High coercivity cobalt carbide nanoparticles as electrocatalysts for hydrogen evolution reaction

作者：Yaqin Qie, Yixuan Liu, Fanqi Kong, Zhilin Yang, Hua Yang · 发表于：Nano Research · 年份：2022 · DOI：10.1007/s12274-021-4036-1 · 被引用次数：28 · 研究领域：Electrocatalysts for Energy Conversion、Advancements in Battery Materials、Catalytic Processes in Materials Science

Cobalt carbide nanoparticles (NPs), as a typical carbide material, have attracted extensive attention in the fields of magnetism and electrochemistry. Herein, we adopted a modified solution route by pyrolysis long-chain amines at high temperatures to obtain Co 2 C NPs, in which different forms of Co NPs were used as precursors. The results reveal that no matter what the structure of the precursor and the type of long-chain amine, single-phase Co 2 C NPs with good crystallinity are obtained. At the same time, carbonization of hexagonal close packed (hcp) cobalt as the precursor gives the materials high magnetic anisotropy, exhibiting a large coercivity (∼ 1,300 Oe) on the nanoscale. In terms of catalytic properties, benefiting from intrinsically high activity of Co 2 C NPs, the material demonstrates superior hydrogen evolution reaction (HER) performance, with optimal overpotential as low as 73 mV at the current density of 10 mA·cm −2 . This provides new ideas for the further development of transition metal carbides (TMCs) and the improvement of their magnetic and electrocatalytic properties.