Ultrafast Synthesis of Mo2C-Based Catalyst by Joule Heating towards Electrocatalytic Hydrogen Evolution Reaction

• Published in: Symmetry (Basel) Vol. 15; no. 4; p. 801
• Main Authors: Zhang, Hefeng, Qi, Shengliang, Zhu, Kaixin, Wang, Haidong, Zhang, Guanghui, Ma, Weiguang, Zong, Xu
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.04.2023
• Subjects: Carbon black; Catalysts; Charge transport; Chemical synthesis; Crystal structure; Electrocatalysts; electrocatalytic water splitting; Electrodes; Electronic structure; Ethanol; Graphene; High temperature; Hydrogen; hydrogen evolution reaction; Hydrogen evolution reactions; Joule heating; Kinetics; Molybdenum carbide; Morphology; Nanoparticles; Ohmic dissipation; Particle size; Radiation; Reaction kinetics; Resistance heating; Scanning electron microscopy; Spectrum analysis; Voltammetry; Water splitting
• ISSN: 2073-8994; 2073-8994
• DOI: 10.3390/sym15040801

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.