Abstract：
Constructing high-activity electrocatalysts towards hydrogen evolution reaction (HER) is an essential way to achieve efficient, green and sustainable energy from water electrolysis. In this work, rhodium (Rh) nanoparticles anchored on cobalt (Co)/nitrogen (N)-doped carbon nanofibers (NCNFs) catalyst is prepared by the electrospinning-pyrolysis-reduction method. The synergy effect between Co-NCNFs and Rh nanoparticles contributes to the superior HER activity and favorable durability. The optimized 0.15Co-NCNFs-5Rh sample exhibits ultralow overpotentials of 13 and 18 mV to reach 10 mA cm-2 in an alkaline and acidic electrolyte, surpassing many Rh-based or Co-based electrocatalysts reported in the literature. Additionally, the Co-NCNFs-Rh sample shows a better HER activity than benchmark Pt/C catalyst in an alkaline medium at all current densities and in an acidic condition at higher current densities, offering its promising practical applications. Thus, this work provides an efficient methodology to construct high-performance HER electrocatalysts.
摘要：
构建高活性的析氢反应(HER)电催化剂是实现高效、来自水电解的绿色和可持续能源。在这项工作中,通过静电纺丝-热解-还原法制备了锚定在钴（Co）/氮（N）掺杂的碳纳米纤维（NCNFs）催化剂上的铑（Rh）纳米颗粒。Co-NCNF和Rh纳米颗粒之间的协同作用有助于优异的HER活性和良好的耐久性。优化的0.15Co-NCNFs-5Rh样品在碱性和酸性电解质中表现出13和18mV的超低过电位，达到10mAcm-2，超过文献中报道的许多Rh基或Co基电催化剂。此外,Co-NCNFs-Rh样品在碱性介质中在所有电流密度下和在酸性条件下在较高电流密度下显示出比基准Pt/C催化剂更好的HER活性。提供了其有前途的实际应用。因此，这项工作提供了一种有效的方法来构建高性能的HER电催化剂。
