School of Chemistry, The University of New South Wales, Sydney, NSW, 2052, Australia.
Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
Small. 2023 Jul;19(27):e2208076. doi: 10.1002/smll.202208076. Epub 2023 Mar 27.
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-Ni P) is developed to regulate the intrinsic electronic configuration of Ni P and promote HER processes. Experimental and theoretical results reveal that V dopants in B, V-Ni P 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-Ni P electrocatalyst requires a low overpotential of 148 mV to attain a current density of -100 mA cm with excellent durability. The B, V-Ni P 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 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.
开发低成本、高性能的过渡金属基电催化剂对于实现碱性介质中可持续的析氢反应（HER）至关重要。在这里，开发了一种协同硼和钒共掺杂的镍磷电极（B、V-Ni P），以调节 Ni P 的本征电子结构并促进 HER 过程。实验和理论结果表明，B、V-Ni P 中的 V 掺杂剂极大地促进了水的解离，B 和 V 掺杂剂的协同效应促进了吸附氢中间体的随后脱附。受益于两种掺杂剂的协同作用，B、V-Ni P 电催化剂需要 148 mV 的低过电位即可达到 -100 mA cm 的电流密度，具有出色的耐久性。B、V-Ni P 用作碱性水电解槽（AWEs）和阴离子交换膜水电解槽（AEMWEs）的阴极。值得注意的是，AEMWE 可实现稳定的性能，在 1.78 和 1.92 V 的电池电压下分别达到 500 和 1000 mA cm 的电流密度。此外，所开发的 AWEs 和 AEMWEs 还在全海水电解中表现出优异的性能。
