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Single Ru Atoms Stabilized by Hybrid Amorphous/Crystalline FeCoNi Layered Double Hydroxide for Ultraefficient Oxygen Evolution
Authors:Yidong Hu  Gan Luo  Liguang Wang  Xiaokang Liu  Yunteng Qu  Yansong Zhou  Fangyao Zhou  Zhijun Li  Yafei Li  Tao Yao  Can Xiong  Bo Yang  Zhenqiang Yu  Yuen Wu
Institution:1. School of Chemistry and Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 P. R. China

School of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060 P. R. China;2. Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023 P. R. China;3. X-Ray Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, IL, 60439 USA;4. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029 P. R. China;5. School of Chemistry and Materials Science, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026 P. R. China;6. Faculty of Science, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543 Singapore;7. Provincial Key Laboratory of Oil and Gas Chemical Technology, College of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing, 163318 P. R. China;8. School of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060 P. R. China

Abstract:In view of the sluggish kinetics suppressing the oxygen evolution reaction (OER), developing efficient and robust OER catalysts is urgent and essential for developing efficient energy conversion technologies. Herein, hybrid amorphous/crystalline FeCoNi layered double hydroxide (LDH)-supported single Ru atoms (Ru SAs/AC-FeCoNi) are developed for enabling a highly efficient electrocatalytic OER. The amorphous outer layer in Ru SAs/AC-FeCoNi is composed of abundant defect sites and unsaturated coordination sites, which can serve as anchoring sites to stabilize single Ru atoms. The crystalline inner has a highly symmetric rigid structure, thereby strengthening the stability of support for a long-lasting OER. The synergistic effects endow this hybrid catalyst with extremely low overpotential (205 mV at 10 mA cm−2). Density functional theory calculation indicates that single Ru atoms stabilized by hybrid amorphous/crystalline FeCoNi LDH facilitate the formation of Ru–O* (rate-determining step), thus accelerating the OER process.
Keywords:hybrid amorphous/crystalline  layered double hydroxides  oxygen evolution  single Ru atoms
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