自牺牲模板法制备氮掺杂碳化钼/碳析氢电催化剂

采用g-C₃N₄为自牺牲模板和氮源，葡萄糖为碳源，钼酸铵为钼源，制备具有二维纳米结构的氮掺杂碳化钼修饰碳纳米片(N-Mo₂C/C)，并评价其电催化析氢性能。利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、拉曼(Raman)等测试手段对N-Mo₂C/C的组成、形貌及结构进行分析。结果表明，氮掺杂的Mo₂C纳米颗粒均匀分散在二维碳纳米片上，粒径主要分布在3~5 nm。利用电化学工作站测试 N-Mo₂C/C的电催化析氢性能，在1 mol/L KOH溶液中，电流密度为10 mA/cm²时其对应的过电势为185 mV，Tafel斜率为69 mV/dec，经20 h循环可维持稳定的析氢电势。

Self-sacrificing templated preparation of nitrogen-doped molybdenum carbide/carbon as hydrogen evolution electrocatalyst

Using g-C₃N₄ as self-sacrificing template and nitrogen source, glucose as carbon source, and ammonium molybdate as molybdenum source, nitrogen-doped molybdenum carbide modified carbon nanosheets (N-Mo₂C/C) with two-dimensional nanostructures were prepared and evaluated its electrocatalytic hydrogen evolution performance. X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), Raman spectroscopy, etc. were employed to analyze the compositions, morphologies and microstructures of the as-prepared N-Mo₂C/C. The results show that ultrafine nitrogen-doped Mo₂C nanoparticles with a diameter of 3—5 nm can be uniformly distributed on the 2D carbon nanosheets. The electrocatalytic performances of N-Mo₂C/C for hydrogen evolution were tested by using an electrochemical workstation, which demonstrates that the N-Mo₂C/C only exhibits an overpotential of 185 mV at 10 mA/cm² in 1 mol/L KOH solution, and a stable hydrogen evolution potential could be maintained for 20 h in a long-term cycling test.