Abstract Metal-organic frameworks (MOFs) have been regarded as promising catalyst materials due to the richness of coordinately unsaturated metal sites on the surface, which can act as catalytic active centres. In this study, a hybrid MOF material composed of Fe-based MOF and Co-based MOF was prepared with the involvement of graphene oxide nanosheets as additive. It was demonstrated that the hybrid MOF materials showed much higher electro-catalytic activity towards oxygen evolution than the single-phase counterparts. To drive current density of 10 mA cm-2, the hybrid CoFe-based MOF only needed an over potential of 290 mV in 1 M KOH. The catalytic activity could sustain for a longer time with only slight current density decrease. During oxygen evolution operation, the MOF catalyst evolved into catalytic active species but kept well the microscale sheet-like structure. It is thus believed that this study will provide an avenue for the development of advanced electrocatalysts.

中文翻译：

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FeCo 基杂化 MOF 衍生活性物质可有效析氧

摘要 金属有机骨架（MOFs）由于表面丰富的配位不饱和金属位点可作为催化活性中心而被认为是有前景的催化剂材料。在这项研究中，以氧化石墨烯纳米片作为添加剂，制备了由 Fe 基 MOF 和 Co 基 MOF 组成的混合 MOF 材料。结果表明，与单相材料相比，混合 MOF 材料对析氧具有更高的电催化活性。为了驱动 10 mA cm-2 的电流密度，混合 CoFe 基 MOF 在 1 M KOH 中只需要 290 mV 的过电位。催化活性可以维持更长的时间，电流密度只有轻微的下降。在析氧操作过程中，MOF 催化剂演化为催化活性物质，但保持良好的微尺度片状结构。因此，相信这项研究将为开发先进的电催化剂提供一条途径。