Cooperative Boron and Vanadium Doping of Nickel Phosphides for Hydrogen Evolution in Alkaline and Anion Exchange Membrane Water/Seawater Electrolyzers

Developing low‐cost and high‐performance transition metal‐based electrocatalysts is crucial for realizing sustainable hydrogen evolution reaction (HER) in alkaline media. Here, a cooperative boron and vanadium co‐doped nickel phosphide electrode (B, V‐Ni2P) is developed to regulate the intrinsic ele...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-07, Vol.19 (27), p.e2208076-n/a
Main Authors: Zhao, Tingwen, Wang, Shuhao, Jia, Chen, Rong, Chengli, Su, Zhen, Dastafkan, Kamran, Zhang, Qiang, Zhao, Chuan
Format: Article
Language:English
Subjects:
anion exchange membrane water electrolyzers
Anion exchanging
Boron
cooperative‐doping
Current density
Dopants
Electrocatalysts
Electrolysis
Hydrogen evolution reactions
Membranes
Nanotechnology
Nickel
nickel phosphides
Phosphides
Seawater
Synergistic effect
Transition metals
Vanadium
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Summary:Developing low‐cost and high‐performance transition metal‐based electrocatalysts is crucial for realizing sustainable hydrogen evolution reaction (HER) in alkaline media. Here, a cooperative boron and vanadium co‐doped nickel phosphide electrode (B, V‐Ni2P) is developed to regulate the intrinsic electronic configuration of Ni2P and promote HER processes. Experimental and theoretical results reveal that V dopants in B, V‐Ni2P greatly facilitate the dissociation of water, and the synergistic effect of B and V dopants promotes the subsequent desorption of the adsorbed hydrogen intermediates. Benefiting from the cooperativity of both dopants, the B, V‐Ni2P electrocatalyst requires a low overpotential of 148 mV to attain a current density of −100 mA cm−2 with excellent durability. The B, V‐Ni2P is applied as the cathode in both alkaline water electrolyzers (AWEs) and anion exchange membrane water electrolyzers (AEMWEs). Remarkably, the AEMWE delivers a stable performance to achieve 500 and 1000 mA cm−2 current densities at a cell voltage of 1.78 and 1.92 V, respectively. Furthermore, the developed AWEs and AEMWEs also demonstrate excellent performance for overall seawater electrolysis. Cooperative boron and vanadium doping of nickel phosphides (B, V‐Ni2P) demonstrate excellent catalytic activity and stability for hydrogen evolution reaction in alkaline and anion exchange membrane water/seawater electrolyzers, thanks to the acceleration of water dissociation and desorption of hydrogen intermediates.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202208076