Characteristics of a sintered porous Ni-Cu alloy cathode for hydrogen production in a potassium hydroxide solution

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Linping Yu
  • Ting Lei
  • Bo Nan
  • Yao Jiang
  • Yuehui He

Detail(s)

Original languageEnglish
Pages (from-to)498-505
Journal / PublicationEnergy
Volume97
Publication statusPublished - 15 Feb 2016

Abstract

A porous Ni-Cu alloy with a most probable pore size of 2.4 μm and an open porosity over 31.5% was synthesized by step sintering pressed compacts consisted of mixed Ni and Cu powders in a vacuum furnace. The electrocatalytic activity and stability of the fabricated porous Ni-Cu alloy as cathode for the HER (hydrogen evolution reaction) in 6.0 mol/L potassium hydroxide solution were investigated by cathodic current-potential curves, CV (cyclic voltammetry) and EIS (electrochemical impedance spectroscopy) techniques. Results show that the onset potential of the porous Ni-Cu for HER greatly shifts to the positive direction compared with the dense Ni and dense Ni-Cu alloy. The electrochemical activation energy is determined to be 26.7 kJ mol-1 for the porous Ni-Cu alloy, against 44.1 kJ mol-1 and 32.6 kJ mol-1 for the dense Ni and dense Ni-Cu alloy, respectively. The increased activity of the porous Ni-Cu alloy for HER is related to the micro-porous structure as well as synergistic interaction of Ni and Cu. Besides, the fabricated porous Ni-Cu alloy displays good corrosion resistance in potassium hydroxide solution during the immersion test, which makes it possible for long-time running as cathode in the process of hydrogen evolution reaction.

Research Area(s)

  • Electrocatalytic activity, Hydrogen evolution reaction, Porous Ni-Cu alloy, Powder metallurgy, Stability

Citation Format(s)

Characteristics of a sintered porous Ni-Cu alloy cathode for hydrogen production in a potassium hydroxide solution. / Yu, Linping; Lei, Ting; Nan, Bo; Jiang, Yao; He, Yuehui; Liu, C. T.

In: Energy, Vol. 97, 15.02.2016, p. 498-505.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review