Abstract High specific activity of single-atom catalysts shows great application potentials in water splitting and fuel cell systems. Herein, we report a facile pyrolysis method to fabricate an atomically dispersed rhodium catalyst (Rh@NG). The Rh@NG exhibits outstanding electrochemical activities and kinetics for oxygen reduction reaction in alkaline medium, which can compare to Pt/C catalysts, along with excellent durability and good tolerance to methanol and carbon monoxide. The half-wave potential on Rh@NG in 0.1 M KOH and 0.1 M HClO4 is 0.848 and 0.74 V vs RHE, respectively. Additionally, the Rh@NG displays superior performance for hydrogen evolution reaction, offering a low overpotential of only 29, 33, and 45 mV at 10 mA cm−2 in 0.5 M H2SO4, 1.0 M KOH, and 0.1 M KOH, respectively. Theoretical calculations reveal that the efficient active sites for HER and ORR might be RhN3 and RhN4 moiety embedded into the N-doped graphene, respectively.

中文翻译：

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用于析氢和氧还原反应的原子铑催化剂

摘要 单原子催化剂的高比活性在水分解和燃料电池系统中显示出巨大的应用潜力。在此，我们报告了一种简便的热解方法来制造原子分散的铑催化剂（Rh@NG）。Rh@NG 在碱性介质中表现出优异的电化学活性和氧还原反应动力学，可与 Pt/C 催化剂相比，同时具有优异的耐久性和对甲醇和一氧化碳的良好耐受性。Rh@NG 在 0.1 M KOH 和 0.1 M HClO4 中的半波电位相对于 RHE 分别为 0.848 和 0.74 V。此外，Rh@NG 在析氢反应中表现出卓越的性能，在 0.5 M H2SO4、1.0 M KOH 和 0.1 M KOH 中，在 10 mA cm−2 下，其过电位分别仅为 29、33 和 45 mV。