Semisacrificial Template Growth of Self‐Supporting MOF Nanocomposite Electrode for Efficient Electrocatalytic Water Oxidation,Advanced Functional Materials

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Semisacrificial Template Growth of Self‐Supporting MOF Nanocomposite Electrode for Efficient Electrocatalytic Water Oxidation
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-12-13 , DOI: 10.1002/adfm.201807418
Changsheng Cao _{1,

2} , Dong‐Dong Ma ₁ , Qiang Xu _{3,

4} , Xin‐Tao Wu ₁ , Qi‐Long Zhu ₁

Affiliation

Herein, the authors report, for the first time, the semisacrificial template growth of a self‐supporting metal–organic framework (MOF) nanocomposite electrode composed of ultrasmall iron‐rich Fe(Ni)‐MOF cluster‐decorated ultrathin Ni‐rich Ni(Fe)‐MOF nanosheets from the NiFe alloy foam, in which the Fe(Ni)‐MOF clusters are uniform with a particle size of 2–5 nm, while the thickness of the Ni(Fe)‐MOF nanosheets is only about 1.56 nm. When directly used as a self‐supported working electrode for the oxygen evolution reaction (OER), it can afford an impressive electrocatalytic performance with required overpotentials of 227 and 253 mV to achieve current densities of 10 and 100 mA cm⁻², respectively, much outperforming the benchmark of RuO₂ and most state‐of‐the‐art noble‐metal‐free catalysts. Characterizations demonstrated that the combination of the unique nanostructure of the catalyst and the strong coupling effect between Ni and Fe active sites should be responsible for its excellent OER performance. Remarkably, when coupled with a Pt electrode in an overall water splitting system, they only needed 1.537 V to achieve a current density of 10 mA cm⁻². The facile and economical methodology represents a new way to design and prepare high‐performance self‐supporting MOF electrocatalysts for highly efficient electrochemical processes.

中文翻译：

用于自动电催化水氧化的自支撑MOF纳米复合电极的半牺牲模板生长

在此，作者首次报告了由超小型富铁（Fe）（Ni）-MOF簇簇修饰的超薄富镍（Ni）组成的自支撑金属-有机骨架（MOF）纳米复合电极的半牺牲模板生长。由NiFe合金泡沫制成的Fe）-MOF纳米片，其中Fe（Ni）-MOF团簇是均匀的，粒径为2-5 nm，而Ni（Fe）-MOF纳米片的厚度仅为1.56 nm 。当直接用作析氧反应（OER）的自支持的工作电极，它可以承受一个令人印象深刻的电性能与227和253毫伏的超电势所需的以实现10和100mA厘米的电流密度^-2，分别多优于RuO ₂的基准以及大多数最先进的无贵金属催化剂。表征表明，催化剂独特的纳米结构以及Ni和Fe活性位点之间的强偶联效应的结合应归因于其出色的OER性能。值得注意的是，当在整个水分解系统中与Pt电极耦合时，它们仅需要1.537 V即可实现10 mA cm ^-2的电流密度。简便而经济的方法代表了一种设计和制备用于高效电化学过程的高性能自支撑MOF电催化剂的新方法。

更新日期：2018-12-13

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