Rapid complete reconfiguration induced actual active species for industrial hydrogen evolution reaction

Luqi Wang, Yixin Hao, Liming Deng, Feng Hu, Sheng Zhao, Linlin Li and Shengjie Peng ()
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Luqi Wang: Nanjing University of Aeronautics and Astronautics
Yixin Hao: Nanjing University of Aeronautics and Astronautics
Liming Deng: Nanjing University of Aeronautics and Astronautics
Feng Hu: Nanjing University of Aeronautics and Astronautics
Sheng Zhao: Nanjing University of Aeronautics and Astronautics
Linlin Li: Nanjing University of Aeronautics and Astronautics
Shengjie Peng: Nanjing University of Aeronautics and Astronautics

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Rational regulation of electrochemical reconfiguration and exploration of activity origin are important foundations for realizing the optimization of electrocatalyst activity, but rather challenging. Herein, we potentially develop a rapid complete reconfiguration strategy for the heterostructures of CoC2O4 coated by MXene nanosheets (CoC2O4@MXene) during the hydrogen evolution reaction (HER) process. The self-assembled CoC2O4@MXene nanotubular structure has high electronic accessibility and abundant electrolyte diffusion channels, which favor the rapid complete reconfiguration. Such rapid reconfiguration creates new actual catalytic active species of Co(OH)2 transformed from CoC2O4, which is coupled with MXene to facilitate charge transfer and decrease the free energy of the Volmer step toward fast HER kinetics. The reconfigured components require low overpotentials of 28 and 216 mV at 10 and 1000 mA cm−2 in alkaline conditions and decent activity and stability in natural seawater. This work gives new insights for understanding the actual active species formation during HER and opens up a new way toward high-performance electrocatalysts.

Date: 2022
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DOI: 10.1038/s41467-022-33590-5

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