Electrocatalytic hydrogen evolution reaction by water splitting is deemed to a clean and efficient approach for greener energy. The intensive pursuit of cost-effective and stable electrocatalysts for HER is quite imperative and challenging. Herein, a typical core-shell NiWO₄@NiCoO_xS_y/NCF nano-architecture consisted of NiCoO_xS_y/NCF octahedrons and NiWO₄ nanoparticles on nickel-cobalt foam is synthesized, and the NiWO₄@NiCoO_xS_y/NCF requires quite small overpotential of 85 mV to afford current density of 10 mA cm⁻² for HER in 1 M KOH, respectively, while NiCoO_xS_y/NCF shows the overpotential of 132 mV at the current density of 10 mA cm⁻² in 0.5 M H₂SO₄. Moreover, they still present good durability with continuous operation of 72 h in alkaline and acidic electrolytes, outperforming most of the non-noble bimetallic oxides or sulfides electrocatalysts. The prominent performance benefits from NiWO₄@NiCoO_xS_y/NCF takes advantages of component respective strengths such as interfacial cooperative effect, strong electrical connection and fast electron transfer, the highly exposed surface area, in situ surface reconstruction. The work provides a new prospect toward the controlled design and rational fabrication of multicomponent hierarchical core-shell structure electrocatalyst in high-performance flexible electrochemical hydrogen production.

通过水分解的电催化析氢反应被认为是一种清洁高效的绿色能源方法。强烈追求具有成本效益和稳定的 HER 电催化剂是非常必要和具有挑战性的。在此，在镍钴泡沫上合成了典型的由 NiCoO _x S _y /NCF 八面体和 NiWO ₄纳米粒子组成的核壳 NiWO ₄ @NiCoO _x S _y /NCF 纳米结构，NiWO ₄ @NiCoO _x S _y / NCF 需要非常小的 85 mV 过电势才能为 1 M KOH 中的 HER 提供 10 mA cm ^-2的电流密度，而 NiCoO _xS _y /NCF 显示在 0.5 MH ₂ SO _{4中在 10 mA cm} ^-2的电流密度下的过电势为 132 mV 。此外，它们在碱性和酸性电解质中连续运行 72 小时后仍具有良好的耐久性，优于大多数非贵金属双金属氧化物或硫化物电催化剂。NiWO ₄ @NiCoO _x S _y /NCF 的显着性能优势利用了组件各自的优势，例如界面协同效应、强电连接和快速电子转移、高暴露表面积、原位表面重建。该工作为高性能柔性电化学制氢中多组分分级核壳结构电催化剂的可控设计和合理制备提供了新的前景。