设计源自金属有机框架的新型二维 MoCoFe 混合纳米阵列电极，以实现高效电催化析氧,Fuel

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设计源自金属有机框架的新型二维 MoCoFe 混合纳米阵列电极，以实现高效电催化析氧
Fuel ( IF 6.7 ) Pub Date : 2023-09-21 , DOI: 10.1016/j.fuel.2023.129882
Renzhi Qi , Zhaoping Zhong , Fuqiang Chen , Xiang Zhen , Qian Li , Yuxuan Yang , Qihang Ye

能源短缺和环境污染的严重担忧需要开发下一代能源存储和转换设备。人们在开发用于水电解的替代电极材料（如金属氧化物、氢氧化物或其化合物材料）方面付出了巨大的努力。其中，多金属有机骨架纳米结构备受关注。金属有机框架（MOF）经历了拓扑转变和表面重构，多金属耦合效应可以显着提高析氧反应（OER）的性能，为获得有效催化剂提供了另一种途径。在这项研究中，制备了一种源自 MOF 的高活性二维 (2D) MoCoFe 杂化纳米片 (MoCoFe@NC) 作为 OER 电催化剂。鉴于二维纳米片结构和多金属电子修饰之间的协同效应，它为电化学反应提供了高度分散且易于接近的活性位点。同时，氮掺杂和碳基底上金属硫化物杂化产物的形成提高了电导率，显示出双功能电催化剂的潜力。在碱性电解液中，该电催化剂的初始电位为1.45 V，仅需285 mV的过电位即可达到10 mA cm的电流密度，并且具有良好的耐久性。连续运行20,000秒后仍表现出优异的活性。这些发现不仅为化合物材料中多金属配位结构演化与OER催化活性之间的相关性提供了理论支持，而且为混合电催化剂的发展提供了前景。

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Engineering the novel two-dimensional MoCoFe hybrid nanoarray electrodes derived from metal-organic frameworks for highly efficient electrocatalytic oxygen evolution

The serious concern about energy shortage and environmental pollution requires the development of next-generation energy storage and conversion equipment. People have made tremendous efforts in developing alternative electrode materials (like metal oxides, hydroxides, or their compound materials) for water electrolysis. Among them, polymetallic organic framework nanostructures have attracted much attention. Metal-organic frameworks (MOFs) have undergone a topological transformation and surface reconstruction, and the multi-metal coupling effect could significantly improve the performance of oxygen evolution reaction (OER), providing another way to obtain effective catalysts. In this study, a highly active two-dimensional (2D) MoCoFe hybrid nanosheets derived from MOFs (MoCoFe@NC) was prepared as an electrocatalyst for OER. Given the synergistic effect between 2D nanosheet structure and polymetallic electronic modification, it provides highly dispersed and accessible active sites for electrochemical reactions. At the same time, nitrogen doping and the formation of metal sulfide hybrid products on the carbon substrate improve the conductivity, showing the potential of bifunctional electrocatalysts. In alkaline electrolytes, the electrocatalyst reveals an initial potential of 1.45 V and only requires an overpotential of 285 mV to reach a current density of 10 mA cm and has good endurance. It still exhibits excellent activity after continuous operation for 20,000 s. These findings not only contribute theoretical support to the correlation between polymetallic coordination structure evolution and OER catalytic activity in compound materials but also offer prospects for the development of hybrid electrocatalysts.

更新日期：2023-09-21

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