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Hierarchical Co,Fe-MOF-74/Co/Carbon Cloth Hybrid Electrode: Simple Construction and Enhanced Catalytic Performance in Full Water Splitting
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-21 , DOI: 10.1021/acssuschemeng.0c02993 Qingqing Zha 1 , Mingxia Li 1 , Zihao Liu 1 , Yonghong Ni 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-21 , DOI: 10.1021/acssuschemeng.0c02993 Qingqing Zha 1 , Mingxia Li 1 , Zihao Liu 1 , Yonghong Ni 1
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Metal–organic frameworks (MOFs) have attracted much interest in electrocatalysis as promising catalysts in recent years. However, it still remains a challenge to directly use MOF-based materials as bifunctional electrocatalysts for overall water splitting. Herein, a hierarchical Co,Fe-MOF-74/Co/carbon cloth (CC) three-layer hybrid electrode is synthesized by a simple electrochemical deposition technology with subsequent solvothermal treatment. Electrochemical performance investigations show that the as-constructed Co,Fe-MOF-74/Co/CC electrode exhibits impressive electrocatalytic activity for full water splitting, which only requires a low overpotential of 226 mV@20 mA cm–2 for the oxygen evolution reaction (OER) and 94 mV@–10 mA cm–2 for the hydrogen evolution reaction (HER), respectively. Employing the as-constructed electrode as the anode and cathode in a two-electrode setup simultaneously, only 1.65 V of the voltage is needed to deliver the current density of 20 mA cm–2. The above excellent electrochemical performances should be attributed to the specific architecture, the synergistic effect of the Co and Fe species, and the superhydrophilic surface of the catalyst. More importantly, further investigations uncover that metal hydroxides and oxyhydroxides produced in situ during electrochemical tests are the veritable active species, which promote the high catalytic activity of the present catalyst.
中文翻译：
分层Co，Fe-MOF-74 / Co /碳布混合电极：简单的结构和增强的全水分解催化性能
近年来，金属有机框架（MOF）作为有前途的催化剂已引起了人们对电催化的极大兴趣。但是，直接使用基于MOF的材料作为双功能电催化剂进行整体水分解仍然是一个挑战。在此，通过简单的电化学沉积技术并随后进行溶剂热处理，合成了分层的Co，Fe-MOF-74 / Co /碳布（CC）三层混合电极。电化学性能研究表明，如此构造的Co，Fe-MOF-74 / Co / CC电极在完全水分解中显示出令人印象深刻的电催化活性，对于析氧反应仅需226 mV @ 20 mA cm –2的低超电势（OER）和94 mV @ –10 mA cm –2分别用于析氢反应（HER）。在双电极设置中同时使用构造好的电极作为阳极和阴极，仅需要1.65 V的电压即可提供20 mA cm –2的电流密度。以上优异的电化学性能应归因于特定的结构，Co和Fe物种的协同效应以及催化剂的超亲水表面。更重要的是，进一步的研究发现，在电化学测试过程中现场产生的金属氢氧化物和羟基氧化物是名副其实的活性物质，它们促进了本催化剂的高催化活性。
更新日期：2020-07-21
中文翻译：
分层Co，Fe-MOF-74 / Co /碳布混合电极：简单的结构和增强的全水分解催化性能
近年来，金属有机框架（MOF）作为有前途的催化剂已引起了人们对电催化的极大兴趣。但是，直接使用基于MOF的材料作为双功能电催化剂进行整体水分解仍然是一个挑战。在此，通过简单的电化学沉积技术并随后进行溶剂热处理，合成了分层的Co，Fe-MOF-74 / Co /碳布（CC）三层混合电极。电化学性能研究表明，如此构造的Co，Fe-MOF-74 / Co / CC电极在完全水分解中显示出令人印象深刻的电催化活性，对于析氧反应仅需226 mV @ 20 mA cm –2的低超电势（OER）和94 mV @ –10 mA cm –2分别用于析氢反应（HER）。在双电极设置中同时使用构造好的电极作为阳极和阴极，仅需要1.65 V的电压即可提供20 mA cm –2的电流密度。以上优异的电化学性能应归因于特定的结构，Co和Fe物种的协同效应以及催化剂的超亲水表面。更重要的是，进一步的研究发现，在电化学测试过程中现场产生的金属氢氧化物和羟基氧化物是名副其实的活性物质，它们促进了本催化剂的高催化活性。
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