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Trifunctional Single-Atomic Ru Sites Enable Efficient Overall Water Splitting and Oxygen Reduction in Acidic Media

65 Pages Posted: 14 Jan 2020 Sneak Peek Status: Review Complete

See all articles by Xianyun Peng

Xianyun Peng

Tianjin University of Technology - Center for Electron Microscopy

Yuying Mi

Tianjin University of Technology - Center for Electron Microscopy

Shunzheng Zhao

University of Science and Technology Beijing - Department of Environmental Engineering

Xijun Liu

Tianjin University of Technology - Center for Electron Microscopy

Defeng Qi

Tianjin University of Technology - Center for Electron Microscopy

Jiaqiang Sun

Chinese Academy of Sciences (CAS) - State Key Laboratory of Coal Conversion

Yifan Liu

Shenzhen University - College of Physics and Optoelectronic Engineering

Haihong Bao

Tianjin University of Technology - Center for Electron Microscopy

Di Qu

Tsinghua University - Innovation Center of Advanced Optoelectronic Chip

Longchao Zhuo

Xi'an University of Technology - School of Materials Science and Engineering

Junqiang Ren

Lanzhou University of Technology - State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals

Jun Luo

Tianjin University of Technology - Center for Electron Microscopy

Xiaoming Sun

Beijing University of Chemical Technology - State Key Laboratory of Chemical Resource Engineering

More...

Abstract

Development of cost-effective, active trifunctional catalysts for acidic oxygen reduction (ORR) as well as hydrogen- and oxygen-evolution reactions (HER and OER, respectively) is highly desirable, albeit challenging. Herein, single-atomic Ru sites anchored onto Ti3C2Tx MXene nanosheets are first reported to serve as trifunctional electrocatalysts for simultaneously catalyzing acidic HER, OER, and ORR. A half-wave potential of 0.80 V for ORR and small overpotentials of 290 mV and 70 mV for OER and HER, respectively, at 10 mA cm−2 are achieved. Hence, a low cell voltage of 1.56 V is required for the acidic overall water splitting. The maximum power density of an H2–O2 fuel cell using the as-prepared catalyst can reach as high as 941 mW cm−2. Theoretical calculations revealed that isolated Ru–O2 sites can effectively optimize the adsorption of reactants/intermediates and lower the energy barriers for the potential-determining steps, thereby accelerating the HER, ORR, and OER kinetics.

Keywords: Trifunctional catalyst, Single-atomic Ru sites, Ti3C2Tx MXene nanosheets, Overall water splitting, Oxygen reduction, acidic environment.

Suggested Citation

Peng, Xianyun and Mi, Yuying and Zhao, Shunzheng and Liu, Xijun and Qi, Defeng and Sun, Jiaqiang and Liu, Yifan and Bao, Haihong and Qu, Di and Zhuo, Longchao and Ren, Junqiang and Luo, Jun and Sun, Xiaoming, Trifunctional Single-Atomic Ru Sites Enable Efficient Overall Water Splitting and Oxygen Reduction in Acidic Media. CHEMJOURNAL-D-20-00021. Available at SSRN: https://ssrn.com/abstract=3517557 or http://dx.doi.org/10.2139/ssrn.3517557
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Xianyun Peng

Tianjin University of Technology - Center for Electron Microscopy

China

Yuying Mi

Tianjin University of Technology - Center for Electron Microscopy

China

Shunzheng Zhao

University of Science and Technology Beijing - Department of Environmental Engineering

China

Xijun Liu (Contact Author)

Tianjin University of Technology - Center for Electron Microscopy ( email )

China

Defeng Qi

Tianjin University of Technology - Center for Electron Microscopy

China

Jiaqiang Sun

Chinese Academy of Sciences (CAS) - State Key Laboratory of Coal Conversion ( email )

China

Yifan Liu

Shenzhen University - College of Physics and Optoelectronic Engineering

China

Haihong Bao

Tianjin University of Technology - Center for Electron Microscopy

China

Di Qu

Tsinghua University - Innovation Center of Advanced Optoelectronic Chip

China

Longchao Zhuo

Xi'an University of Technology - School of Materials Science and Engineering ( email )

China

Junqiang Ren

Lanzhou University of Technology - State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals

Lanzhou, 730050
China

Jun Luo

Tianjin University of Technology - Center for Electron Microscopy

China

Xiaoming Sun

Beijing University of Chemical Technology - State Key Laboratory of Chemical Resource Engineering

China

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