Ye Wenlong, Zhang Yanan, Fan Jinchen, Shi Penghui, Min Yulin, Xu Qunjie
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China.
Nanoscale. 2021 Feb 14;13(6):3698-3708. doi: 10.1039/d0nr08591j. Epub 2021 Feb 5.
In the oxygen evolution reaction (OER), highly active catalysts are essential for reducing the overpotential and improving the slow kinetics of the process. Cobalt selenide (CoSe) has always been considered as a promising electrocatalyst for the OER due to the well-suited electronic configuration of the Co ions in it. However, poor exposure of the active sites and low electron conductivity are still its biggest problems. In this study, we report an efficient Ni-doped rod-like CoSe hybridized with reduced graphene oxide (Ni-CoSe/rGO) as an OER electrocatalyst. The Ni doping regulates the electronic structure of CoSe and significantly reduces the overpotential of CoSe toward the OER under alkaline conditions. Simultaneously, hybridization of the reduced graphene oxide (rGO) enhances the conductivity which leads to the improvement in OER activity. The Ni-CoSe/rGO catalyst shows a lower overpotential (284 mV at 10 mA cm) as well as a Tafel slope (71 mV dec), which outperformed the benchmark of commercial RuO. Moreover, Ni-CoSe/rGO also shows high stability and long-term durability.
在析氧反应（OER）中，高活性催化剂对于降低过电位和改善该过程缓慢的动力学至关重要。硒化钴（CoSe）因其内部钴离子合适的电子构型，一直被视为一种有前景的OER电催化剂。然而，活性位点暴露不足和电子传导率低仍是其最大的问题。在本研究中，我们报道了一种高效的镍掺杂棒状CoSe与还原氧化石墨烯（Ni-CoSe/rGO）杂化的OER电催化剂。镍掺杂调节了CoSe的电子结构，并显著降低了CoSe在碱性条件下对OER的过电位。同时，还原氧化石墨烯（rGO）的杂化提高了导电性，从而提高了OER活性。Ni-CoSe/rGO催化剂表现出较低的过电位（在10 mA cm时为284 mV）以及塔菲尔斜率（71 mV dec），优于商业RuO的基准。此外，Ni-CoSe/rGO还表现出高稳定性和长期耐久性。
