Self-supported porous Ni-Fe-P composite as an efficient electrocatalyst for hydrogen evolution reaction in both acidic and alkaline medium
Self-supported porous Ni-Fe-P composite as an efficient electrocatalyst for hydrogen evolution reaction in both acidic and alkaline medium
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DOI：
10.1016/j.electacta.2016.10.004
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发表时间：
2016-11
影响因子：
6.6
通讯作者：
Zizai Ma;Ruixue Li;Mei Wang;H. Meng;Fei Zhang;Xiao-qing Bao;B. Tang;Xiaoguang Wang
中科院分区：
文献类型：
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作者：
Zizai Ma;Ruixue Li;Mei Wang;H. Meng;Fei Zhang;Xiao-qing Bao;B. Tang;Xiaoguang Wang
采用泡沫金属（Ni-Fe）与磷蒸气直接反应的方法制备了自支撑多孔Ni-Fe-P纳米复合阴极。微结构表征结果证实，在与P蒸气反应之后，包括Ni和Fe的金属骨架转化成相应的金属磷化物化合物（即，Ni 2 P、Ni 5 P4和Fe 2 P）和在韧带上垂直生长的纳米片阵列的量。在酸性（0.5 M H2SO 4）和碱性（1.0 M KOH）介质中，与纯Ni和Ni-Fe泡沫相比，所制备的Ni-Fe-P电极表现出相当高的HER催化性能，甚至接近最先进的Pt/C。这种典型的微纳三维结构与其上的纳米片阵列相结合的复合阴极具有良好的HER性能，不仅为电子传递提供了快速通道，而且提供了大的电化学表面积，从而暴露出更多的HER电催化活性位点。Ni 5 P4和Fe 2 P相也可能在所显示的上级HER活性中起关键作用。这些优异的结果预示着这种典型的多元Ni-Fe-P阴极在电化学水裂解大规模氢燃料生产中的潜在应用。
Self-supported porous Ni-Fe-P nanocomposite cathode was fabricated via a direct reaction between metallic foam (Ni-Fe) and P vapor. Microstructure characterization results confirm that, after the reaction with P vapor, the metallic framework including Ni and Fe was converted into corresponding metallic phosphide compounds (i.e., Ni2P, Ni5P4and Fe2P) and quantities of nanosheet arrays vertically-grown on the ligament. Both in acidic (0.5 M H2SO4) and alkaline (1.0 M KOH) media, the as-obtained Ni-Fe-P electrode demonstrates a quite high HER catalytic performance as compared with pristine Ni and Ni-Fe foam, even being almost close to state-of-the-art Pt/C. The as-evolved typical micro-nano hierarchical 3D integrated framework coupled with quantities of nanosheet arrays on it should be responsible for the great HER performance of this resulting composite cathode, which provides not only fast channels for electron transfer but also offers large electrochemical surface area so as to expose more active sites toward the electrocatalysis for HER. Meanwhile, the synergistic effect between the three active Ni2P, Ni5P4and Fe2P phase may also play a crucial role in the as-revealed superior HER activity. These excellent results promise the potential application of this typical kind of multi-component Ni-Fe-P cathode toward electrochemical water splitting for large-scale hydrogen fuel production.