Qin Minkai, Qi Menghui, Fan Ruxue, Chen Jiadong, Shi Xiaoyun, Lin Binbin, Xi Lingling, Wang Yong
Advanced Materials and Catalysis Group, Center of Chemistry for Frontier Technologies, State Key Laboratory of Clean Energy Utilization, Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou, 310028, P. R. China.
College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Precis Chem. 2023 Jul 10;1(8):497-506. doi: 10.1021/prechem.3c00033. eCollection 2023 Oct 23.
2D transition metal disulfides have emerged as promising Pt-alternative electrocatalysts for hydrogen generation. However, the sluggish water dissociation kinetics and limited active sites hinder their performance in alkaline media. Herein, we propose a two-step hydrothermal method to synthesize K intercalation-assisted Co-doped MoS nanoflowers. These nanoflowers exhibit an overpotential of only 67 mV at a current density of 10 mA cm, which exceeds that of pristine MoS (143 mV). We demonstrated that the intercalation of K enlarges the interlayer spacing of MoS nanosheets and facilitates the doping of Co. The incorporation of Co effectively improves the surface charge transfer efficiency of MoS and accelerates water splitting with an energy barrier of 0.12 eV. This work offers an approach to activate the inert MoS basal plane by chemical intercalation and atomic doping coengineering. It can be extended to develop other functional materials beyond water splitting.
二维过渡金属二硫化物已成为有前景的替代铂的析氢电催化剂。然而，缓慢的水离解动力学和有限的活性位点阻碍了它们在碱性介质中的性能。在此，我们提出一种两步水热法来合成钾插层辅助的钴掺杂二硫化钼纳米花。这些纳米花在电流密度为10 mA cm时的过电位仅为67 mV，超过了原始二硫化钼的过电位（143 mV）。我们证明钾的插层扩大了二硫化钼纳米片的层间距并促进了钴的掺杂。钴的掺入有效地提高了二硫化钼的表面电荷转移效率，并以0.12 eV的能垒加速了水分解。这项工作提供了一种通过化学插层和原子掺杂协同工程来激活惰性二硫化钼基面的方法。它可以扩展到开发除水分解之外的其他功能材料。
