Ultrafine Molybdenum Carbide Nanoparticles Composited with Carbon as a Highly Active Hydrogen‐Evolution Electrocatalyst
作者： Ruguang Ma , Yao Zhou , Yongfang Chen , Pengxi Li , Qian Liu
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摘要: The replacement of platinum with non-precious-metal electrocatalysts high efficiency and superior stability for the hydrogen-evolution reaction (HER) remains a great challenge. Herein, we report one-step synthesis uniform, ultrafine molybdenum carbide (Mo2C) nanoparticles (NPs) within carbon matrix from inexpensive starting materials (dicyanamide ammonium molybdate). optimized catalyst consisting Mo2C NPs sizes lower than 3 nm encapsulated by ultrathin graphene shells (ca. 1-3 layers) showed HER activity in acidic media, very low onset potential -6 mV, small Tafel slope 41 mV dec(-1), large exchange current density 0.179 mA cm(-2), as well good during operation 12 h. These excellent properties are similar to those state-of-the-art 20% Pt/C make one most active acid-stable ever reported HER.
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