Affiliation:
1. Key Laboratory of Cluster Science Ministry of Education of China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 P. R. China
2. State Key Laboratory of Metal Matrix Composites School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
3. College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
Abstract
AbstractHierarchically structured bimetal hydroxides are promising for electrocatalytic oxygen evolution reaction (OER), yet synthetically challenging. Here, the nanoconfined hydrolysis of a hitherto unknown CoFe‐bimetal‐organic compound (b‐MOC) is reported for the controllable synthesis of highly OER active nanostructures of CoFe layered double hydroxide (LDH). The nanoporous structures trigger the nanoconfined hydrolysis in the sacrificial b‐MOC template, producing CoFe LDH core‐shell octahedrons, nanoporous octahedrons, and hollow nanocages with abundant under‐coordinated metal sites. The hollow nanocages of CoFe LDH demonstrate a remarkable turnover frequency (TOF) of 0.0505 s−1 for OER catalysis at an overpotential of 300 mV. It is durable in up to 50 h of electrolysis at step current densities of 10–100 mA cm−2. Ex situ and in situ X‐ray absorption spectroscopic analysis combined with theoretical calculations suggests that under‐coordinated Co cations can bind with deprotonated Fe‐OH motifs to form OER active Fe‐O‐Co dimmers in the electrochemical oxidation process, thereby contributing to the good catalytic activity. This work presents an efficient strategy for the synthesis of highly under‐coordinated bimetal hydroxide nanostructures. The mechanistic understanding underscores the power of maximizing the amount of bimetal‐dimer sites for efficient OER catalysis.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
2 articles.
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