Boosting the hydrogen evolution of layered double hydroxide by optimizing the electronic structure and accelerating the water dissociation kinetics

作者：He, Hongbo; Xiao, Jiayong; Liu, Zhibin^*; Yang, Bin; Wang, Dashuai; Peng, Xianyun; Zeng, Libin; Li, Zhongjian; Lei, Lecheng; Qiu, Ming^*; Hou, Yang^*

来源：Chemical Engineering Journal, 2023, 453: 139751.

DOI：10.1016/j.cej.2022.139751

• Layered double hydroxide
• Hydrogen evolution reaction
• Zn-H 2 O cell
• Electronic structure
• Water dissociation kinetic

Designing a highly efficient and durable electrocatalyst for hydrogen evolution reactions (HER) is of great significance to promote the development of green hydrogen energy. This work reports a vertical-aligned electrocatalyst of Cu2O/CoCu-LDH inlaid bilayer nanosheets that achieve excellent alkaline HER performance with a low overpotential of 96 mV at 10 mA cm-2 and a low Tafel slope of 76.8 mV dec- 1. Notably, Cu2O/CoCu-LDH outperforms Pt/C at a practical current density of 600 mA cm-2. The structural characterizations and theory calculations revealed that the superior HER activity of Cu2O/CoCu-LDH is due to the distinctive morphology, optimized electronic structure and accelerated water dissociation kinetics. Remarkably, the Cu2O/CoCu-LDH acted as the cathode in alkaline Zn-H2O cell demonstrating the potential applications for H2 generation and electricity energy simultaneously. Our work can guide the design of LDH-based electrocatalysts with outstanding HER performance.

• 单位
  y; 浙江大学