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Synthesis of Nickel Germanide (Ge12Ni19) Nanoparticles for Durable Hydrogen Evolution Reaction in Acid Solutions


Advanced materials as electrochemical catalysts for hydrogen evolution reaction (HER) have caught great attention owing to the growing demand in clean and renewable energy. Nickel (Ni) compounds and alloys are promising non-noble-metal electro catalysts due to their low cost and high activity. However, in most of cases, Ni compounds and alloys have low durability in acid electrolyte which limited the application in electrolytic processes. In this work, monoclinic Ge12Ni19 nanoparticles were synthesized and exhibited high electrocatalytic activity stability for HER in acidic solution. Ge12Ni19 nanoparticles achieve an overpotential voltage of 190 mV at a produced cathodic current density of 10 mA cm-2, and a Tafel slope of 88.5 mV per decade in 0.50 M H2SO4 electrolyte. Moreover, the performance remains still after a 10000-cycle CV sweep (-0.3 to +0.1 V vs. RHE) or under a static overpotential of -0.7 V vs. RHE for 24 hours. The reported electrocatalytic performance of the Ge12Ni19 nanoparticles sufficiently proves the marvelous endurance at lower required active overpotential in acid solution, making the applications of Ni-based electrocatalysts in more aspects. Finally, large-area (5 cm2) electrocatalyst for HER was demonstrated for the first time. The great efficiency of the energy conversion performance sufficiently represented the potential of Ge12Ni19 nanoparticles as electro catalyst in commercial fuel cells.

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Publication details

The article was received on 20 Dec 2017, accepted on 13 May 2018 and first published on 14 May 2018

Article type: Paper
DOI: 10.1039/C7NR09475B
Citation: Nanoscale, 2018, Accepted Manuscript
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    Synthesis of Nickel Germanide (Ge12Ni19) Nanoparticles for Durable Hydrogen Evolution Reaction in Acid Solutions

    J. Chen, S. Jheng and H. Tuan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR09475B

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