Issue 19, 2023

Activating self-supported NiPd electrodes by laser-direct-writing for efficient hydrogen evolution reaction

Abstract

Pd-based catalytic electrodes for the hydrogen evolution reaction (HER) are promising as a replacement of Pt-based catalysts, but their strong hydrogen adsorption hinders hydrogen desorption and thus limits HER catalytic activity. Here, we report a function–structure integrated D-Ni3.5Pd/NF catalytic electrode with a very low Pd loading (0.19 mgPd cm−2) and a large number of edge dislocations, which was prepared by millisecond laser direct writing in liquid nitrogen. The plentiful dislocations induce a strain effect leading to reduced hydrogen adsorption energies of Pd sites and enhanced water dissociation ability of Ni sites. Thereby, the dense dislocations improve the alkaline HER intrinsic activity and electrochemical stability of D-Ni3.5Pd/NF under high current densities. The as-prepared electrodes can achieve fairly low overpotentials of 35 and 352 mV at 10 mA cm−2 and 1 A cm−2 in a 1 M KOH electrolyte, respectively, while the Tafel slope is only 62.3 mV dec−1. In addition, its overpotential only increases by 4.2% after 100 h of the chronoamperometric test at 500 mA cm−2, showing an outstanding electrochemical stability at high current densities.

Graphical abstract: Activating self-supported NiPd electrodes by laser-direct-writing for efficient hydrogen evolution reaction

Supplementary files

Article information

Article type
Research Article
Submitted
23 Apr 2023
Accepted
09 Jul 2023
First published
11 Jul 2023

Mater. Chem. Front., 2023,7, 4508-4517

Activating self-supported NiPd electrodes by laser-direct-writing for efficient hydrogen evolution reaction

Z. Zhou, L. Xiao, J. Zhao, M. Zhou, J. Zhang, X. Du and J. Yang, Mater. Chem. Front., 2023, 7, 4508 DOI: 10.1039/D3QM00439B

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