Yao Shujuan, Wu Chuanrui, Li Danyang, Gao Bo, Wen Xiaoxu, Liu Ziyi, Li Wenzhi
School of Materials Science and Engineering, Liaocheng University, Shandong, 252059, China.
Dalton Trans. 2021 Apr 28;50(16):5530-5539. doi: 10.1039/d1dt00271f.
In order to harvest more light wavelengths to improve the light-assisted electrochemical water splitting capacity, we developed a novel heterostructure of three-dimensional (3D) flower-like CuS architecture with accompanying SnS2 nanoparticles and reduced graphene oxide (rGO) aerogel for outstanding light-assisted electrocatalytic OER performance and good stability. The excellent catalytic kinetics, effective capturing of visible light, and rapid charge transfer of the CuS/SnS2/rGO (CSr) heterostructure were demonstrated. The overpotential (264 mV@10 mA cm-2) under light-assisted conditions is 20% lower than that under light-chopped conditions. SnS2 can harvest more light wavelengths and this boosts its intrinsic activity. However, with the increase of the SnS2 content, the OER activity decreases. The combination of the CS heterostructure and the rGO conductive aerogel achieves rapid charge transfer. Furthermore, the possible mechanism of the light-assisted electrocatalytic OER was also proposed. Overall, this work provides new insights into the simple and scalable fabrication of a highly efficient, low-cost, and stable non-noble-metal-based electrocatalyst.
为了捕获更多光波长以提高光辅助电化学水分解能力，我们开发了一种新型的三维（3D）花状CuS结构与伴随的SnS2纳米颗粒和还原氧化石墨烯（rGO）气凝胶的异质结构，以实现出色的光辅助电催化析氧反应（OER）性能和良好的稳定性。证明了CuS/SnS2/rGO（CSr）异质结构具有优异的催化动力学、有效的可见光捕获和快速的电荷转移。光辅助条件下的过电位（264 mV@10 mA cm-2）比遮光条件下低20%。SnS2可以捕获更多光波长，这提高了其本征活性。然而，随着SnS2含量的增加，OER活性降低。CS异质结构与rGO导电气凝胶的结合实现了快速电荷转移。此外，还提出了光辅助电催化OER的可能机制。总体而言，这项工作为高效、低成本和稳定的非贵金属基电催化剂的简单且可扩展制备提供了新的见解。
