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Wrinkled Ni-doped Mo2C coating on carbon fiber paper: An advanced electrocatalyst prepared by molten-salt method for hydrogen evolution reaction
Ist Teil von
Electrochimica acta, 2019-10, Vol.319, p.293-301
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Synthesis of affordable electrocatalysts with high efficiency at low cost is crucial for large-scale water splitting. Molybdenum carbide (Mo2C) has been suggested to be a promising alternative to noble metal based electrocatalysts for water splitting. In this paper, we fabricated a nanotextured coating of wrinkled Ni-doped Mo2C on carbon fiber paper (CFP) from Ni, Mo and carbon black (CB) via a molten salt method. Such a novel electrocatalyst, denoted as Ni-Mo2CCB/CFP, shows an overpotential of 121.4, 209.3 and 426.4 mV to achieve a current density of 10, 20 and 50 mA cm−2 respectively in acidic medium. The hydrogen evolution reaction (HER) performance of other as-prepared CFP based electrodes (bare CFP, Mo2C/CFP, Mo2CCB/CFP, Ni-Mo2C/CFP and NiCx/CFP) also tested. We found that the addition of carbon black and the doping of Ni could significantly improve the electrocatalytic performance of Mo2C/CFP in terms of overpotential, Tafel slope and exchange current density. This work demonstrates a facile and scalable route using molten salt method for the synthesis of high-performance electrocatalysts from non-precious compounds on carbon materials.
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•Carbon fiber paper (CFP) was employed as a carbon source and substrate of Mo2C.•The addition of carbon black (CB) contributes to the refinement of Mo2C particles.•Ni-Mo2C/CFP composite was prepared from Ni, Mo, CFP and CB by a molten salt method.•The Ni-Mo2C/CFP electrocatalyst exhibits excellent catalytic performance for HER.