Heteroatom doping is a feasible approach to adjust catalytic performance of the HER catalysts. In this work, we report a design of Fe-doped Co₉S₈ nanosheets grown on carbon cloth (Fe-Co₉S₈ NSs/CC) as a hydrophilic 3D monolithic electrocatalyst for efficient hydrogen evolution under all pH. The water contact angle and electrochemical measurements proved that the resultant material was hydrophilic for its nano hierarchitectures and dopant Fe enhanced the catalytic capability of singular Co₉S₈. In 1.0 M KOH, the Fe-Co₉S₈ NSs/CC possessed a relatively small Tafel slope (95.3 mV dec⁻¹) and required the overpotential of 83 mV to achieve 10 mA cm⁻². To drive the same current density, the overpotentials were 65 and 192 mV in 0.5 M H₂SO₄ and 1.0 M PBS, respectively. Meanwhile, it showed good cycle stability and durability over 20 h static test at alkaline and neutral condition. The flexible freestanding catalyst has great potential in practical applications.

杂原子掺杂是调节HER催化剂的催化性能的可行方法。在这项工作中，我们报告了在亲水碳3D整体电催化剂上在碳布上生长的掺杂Fe的Co ₉ S ₈纳米片的设计（Fe-Co ₉ S ₈ NSs / CC），以在所有pH值下有效地释放氢气。水接触角和电化学测量结果证明，所形成的材料在其纳米结构中是亲水的，掺杂铁增强了奇异Co ₉ S ₈的催化能力。在1.0 M KOH中，Fe-Co ₉ S ₈ NSs / CC具有相对较小的Tafel斜率（95.3 mV dec ^-1），并且需要83 mV的过电势才能达到10 mA cm ^-2。为了驱动相同的电流密度，在0.5 M H ₂ SO ₄和1.0 M PBS中的过电势分别为65和192 mV 。同时，在碱性和中性条件下经过20 h静态测试后，它显示出良好的循环稳定性和耐久性。柔性的独立式催化剂在实际应用中具有巨大的潜力。