Powder metallurgy synthesis of porous NiMo alloys as efficient electrocatalysts to enhance the hydrogen evolution reaction

• Published in: Journal of alloys and compounds 2021-06, Vol.865, p.158901, Article 158901
• Main Authors: Xu, J.L., Li, L.L., Tang, J., Dai, L., Li, X.B., Ye, Z.G., Luo, J.M.
• Format: Article
• Language: English
• Subjects: Alloys; Charge transfer; Electrocatalysts; Hydrogen evolution reaction; Hydrogen evolution reactions; Hydrogen-based energy; Intermetallic compounds; Microwave sintering; Molybdenum; Nickel; Porous NiMo alloy; Powder metallurgy; Sintering (powder metallurgy); Water splitting
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.158901

•Porous NiMo alloys were prepared by microwave sintering coupled with Mg space holder.•It has a low overpotential and a low Tafel slope.•NiMo phase can serve as active sites and reduce the charge transfer resistance.•After CV-activation, the Ni(OH)2 nanosheets can be formed. Electrochemical water splitting is considered to be one of the most potential strategies to achieve the hydrogen economy. In this paper, the porous NiMo alloys used as efficient electrocatalysts were designed and synthesized by microwave sintering powder metallurgy method. The as-prepared porous NiMo alloys as good electrocatalysts exhibit excellent hydrogen evolution reaction (HER) performance and outstanding durability in alkaline electrolyte (1.0 M KOH). Especially, the porous Ni6Mo4 alloy shows smaller overpotential of 37 mV at current density of 10 mA cm−2 and a low Tafel slope of 82.1 mV dec−1. The efficient electrocatalytic performance of Ni6Mo4 alloy can be attributed to the synergies of Ni, Mo and NiMo intermetallic compound, more active sites and quicker charge transfer rate.