Liu Jiawen, Yang Ying, Lin Weihuang, Wang Weijia, Xiao Si, Guo Xueyi, Zhu Congtan, Zhang Lin
School of Metallurgy and Environment, Central South University, Changsha 410083, China; Research Institute of Resource Recycling, Central South University, Changsha 410083, China.
School of Metallurgy and Environment, Central South University, Changsha 410083, China; Research Institute of Resource Recycling, Central South University, Changsha 410083, China.
J Colloid Interface Sci. 2024 Oct 15;672:744-752. doi: 10.1016/j.jcis.2024.06.030. Epub 2024 Jun 6.
Incorporating precise morphology control and efficient carrier separation into single-nanoparticle heterojunctions to achieve high photocatalytic efficiency remains a significant challenge. Here, we synthesized CuS-ZnS-CdS ternary heteronanoplates (HNPs) with a continuous sublattice structure using cation exchange reactions. Femtosecond transient absorption spectroscopy (TAS) confirms that ternary heterojunction enhances carrier separation efficiency, demonstrating both rapid separation (∼0.2 ps) and an extended lifetime (∼1512 ps). The synergistic combination results in a significantly enhanced hydrogen evolution rate of 2.012 mmol·g·h, which is 17 times and 183 times higher than that achieved by pure CdS and ZnS, respectively. Furthermore, there is no significant decrease in the activity of CuS-ZnS-CdS in photocatalytic hydrogen evolution after 288 days of placement. Our work offers an alternative approach for designing noble-metal-free photocatalysts with precisely defined materials and interfaces, aiming to enhance both photocatalytic hydrogen evolution efficiency and stability.
将精确的形貌控制和高效的载流子分离整合到单纳米颗粒异质结中以实现高光催化效率仍然是一项重大挑战。在此，我们通过阳离子交换反应合成了具有连续亚晶格结构的CuS-ZnS-CdS三元异质纳米片（HNP）。飞秒瞬态吸收光谱（TAS）证实三元异质结提高了载流子分离效率，显示出快速分离（约0.2皮秒）和延长的寿命（约1512皮秒）。这种协同组合导致析氢速率显著提高，达到2.012 mmol·g·h，分别比纯CdS和ZnS实现的析氢速率高17倍和183倍。此外，放置288天后，CuS-ZnS-CdS在光催化析氢中的活性没有显著下降。我们的工作为设计具有精确确定的材料和界面的无贵金属光催化剂提供了一种替代方法，旨在提高光催化析氢效率和稳定性。
