Fabricating highly efficient electrocatalysts for electrochemical hydrogen generation is a top priority to relief the global energy crisis and environmental contamination. Herein, a rational synthetic strategy is developed for constructing well-defined FeP-CoMoP hierarchical nanostructures (HNSs). In general terms, the self-supported Co nanorods (NRs) are grown on conductive carbon cloth and directly serve as a self-sacrificing template. After solvothermal treatment, Co NRs are converted into well-ordered Co-Mo nanotubes (NTs). Subsequently, the small-sized Fe oxyhydroxide nanorods arrays are hydrothermally grown on the surface of Co-Mo NTs to form Fe-Co-Mo HNSs, which are then converted into FeP-CoMoP HNSs through a facile phosphorization treatment. FeP-CoMoP HNSs display high activity for hydrogen evolution reaction (HER) with an ultralow cathodic overpotential of 33 mV at 10 mA cm-2 and a Tafel slope of 51 mV dec-1 . Moreover, FeP-CoMoP HNSs also possess an excellent electrochemical durability in alkaline media. First-principles density functional theory (DFT) calculations demonstrate that the remarkable HER activitiy of FeP-CoMoP HNSs originates from the synergistic effect between FeP and CoMoP.

中文翻译：

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自支撑的FeP-CoMoP分层纳米结构，可有效释放氢气。

制备用于电化学制氢的高效电催化剂是缓解全球能源危机和环境污染的重中之重。本文中，开发了一种合理的合成策略，用于构建定义明确的FeP-CoMoP分层纳米结构（HNSs）。一般而言，自支撑的Co纳米棒（NRs）在导电碳布上生长，并直接用作自牺牲模板。溶剂热处理后，Co NRs转化为有序的Co-Mo纳米管（NTs）。随后，将小尺寸的羟基氧化氢氧化铁纳米棒阵列在Co-Mo NTs的表面进行水热生长以形成Fe-Co-Mo HNS，然后通过简便的磷化处理将其转化为FeP-CoMoP HNS。FeP-CoMoP HNS对氢释放反应（HER）表现出高活性，在10 mA cm-2处的超低阴极超电势为33 mV，Tafel斜率为51 mV dec-1。此外，FeP-CoMoP HNS在碱性介质中也具有出色的电化学耐久性。第一性原理密度泛函理论（DFT）的计算表明，FeP-CoMoP HNS的非凡的HER活性源自FeP和CoMoP之间的协同作用。