高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (8): 1717.doi: 10.7503/cjcu20180492

• 物理化学 • 上一篇    下一篇

Mo对脱合金制备的Ni-Mo电极骨架结构与析氢性能的影响

周琦, 李志洋, 汪帆   

  1. 兰州理工大学材料科学与工程学院, 省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050
  • 收稿日期:2018-07-09 修回日期:2019-07-23 出版日期:2019-08-10 发布日期:2019-07-12
  • 通讯作者: 周琦,女,教授,主要从事材料电化学研究.E-mail:zhouxq301@sina.com E-mail:zhouxq301@sina.com
  • 基金资助:
    国家自然科学基金(批准号:51661018)资助.

Effect of Mo on the Skeleton Structure and Hydrogen Evolution Performance of Ni-Mo Alloys Electrode Prepared by De-alloying

ZHOU Qi, LI Zhiyang, WANG Fan   

  1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, College of Materials and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2018-07-09 Revised:2019-07-23 Online:2019-08-10 Published:2019-07-12
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.51661018).

摘要: 采用快速凝固结合脱合金化方法制备了不同Mo含量的纳米多孔Ni-Mo合金,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和N2吸附-脱附分析等对多孔合金的物相、形貌结构及孔径分布进行了表征,并通过线性扫描伏安、Tafel斜率、交流阻抗和循环伏安等方法测试了多孔合金电极的电催化析氢性能.结果显示,多孔合金电极材料在50 mA/cm2电流密度下析氢过电位随着Mo含量的增加先降低后升高,Ni2.5Mo2.5合金析氢活性最强,过电位为218 mV,析氢过程由Volmer-Heyrovsky步骤控制,交换电流密度为0.29 mA/cm2,经1000周循环后的极化曲线基本保持原状,50 mA/cm2电流密度下过电位增加3.67%,表现出优良的析氢稳定性.

关键词: 快速凝固, 脱合金化, 多孔Ni-Mo合金, 电催化析氢

Abstract: Nanoporous Ni-Mo alloys with different Mo contents were prepared by rapid solidification and dealloying. The phase, morphology and pore size distribution of porous electrode materials were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and N2 adsorption-desorption analysis. The electrocatalytic hydrogen evolution of porous electrode was tested by linear sweep voltammetry, Tafel slope, alternate current impedance and cyclic voltammetry. The results show that the hydrogen evolution overpotential of the prepared porous electrode material decreases first and then increases with the increase of Mo content at a current density of 50 mA/cm2. The hydrogen evolution activity of Ni2.5Mo2.5 alloy is the highest, and the hydrogen evolution process on it is controlled by Volmer-Heyrovsky step. The apparent exchange current density of Ni2.5Mo2.5 alloy electrode is 0.29 mA/cm2. After 1000 cycles of cyclic voltammetry, the polarization curve remains basically the same, and over potential increased only by 3.67% under a current density of 50 mA/cm2, showing excellent hydrogen evolution stability.

Key words: Rapid quenching, De-alloying, Porous Ni-Mo alloy, Electrocatalytic hydrogen evolution

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