Abstract Tailoring the nonprecious nickel selenide heterogeneous electrocatalysts with controllable morphology and electronic structures is of prime importance to enhance the catalytic efficiency for hydrogen production evolution (HER). Here, we report the solvothermal in-situ synthesis of vanadium-incorporated NiSe/Ni3Se2 heterogeneous structures (VNS) on porous nickel foam, which function as an efficient electrode toward HER, together with superior catalytic activity and durability. Impressively, the self-assembled VNS electrode delivers the current densities of 100, 500 and 1000 mA cm−2 at quite low overpotentials of 175, 275 and 348 mV with 85% iR-compensation toward HER in 1.0 M KOH solution. Mott-Schottky analysis indicates that the vanadium doping alters the flat band potential of VNS, and in turn affects the electrons migration behavior at electrode and electrolyte interface. Benefiting from its dramatically increased catalytic active sites exposure, enhanced charge transport capability, and optimized electronic structure, the hierarchical VNS heterostructures exhibit an impressive HER electrocatalytic performance in alkaline media. More broadly, this research provides a promising strategy for design and exploitation of more advanced electrocatalysts for large-scale hydrogen production on selenides using heteroatom vanadium incorporation.

中文翻译：

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用钒掺杂调节自组装 NiSe/Ni3Se2 异质结构的形态和电子结构以实现高效的电催化制氢

摘要 定制具有可控形貌和电子结构的非贵重硒化镍多相电催化剂对于提高产氢析出（HER）的催化效率至关重要。在这里，我们报告了在多孔镍泡沫上溶剂热原位合成掺钒的 NiSe/Ni3Se2 异质结构（VNS），其作为高效的 HER 电极，具有优异的催化活性和耐久性。令人印象深刻的是，自组装的 VNS 电极在 175、275 和 348 mV 的极低过电位下提供了 100、500 和 1000 mA cm-2 的电流密度，在 1.0 M KOH 溶液中对 HER 进行了 85% 的 iR 补偿。Mott-Schottky 分析表明钒掺杂改变了 VNS 的平带电位，进而影响电极和电解质界面处的电子迁移行为。得益于其显着增加的催化活性位点暴露、增强的电荷传输能力和优化的电子结构，分层 VNS 异质结构在碱性介质中表现出令人印象深刻的 HER 电催化性能。更广泛地说，这项研究为设计和开发更先进的电催化剂提供了一种有前景的策略，用于使用杂原子钒掺入在硒化物上大规模生产氢气。分级 VNS 异质结构在碱性介质中表现出令人印象深刻的 HER 电催化性能。更广泛地说，这项研究为设计和开发更先进的电催化剂提供了一种有前景的策略，用于使用杂原子钒掺入在硒化物上大规模生产氢气。分级 VNS 异质结构在碱性介质中表现出令人印象深刻的 HER 电催化性能。更广泛地说，这项研究为设计和开发更先进的电催化剂提供了一种有前景的策略，用于使用杂原子钒掺入在硒化物上大规模生产氢气。