Issue 13, 2023

Rational nitrogen alloying in nickel–molybdenum nitride can mediate efficient and durable alkaline hydrogen evolution

Abstract

Water-alkali electrolysis for hydrogen production provides a feasible approach to relieve the energy crisis when combined with renewable electricity. Non-noble metal Ni–Mo alloy-based catalysts possess great potential to drive efficient alkaline hydrogen evolution reaction (HER); however, it suffers from weak stability due to the dealloying process. Here, we theoretically investigate the rational nitrogen alloying process in Ni–Mo nitrides to balance the activity and stability, while a moderate N ratio in Ni–Mo nitrides leads to a Volmer–Heyrovsky mechanism with a rapid water dissociation process. The synthesized metallic Ni2Mo3N electrode motivates an efficient alkaline HER process, exhibiting a low overpotential of 59.7 mV to achieve a current density of 10 mA cm−2 with a robust stability for 200 hours. In addition, the Ni2Mo3N electrocatalyst can be further used in an anion membrane flow cell for hydrogen production, reaching a high current density of 1.0 A cm−2 for over 50 h. We anticipate that this rational nitrogen alloying strategy can be adoptable for fabrication of efficient and durable electrodes for industry-scale alkaline water electrolysis.

Graphical abstract: Rational nitrogen alloying in nickel–molybdenum nitride can mediate efficient and durable alkaline hydrogen evolution

Supplementary files

Article information

Article type
Paper
Submitted
07 Sep 2022
Accepted
27 Feb 2023
First published
16 Mar 2023

J. Mater. Chem. A, 2023,11, 7256-7263

Rational nitrogen alloying in nickel–molybdenum nitride can mediate efficient and durable alkaline hydrogen evolution

J. Y. Zhao, Z. X. Lou, L. Y. Xue, Y. Ding, X. Li, X. Wu, Y. Liu, H. Y. Yuan, H. F. Wang, P. F. Liu, S. Dai and H. G. Yang, J. Mater. Chem. A, 2023, 11, 7256 DOI: 10.1039/D2TA07051K

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