Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (8): 1717.doi: 10.7503/cjcu20180492

• Physical Chemistry • Previous Articles     Next Articles

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).

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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