开发高效、稳定的电催化剂用于电化学水分解制氢至关重要.通过合金化和脱合金化法制备了纳米多孔NiFeCoTi高熵合金电极,并对其碱性析氢反应性能进行了研究.结果表明:该电极具有柱状纳米多孔结构,能够促进电催化反应过程中的电子传递和质量运输,表面的NiFeCoTi高熵合金可以提供双功能的电催化活性位点,促进水的解离和氢中间体的吸附/结合.在1 M KOH电解液中,纳米多孔NiFeCoTi电极在～111 mV的过电位下就能够达到400 mA/cm2的电流密度,具有较低的Tafel斜率和优异的长期稳定性.
Hydrogen evolution reaction performance of nanoporous NiFeCoTi high-entropy alloy electrode
Developing efficient and stable electrocatalysts towards hydrogen evolution reaction is crucial for electrochemical water splitting to produce hydrogen.Nanoporous NiFeCoTi high-entropy alloy electrode was prepared by alloying and dealloying strategies,and its alkaline hydrogen evolution reaction performance was studied.The results show that the electrode has a columnar nanoporous structure,which can promote electron transfer and mass transport during the electrocatalytic reaction process.The surface NiFeCoTi high-entropy alloy can provide bifunctional electrocatalytic active sites,promoting water dissociation and adsorption/combination of hydrogen intermediates.In 1 M KOH electrolyte,the nanoporous NiFeCoTi electrode can achieve a current density of 400 mA/cm2 at a low overpotential of about 111 mV,with a low Tafel slope and excellent long-term stability.
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