Ultrathin metal–organic framework nanosheets for electrocatalytic oxygen evolution

Shenlong Zhao, Yun Wang, Juncai Dong, Chun-Ting He, Huajie Yin, Pengfei An, Kun Zhao, Xiaofei Zhang, Chao Gao, Lijuan Zhang, Jiawei Lv, Jinxin Wang, Jianqi Zhang, Abdul Muqsit Khattak, Niaz Ali Khan, Zhixiang Wei, Jing Zhang, Shaoqin Liu (), Huijun Zhao () and Zhiyong Tang ()
Additional contact information
Shenlong Zhao: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Yun Wang: Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University
Juncai Dong: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences
Chun-Ting He: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University
Huajie Yin: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Pengfei An: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences
Kun Zhao: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Xiaofei Zhang: School of Materials Science and Engineering, Harbin Institute of Technology
Chao Gao: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Lijuan Zhang: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Jiawei Lv: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Jinxin Wang: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Jianqi Zhang: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Abdul Muqsit Khattak: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Niaz Ali Khan: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Zhixiang Wei: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology
Jing Zhang: Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences
Shaoqin Liu: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology
Huijun Zhao: Centre for Clean Environment and Energy, Gold Coast Campus, Griffith University
Zhiyong Tang: CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology

Nature Energy, 2016, vol. 1, issue 12, 1-10

Abstract: Abstract The design and synthesis of efficient electrocatalysts are important for electrochemical conversion technologies. The oxygen evolution reaction (OER) is a key process in such conversions, having applications in water splitting and metal–air batteries. Here, we report ultrathin metal–organic frameworks (MOFs) as promising electrocatalysts for the OER in alkaline conditions. Our as-prepared ultrathin NiCo bimetal–organic framework nanosheets on glassy-carbon electrodes require an overpotential of 250 mV to achieve a current density of 10 mA cm−2. When the MOF nanosheets are loaded on copper foam, this decreases to 189 mV. We propose that the surface atoms in the ultrathin MOF sheets are coordinatively unsaturated—that is, they have open sites for adsorption—as evidenced by a suite of measurements, including X-ray spectroscopy and density-functional theory calculations. The findings suggest that the coordinatively unsaturated metal atoms are the dominating active centres and the coupling effect between Ni and Co metals is crucial for tuning the electrocatalytic activity.

Date: 2016
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DOI: 10.1038/nenergy.2016.184

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