Template-synthesis and electrochemical properties of urchin-like NiCoP electrocatalyst for hydrogen evolution reaction
Template-synthesis and electrochemical properties of urchin-like NiCoP electrocatalyst for hydrogen evolution reaction
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DOI：
10.1016/j.electacta.2017.08.036
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发表时间：
2017-09
影响因子：
6.6
通讯作者：
Yapeng Li;Zhigang Jiang;Junlin Huang;Xiaohua Zhang;Jinhua Chen
中科院分区：
文献类型：
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作者：
Yapeng Li;Zhigang Jiang;Junlin Huang;Xiaohua Zhang;Jinhua Chen
在这里，我们报道了一种模板参与的策略来制备海胆状三元金属磷化物(Ni0.5Co0.5P-300)作为析氢反应的催化剂。用扫描电子显微镜、透射电子显微镜、X射线衍射仪、X射线光电子能谱、微孔和化学吸附分析仪对Ni0.5Co0.5P-300及其前驱体的形貌和微观结构进行了分析。采用线性扫描伏安法、循环伏安法、计时电流法、计时电位法和交流阻抗法等典型的电化学方法对其在标准三电极体系上的电化学性质进行了表征。结果表明，所研制的多孔分级3DNi0.5Co0.5P-300催化剂在碱性水溶液中具有良好的析氢电催化活性，在负载质量为0.28mA/cm−2时，起始过电位为26 mV，塔菲尔斜率为58 mV，仅需87 mV即可达到10 mA/cm−2的电流密度，并可保持电流密度几乎不变的25 h安培测试。同时，Ni0.5Co0.5P-300催化剂在1MPBS溶液(pH=17.0)中也表现出良好的析氢电催化性能。这表明，Ni0.5Co0.5P-300催化剂具有海胆状结构、双金属优点、成本低等特点，在实际应用中可能是一种很好的电催化剂候选材料。
Herein, we report a template-engaged strategy to fabricate urchin-like ternary metal phosphide (Ni0.5Co0.5P-300) as catalyst for hydrogen evolution reaction. The morphology and microstructure of Ni0.5Co0.5P-300 and its precursors were examined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and micropore and chemisorption analyzer. Electrochemical properties were characterized by typical electrochemical methods, such as linear sweep voltammetry, cyclic voltammetry, chronoamperometry, chronopotentiometry and electrochemical impedance spectroscopy on a standard three-electrode system. Results show that the developed porous hierarchical 3D Ni0.5Co0.5P-300 catalyst has excellent electrocatalytic activity for hydrogen evolution in alkaline aqueous solution with onset overpotential of 26 mV and Tafel slope of 58 mV at the loading mass of 0.28 mg cm−2. It only needs 87 mV to reach the current density of 10 mA cm−2and can hold the nearly unchanged current density for 25 h amperometric test. Meanwhile, the Ni0.5Co0.5P-300 catalyst also exhibits good electrocatalytic properties for hydrogen evolution in 1 M PBS solution (pH = 7). These indicate that the Ni0.5Co0.5P-300 catalyst with urchin-like structure, bimetallic merit, and low cost may be a good candidate as electrocatalyst in practical application of hydrogen evolution.