The transition metal-based catalysts have great potential to boost the electrocatalytic reactions due to their flexible electronic configuration and low cost. This work developed a facile emulsion aggregation strategy to synthesize coral-like carbon-wrapped NiCo alloy (Co0.5Ni0.5/rGO) with high oxygen evolution reaction (OER) activity. The effect of alloy composition and GO content on the OER activity was evaluated in the 1 mol L-1 KOH solution. The OER mechanism of the Co0.5Ni0.5/rGO catalyst was disclosed by X-ray photoelectron spectra (XPS) and synchrotron radiation X-ray absorption spectra (XAS). The emulsion containing amphipathic graphene oxide (GO) and hydrophobic nickel/cobalt complexes induces the formation of the carbon-wrapped nanostructure. The coral-like Co0.5Ni0.5/rGO catalyst exhibits the low overpotential of 288 mV at the current density of 10 mA cm-2 and good durability, both of which are superior to the standard RuO2. The synergistic effect between nickel and cobalt effectively regulates the electronic structure and OER activity of the alloy catalysts. Moreover, the interaction between NiCo alloys and carbon shells can reduce the interfacial resistance.

中文翻译：

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通过乳化聚集策略获得的类似珊瑚的碳包裹NiCo合金，可进行有效的放氧反应。

过渡金属基催化剂由于其灵活的电子构型和低成本而具有促进电催化反应的巨大潜力。这项工作开发了一种简便的乳液聚集策略，以合成具有高氧释放反应（OER）活性的珊瑚状碳包裹NiCo合金（Co0.5Ni0.5 / rGO）。在1 mol L-1 KOH溶液中评估了合金成分和GO含量对OER活性的影响。通过X射线光电子能谱（XPS）和同步辐射X射线吸收谱（XAS）公开了Co0.5Ni0.5 / rGO催化剂的OER机理。包含两亲性氧化石墨烯（GO）和疏水性镍/钴络合物的乳液可诱导碳包裹纳米结构的形成。珊瑚状的Co0.5Ni0。5 / rGO催化剂在10 mA cm-2的电流密度下表现出288 mV的低过电势，并且具有良好的耐久性，两者均优于标准RuO2。镍和钴之间的协同作用有效地调节了合金催化剂的电子结构和OER活性。而且，NiCo合金和碳壳之间的相互作用可以降低界面电阻。