Constructing well‐defined active multisites is an effective strategy to break linear scaling relationships to develop high‐efficiency catalysts toward multiple‐intermediate reactions. Here, dual‐intermetallic heterostructure composed of tungsten‐bridged Co3W and WNi4 intermetallic compounds seamlessly integrated on hierarchical nanoporous nickel skeleton is reported as a high‐performance nonprecious electrocatalyst for alkaline hydrogen evolution and oxidation reactions. By virtue of interfacial tungsten atoms configuring contiguous multisites with proper adsorptions of hydrogen and hydroxyl intermediates to accelerate water dissociation/combination and column‐nanostructured nickel skeleton facilitating electron and ion/molecule transportations, nanoporous nickel‐supported Co3W–WNi4 heterostructure exhibits exceptional hydrogen electrocatalysis in alkaline media, with outstanding durability and impressive catalytic activities for hydrogen oxidation reaction (geometric exchange current density of ≈6.62 mA cm−2) and hydrogen evolution reaction (current density of ≈1.45 A cm−2 at overpotential of 200 mV). Such atom‐ordered intermetallic heterostructure alternative to platinum group metals shows genuine potential for hydrogen production and utilization in hydroxide‐exchange‐membrane water electrolyzers and fuel cells.

中文翻译：

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多级纳米多孔金属上的双金属间异质结构用于高效碱性氢电催化


构建明确的活性多位点是打破线性比例关系以开发针对多个中间反应的高效催化剂的有效策略。在这里，由钨桥联的Co3W和WNi4金属间化合物组成的双金属间异质结构无缝集成在分级纳米多孔镍骨架上，被报道为一种用于碱性析氢和氧化反应的高性能非贵金属电催化剂。凭借界面钨原子配置连续的多位点，适当吸附氢和羟基中间体来加速水的解离/结合，以及柱状纳米结构镍骨架促进电子和离子/分子传输，纳米多孔镍负载的Co3W-WNi4异质结构在氢电催化中表现出优异的性能。碱性介质，具有出色的耐用性和令人印象深刻的催化活性，适用于氢氧化反应（几何交换电流密度约为 6.62 mA cm−2）和析氢反应（过电势为 200 mV 时电流密度约为 1.45 A cm−2）。这种替代铂族金属的原子有序金属间异质结构显示出在氢氧化物交换膜水电解槽和燃料电池中生产和利用氢气的真正潜力。