4.7 Article

Molten salt method synthesis of multivalent cobalt and oxygen vacancy modified Nitrogen-doped MXene as highly efficient hydrogen and oxygen Evolution reaction electrocatalysts

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 615, Issue -, Pages 831-839

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.02.010

Keywords

MXene; Molten salt method; Multivalent cobalt; Oxygen vacancy; Hydrogen Evolution Reaction; Oxygen Evolution Reaction

Funding

  1. National Natural Science Foundation of China [61704114]
  2. Key areas of Science and Technology Program of Xinjiang Production and Construction Corps, China [2018AB004]
  3. National Science Foundation [CBET-1803256]

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Nitrogen-doped Ti3C2Ty MXene with multivalent cobalt and oxygen vacancy modification was prepared using a molten salt method, leading to improved electrocatalytic performance. The structural properties of MXene and the valence state of cobalt were adjusted by controlling the molten salt temperature. Electrochemical tests showed that the nitrogen-doped MXene exhibited good electrocatalytic stability.
Nitrogen-doped Ti3C2Ty MXene with multivalent cobalt and oxygen vacancy (Vo) modification was obtained by using molten salt method and greatly improved electrocatalytic performance. The structural properties of MXene and the valence state of cobalt were adjusted by controlling the molten salt temperature. When the molten salt treatment temperature was 377 degrees C, the obtained 377-CoOxN1-x-Ti3C2Ty maintained the chemical structure of MXene well, and also has high Co2+ content and Vo content. Electrochemical test results showed that 377-CoOxN1-x-Ti3C2Ty had the lowest Hydrogen Evolution Reaction (HER) overpotential of 87.73 mV and good electrocatalytic stability. X-ray Photoelectron Spectroscopy (XPS) results and Density Functional Theory (DFT) calculations showed that the introduction of polyvalent cobalt and Vo in the nitrogen-doped Ti3C2Ty structure effectively reduced the energy barrier of the electrocatalytic reaction of MXene. (C) 2022 Published by Elsevier Inc.

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