiently prevents the aggregating of the Cu2ZnSnS4 and Ag clusters, so CZTS nanocrystals (30-50 nm) and Ag clusters (2-5 nm) disperse equally in macromolecule PANI. PANI with an extended pi-conjugated electron system and Ag clusters with a plasmon resonance effect are used as sensitizers/cocatalysts to enhance the light absorption and electrical conductivity and excite the separation of photogenerated electron and hole pairs. As expected, the CZTS/Ag/PANI heterostructured photocatalyst exhibits significantly enhanced photocatalytic activity for hydrogen evolution from water splitting in the presence of visible light. The optimal hydrogen evolution rate over CZTS/Ag/PANI with the apparent quantum yield (AQE) similar to 30.5% at 450 nm is 859.6 mu mol h(-1), which is also higher than previously reported for CZTS-based photocatalysts. Recycling experiments confirm that the CZTS/Ag/PANI composite exhibits remarkably stable photocatalytic performance and can be reused in four successive cycles. This research indicates that the application of Ag nanoclusters and the PANI semiconductor as a cocatalyst can provide a new approach to designing and synthesizing stable and high efficiency CZTS-based visible-light-induced photocatalysts.
- 出版日期2018-9
- 单位东华大学
