In this study, we demonstrated the active electrocatalysts of CoS₂ coated by N-doped carbon microspheres, CoS₂@NHCs-x (x = 600, 700, 800, and 900; x is pyrolysis temperature). Results show that the obtained electrocatalyst has good catalytic activity and cyclic stability for the reaction of hydrogen evolution (HER) when the pyrolysis temperature is 800 °C. At a current density of 10 mA cm⁻², the overpotential of CoS₂@NHCs-800 was only 98 mV in 0.5 M H₂SO₄, and 118 mV in 1 M KOH, respectively. In addition, CoS₂@NHCs-800 also revealed excellent electrochemical stability, with only 32.7% performance degradation after continuous reaction in 0.5 M H₂SO₄ for 20 h, and the later current density almost no longer deceased with time as the reaction process stabilized. The excellent HER catalytic performance of CoS₂@NHCs-800 is mainly attributed to the rich active sites of CoS₂, the unique porous core-shell structure, and the enhanced conductivity of the carbon carrier caused by N and S co-doping. This work opens up an opportunity for advanced CoS₂-based electrocatalysts for HER.

在这项研究中，我们展示了由 N 掺杂碳微球 CoS ₂ @NHCs-x（x = 600、700、800 和 900；x 是热解温度）包覆的 CoS ₂活性电催化剂。结果表明，所获得的电催化剂在热解温度为800 ℃时对析氢（HER）反应具有良好的催化活性和循环稳定性。^{在10 mA cm -2}的电流密度下_{，CoS 2} @NHCs-800的过电势在0.5 M H ₂ SO ₄中仅为98 mV ，在1 M KOH 中仅为118 mV。此外，CoS _{2@NHCs-800还表现出优异的电化学稳定性，在0.5 M H 2} SO ₄中连续反应20 h后性能仅下降32.7%，随着反应过程的稳定，后期电流密度几乎不再随时间下降。_{CoS 2} @NHCs-800优异的HER催化性能主要归因于CoS _{2丰富的活性位点}、独特的多孔核壳结构以及N和S共掺杂提高了碳载体的导电性。_{这项工作为开发先进的基于 CoS 2的 HER 电催化剂}提供了机会。