A Tunable Amorphous Heteronuclear Iron and Cobalt Imidazolate Framework Analogue for Efficient Oxygen Evolution Reactions
A Tunable Amorphous Heteronuclear Iron and Cobalt Imidazolate Framework Analogue for Efficient Oxygen Evolution Reactions
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用于高效析氧反应的可调节非晶异核铁钴咪唑酯框架类似物
DOI：
10.1002/ejic.202000974
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发表时间：
2021-02
影响因子：
2.3
通讯作者：
Wang Jian-Qiang
中科院分区：
文献类型：
--
作者：
Zhao Qingyun;Lin Xiao;Zhou Jing;Zhao Chong;Zheng Dehua;Song Sanzhao;Jing Chao;Zhang Linjuan;Wang Jian-Qiang
非晶态金属有机骨架(AMOF)的结构多样性和可调谐功能突出了这类材料作为开发可持续能源技术的有前途的候选材料。将杂金属掺杂到MOF中可以大大提高其在析氧反应中的电催化性能。其中，Fe~(3+)离子的引入使晶态钴基MOF的OER性能得到了显著的改善，形成了非晶态结构。优化的表面形貌和电化学比表面积极大地促进了电荷的传输。Fe/Co摩尔比为1/4的AMOF(1 ： 4)表现出良好而稳定的OER活性，其超低过电势(10 cm−2时为256 mV)和Tafel斜率为42.7 mV dec−1。XAS发现，AFC-MOF(1 ： 4)中的大部分Co2+在OER过程中被转化为低自旋Co3+，而Fe3+在OER过程中保持不变，支持Fe和Co之间的协同催化机制。这种材料的性能优于基准IrO2，这可能是由于其中空的非晶态结构和优化的电子性质。
The structural diversity and tunable functionality of the amorphous metal‐organic frameworks (aMOFs) highlights this class of materials as a promising candidate for the development of sustainable energy technologies. The electrocatalytic performance in oxygen evolution reaction (OER) can be greatly improved by incorporating the hetero‐metallics into MOFs. Herein, the OER performance was significantly improved by the incorporation of Fe3+ions into the crystalline cobalt‐based MOF, leading to amorphous structure. Benefiting from the optimized surface morphology and electrochemical surface area, charge transport, was greatly facilitated. The Fe/Co aMOF with 1/4 ratio (labeled as AFC‐MOFs (1 : 4)) exhibited an excellent and stable OER activity, with an ultralow overpotential (256 mV at 10 mA cm−2) and Tafel slope of 42.7 mV dec−1. XAS found that the majority of Co2+in AFC‐MOFs (1 : 4) is converted to low‐spin Co3+upon OER, while Fe3+is maintained during the OER process, supporting the synergistic catalytic mechanism between Fe and Co. This material outperforms benchmark IrO2, which could be attributed to the hollow amorphous structure and the optimized electronic properties.
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