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Ag2S-Modified ZnIn2S4 Nanosheets for Photocatalytic H2 Generation
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-23 , DOI: 10.1021/acsanm.0c02240 Jingyuan Liu 1 , Gang Chen 1 , Jingxue Sun 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-23 , DOI: 10.1021/acsanm.0c02240 Jingyuan Liu 1 , Gang Chen 1 , Jingxue Sun 1
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Ag2S was successfully deposited on ZnIn2S4 (ZIS) nanosheets via a room temperature cation exchange reaction. The facile synthetic strategy allows Ag2S to easily form atomic-level intimate contact with ZIS nanosheets, which ensures efficient interfacial charge transfer. With the optimal deposition ratio (1.10 mol %), the hydrogen evolution rate of 25 mg Ag2S-modified ZIS nanosheets is 25.02 μmol h–1, which is 2.3 times higher than that of pristine one. It was also found that partial Ag2S was reduced to metallic Ag during the photocatalytic reaction. On the basis of the experimental results, the photocatalytic reduction mechanism was discussed. Under light irradiation, metallic Ag can rapidly capture photogenerated electrons from ZIS nanosheets and transfer electrons to the active sites on Ag2S. As a result, the synergistic effect of Ag2S and metallic Ag leads to a higher photocatalytic hydrogen evolution activity. This work offers an improved understanding of the reaction mechanism of cation exchange in ternary sulfide and provides an opportunity to develop a highly efficient photocatalyst using an Ag2S-based cocatalyst.
中文翻译：
Ag 2 S修饰的ZnIn 2 S 4纳米片用于光催化H 2的产生
通过室温阳离子交换反应，Ag 2 S成功地沉积在ZnIn 2 S 4（ZIS）纳米片上。简便的合成策略使Ag 2 S可以轻松地与ZIS纳米片形成原子级的紧密接触，从而确保有效的界面电荷转移。在最佳沉积比（1.10 mol％）下，25 mg Ag 2 S改性的ZIS纳米片的析氢速率为25.02μmolh –1，比原始的高2.3倍。还发现部分Ag 2在光催化反应期间，S被还原为金属Ag。在实验结果的基础上，探讨了光催化还原的机理。在光照射下，金属Ag可以迅速从ZIS纳米片中捕获光生电子，并将电子转移到Ag 2 S上的活性位。结果，Ag 2 S和金属Ag的协同作用导致更高的光催化氢释放活性。这项工作提供了对三元硫化物中阳离子交换反应机理的更好理解，并为使用Ag 2 S基助催化剂开发高效光催化剂提供了机会。
更新日期：2020-11-25
中文翻译：
Ag 2 S修饰的ZnIn 2 S 4纳米片用于光催化H 2的产生
通过室温阳离子交换反应，Ag 2 S成功地沉积在ZnIn 2 S 4（ZIS）纳米片上。简便的合成策略使Ag 2 S可以轻松地与ZIS纳米片形成原子级的紧密接触，从而确保有效的界面电荷转移。在最佳沉积比（1.10 mol％）下，25 mg Ag 2 S改性的ZIS纳米片的析氢速率为25.02μmolh –1，比原始的高2.3倍。还发现部分Ag 2在光催化反应期间，S被还原为金属Ag。在实验结果的基础上，探讨了光催化还原的机理。在光照射下，金属Ag可以迅速从ZIS纳米片中捕获光生电子，并将电子转移到Ag 2 S上的活性位。结果，Ag 2 S和金属Ag的协同作用导致更高的光催化氢释放活性。这项工作提供了对三元硫化物中阳离子交换反应机理的更好理解，并为使用Ag 2 S基助催化剂开发高效光催化剂提供了机会。
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