Self-Supported FeP-CoMoP Hierarchical Nanostructures for Efficient Hydrogen Evolution
Self-Supported FeP-CoMoP Hierarchical Nanostructures for Efficient Hydrogen Evolution
复制标题
用于高效析氢的自支撑 FeP-CoMoP 分层纳米结构
DOI：
10.1002/asia.202000278
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yu Chen
中科院分区：
文献类型：
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作者：
Qin Wang;Zhiying Wang;Yue Zhao;Fumin Li;Ling Xu;Xiaoming Wang;Huan Jiao;Yu Chen
制备高效的电化学制氢电催化剂是缓解全球能源危机和环境污染的当务之急。在此，一个合理的合成策略，开发用于构建良好定义的FeP-CoMoP分级纳米结构（HNS）。一般来说，自支撑的Co纳米棒（NR）生长在导电碳布上，并直接用作自我牺牲模板。在溶剂热处理后，Co NR被转化为有序的Co−Mo纳米管（NT）。随后，小尺寸的Fe羟基氧化物纳米棒阵列在Co-Mo NT表面上水热生长以形成Fe-Co-Mo HNS，然后通过简单的磷化处理将其转化为FeP-CoMoP HNS。FeP−CoMoP HNS显示出高的析氢反应活性（HER），在10 mA cm− 2时阴极过电位为33 mV，塔菲尔斜率为51 mV dec−1。 此外，FeP-CoMoP HNS在碱性介质中也具有优异的电化学耐久性。第一性原理密度泛函理论（DFT）计算表明，FeP−CoMoP HNS的显着HER活性源于FeP和CoMoP之间的协同效应。
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−2and 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.