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Heterostructured V-Doped Ni2P/Ni12P5 Electrocatalysts for Hydrogen Evolution in Anion Exchange Membrane Water Electrolyzers
Small ( IF 13.0 ) Pub Date : 2022-09-04 , DOI: 10.1002/smll.202204758 Tingwen Zhao 1 , Shuhao Wang 1 , Yibing Li 1, 2 , Chen Jia 1 , Zhen Su 1 , Derek Hao 3 , Bing-Jie Ni 3 , Qiang Zhang 4 , Chuan Zhao 1
Small ( IF 13.0 ) Pub Date : 2022-09-04 , DOI: 10.1002/smll.202204758 Tingwen Zhao 1 , Shuhao Wang 1 , Yibing Li 1, 2 , Chen Jia 1 , Zhen Su 1 , Derek Hao 3 , Bing-Jie Ni 3 , Qiang Zhang 4 , Chuan Zhao 1
Affiliation
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Regulating the electronic structure and intrinsic activity of catalysts’ active sites with optimal hydrogen intermediates adsorption is crucial to enhancing the hydrogen evolution reaction (HER) in alkaline media. Herein, a heterostructured V-doped Ni2P/Ni12P5 (V–Ni2P/Ni12P5) electrocatalyst is fabricated through a hydrothermal treatment and controllable phosphidation process. In comparison with pure-phase V–Ni2P, in/ex situ characterizations and theoretical calculations reveal a redistribution of electrons and active sites in V–Ni2P/Ni12P5 due to the V doping and heterointerfaces effect. The strong coupling between Ni2P and Ni12P5 at the interface leads to an increased electron density at interfacial Ni sites while depleting at P sites, with V-doping further promoting the electron accumulation at Ni sites. This is accompanied by the change of active sites from the anionic P sites to the interfacial Ni–V bridge sites in V–Ni2P/Ni12P5. Benefiting from the interface electronic structure, increased number of active sites, and optimized H-adsorption energy, the V-Ni2P/Ni12P5 exhibits an overpotential of 62 mV to deliver 10 mA cm–2 and excellent long-term stability for HER. The V–Ni2P/Ni12P5 catalyst is applied for anion exchange membrane water electrolysis to deliver superior performance with a current density of 500 mA cm–2 at a cell voltage of 1.79 V and excellent durability.
中文翻译：
用于阴离子交换膜水电解槽中析氢的异质 V 型掺杂 Ni2P/Ni12P5 电催化剂
通过优化氢中间体吸附来调节催化剂活性位点的电子结构和本征活性对于增强碱性介质中的析氢反应 (HER) 至关重要。在此，通过水热处理和可控磷化工艺制备了异质结构的V掺杂Ni 2 P/Ni 12 P 5 (V-Ni 2 P/Ni 12 P 5 )电催化剂。与纯相 V-Ni 2 P 相比，原位/非原位表征和理论计算揭示了 V-Ni 2 P/Ni 12 P 5中电子和活性位点的重新分布由于 V 掺杂和异质界面效应。Ni 2 P 和 Ni 12 P 5在界面处的强耦合导致界面 Ni 位点的电子密度增加，而 P 位点耗尽，V 掺杂进一步促进了 Ni 位点的电子积累。这伴随着活性位点从阴离子 P 位点到 V-Ni 2 P/Ni 12 P 5中的界面 Ni-V 桥位点的变化。得益于界面电子结构、增加的活性位点数量和优化的 H 吸附能量，V-Ni 2 P/Ni 12 P 5的过电位为 62 mV，可提供 10 mA cm –2以及对 HER 具有出色的长期稳定性。V-Ni 2 P/Ni 12 P 5催化剂应用于阴离子交换膜水电解，在1.79 V的电池电压下具有500 mA cm -2的电流密度和出色的耐用性。
更新日期：2022-09-04
中文翻译：
用于阴离子交换膜水电解槽中析氢的异质 V 型掺杂 Ni2P/Ni12P5 电催化剂
通过优化氢中间体吸附来调节催化剂活性位点的电子结构和本征活性对于增强碱性介质中的析氢反应 (HER) 至关重要。在此，通过水热处理和可控磷化工艺制备了异质结构的V掺杂Ni 2 P/Ni 12 P 5 (V-Ni 2 P/Ni 12 P 5 )电催化剂。与纯相 V-Ni 2 P 相比，原位/非原位表征和理论计算揭示了 V-Ni 2 P/Ni 12 P 5中电子和活性位点的重新分布由于 V 掺杂和异质界面效应。Ni 2 P 和 Ni 12 P 5在界面处的强耦合导致界面 Ni 位点的电子密度增加，而 P 位点耗尽，V 掺杂进一步促进了 Ni 位点的电子积累。这伴随着活性位点从阴离子 P 位点到 V-Ni 2 P/Ni 12 P 5中的界面 Ni-V 桥位点的变化。得益于界面电子结构、增加的活性位点数量和优化的 H 吸附能量，V-Ni 2 P/Ni 12 P 5的过电位为 62 mV，可提供 10 mA cm –2以及对 HER 具有出色的长期稳定性。V-Ni 2 P/Ni 12 P 5催化剂应用于阴离子交换膜水电解，在1.79 V的电池电压下具有500 mA cm -2的电流密度和出色的耐用性。
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