摘要
Developing cost-effective and efficient electrocatalysts is essential for addressing the slow kinetics and high overpotential in the hydrogen evolution reaction(HER),but significant challenges remain.Here,we fabricated the sandwich-structured HER electrodes using two types of N/O-doped graphene oxide films and Ni foam,denoted as Ni/N/O-rGO-1/Ni and Ni/N/O-rGO-2/Ni.Electrochemical analysis indicates that Ni/N/O-rGO-1/Ni presents superior HER performances in a 0.5 M H_(2)SO_(4) solution at approximately 0℃ compared to Ni/N/O-rGO-2/Ni,such as an acceptable overpotential of 229 mV at 10 mA cm^(-2),a Tafel slope of 162.0 mV dec^(−1),and a 275 hour electrocatalytic lifespan with 17.82-fold current retention.After careful analysis,this attractive electrochemical stability can be attributed to the two-electron oxygen reduction(2e^(−)-ORR)induced by pyrrolic nitrogen in N/O-rGO,which is confirmed by conducting HER tests on fresh Ni electrodes and investigating the impact of electrode spacing,solution temperature,and electrolyte types on the HER.To sum up,the discovery of the 2e^(−)-ORR can improve the HER performance of Ni/N/O-rGO-1/Ni under harsh conditions,providing a feasible approach for developing efficient HER catalysts in demanding environments.
基金
supported by the Natural Science Foundation of China(No.22074130)
Zhoukou Normal University Applied Course Project(No.YYKC-2024009).
