Highly efficient and robust noble-metal free bifunctional water electrolysis catalyst achieved via complementary charge transfer

Nam Khen Oh, Jihyung Seo, Sangjin Lee, Hyung-Jin Kim, Ungsoo Kim, Junghyun Lee, Young-Kyu Han () and Hyesung Park ()
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Nam Khen Oh: Ulsan National Institute of Science and Technology (UNIST)
Jihyung Seo: Ulsan National Institute of Science and Technology (UNIST)
Sangjin Lee: Dongguk University-Seoul
Hyung-Jin Kim: Dongguk University-Seoul
Ungsoo Kim: Ulsan National Institute of Science and Technology (UNIST)
Junghyun Lee: Ulsan National Institute of Science and Technology (UNIST)
Young-Kyu Han: Dongguk University-Seoul
Hyesung Park: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract The operating principle of conventional water electrolysis using heterogenous catalysts has been primarily focused on the unidirectional charge transfer within the heterostructure. Herein, multidirectional charge transfer concept has been adopted within heterostructured catalysts to develop an efficient and robust bifunctional water electrolysis catalyst, which comprises perovskite oxides (La0.5Sr0.5CoO3–δ, LSC) and potassium ion-bonded MoSe2 (K-MoSe2). The complementary charge transfer from LSC and K to MoSe2 endows MoSe2 with the electron-rich surface and increased electrical conductivity, which improves the hydrogen evolution reaction (HER) kinetics. Excellent oxygen evolution reaction (OER) kinetics of LSC/K-MoSe2 is also achieved, surpassing that of the noble metal (IrO2), attributed to the enhanced adsorption capability of surface-based oxygen intermediates of the heterostructure. Consequently, the water electrolysis efficiency of LSC/K-MoSe2 exceeds the performance of the state-of-the-art Pt/C||IrO2 couple. Furthermore, LSC/K-MoSe2 exhibits remarkable chronopotentiometric stability over 2,500 h under a high current density of 100 mA cm−2.

Date: 2021
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DOI: 10.1038/s41467-021-24829-8

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