期刊
SYMMETRY-BASEL
卷 15, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/sym15040801
关键词
Joule heating; molybdenum carbide; hydrogen evolution reaction; electrocatalytic water splitting
Developing earth-abundant electrocatalysts for hydrogen evolution reactions is crucial for renewable energy-driven water splitting. This study demonstrates the ultrafast synthesis of a Mo2C-based electrocatalyst using Joule heating. The as-prepared catalyst shows significantly enhanced HER performance compared to commercial Mo2C, with an overpotential of 288 mV for achieving a current density of -50 mA cm(-2) and good stability.
Developing earth-abundant electrocatalysts useful for hydrogen evolution reactions (HER) is critical for electrocatalytic water splitting driven by renewable energy. Molybdenum carbide (Mo2C) with the crystal structure of hexagonal symmetry has been identified to be an excellent HER catalyst due to its platinum-like electronic structure while the synthesis of Mo2C is generally time consuming and energy intensive. Herein, we demonstrated the ultrafast synthesis of a Mo2C-based electrocatalyst with Joule heating at 1473 K for only 6 s. Benefitting from several advantages including efficient catalytic kinetics, enhanced charge transport kinetics and high intrinsic activity, the as-prepared catalyst exhibited drastically enhanced HER performance compared with commercial Mo2C. It showed an overpotential of 288 mV for achieving a current density of -50 mA cm(-2) and good stability, which highlighted the feasibility of the Joule heating method towards preparing efficient electrocatalysts.
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