Self-standing Ni–Cu–Ti/NCNTs electrocatalyst with porous structure for hydrogen evolution reaction

Abstract

The development of water electrolysis hydrogen production technology is of great significance for accelerating the global carbon neutrality goals. Nickel-based electrode materials are considered the most promising catalysts for alkaline water electrolysis. However, the slow kinetics of the hydrogen evolution reaction remains a key challenge to be solved. To address this, a porous Ni–Cu–Ti/NCNTs cathode electrode was prepared using the powder metallurgy method. The microstructure characterizations and electrochemical measurements revealed that adjusting the content of NCNTs, while maintaining the Ni–Cu–Ti ratio of 5.5:3.5:1, can improve the catalytic activity of hydrogen evolution to a certain extent. Among the electrodes tested at room temperature, the one with 0.7% NCNT content exhibited the best performance in terms of hydrogen evolution. The analysis suggests that the porous structure of the electrode provides ample channels for object transmission. The addition of NCNTs further enhances the surface roughness of the electrode, exposing more active sites. Additionally, NCNTs promote electron transfer, synergize with Ni, Cu, and Ti, and improve the catalytic activity of hydrogen evolution.