Modulation of Se vacancies on NiSe2@CoSe2 heterostructures to optimize ethanol electrooxidation activity for efficient hybrid water splitting and zinc–ethanol–air batteries

Jiahui Li; Feilong Fang; Yongqi Jian; Zilong Li; Junmin Zhu; Fangyan Xie; Jian Chen; Yanshuo Jin; Nan Wang; Xiyun Zhang; Hui Meng

doi:10.1039/D5QI00621J

Modulation of Se vacancies on NiSe₂@CoSe₂ heterostructures to optimize ethanol electrooxidation activity for efficient hybrid water splitting and zinc–ethanol–air batteries†

Jiahui Li,^a Feilong Fang,^a Yongqi Jian,^a Zilong Li,^ab Junmin Zhu,^a Fangyan Xie,^c Jian Chen,^c Yanshuo Jin,^a Nan Wang,

*^a Xiyun Zhang*^a and Hui Meng

*^a

Author affiliations

* Corresponding authors

^a Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Key Laboratory of Nanophotonic Manipulation, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, China
E-mail: tmh@jnu.edu.cn, xiyunzhang@jnu.edu.cn, nanwang@email.jnu.edu.cn

^b School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China

^c Instrumental Analysis & Research Center, Sun Yat-sen University, Guangzhou, Guangdong 510275, China

Abstract

We developed a V_Se-NiSe₂@CoSe₂ catalyst to increase active sites, fine-tune the electronic structure and optimize Co 3d orbital spin states, enabling superior ethanol oxidation (1.33 V@j₁₀). Replacing the OER with the EOR reduced the water-splitting voltage by 200 mV, decreased reaction energy consumption by 60%, lowered the battery charging voltage by 300 mV, and increased the round-trip efficiency by 10.8%.

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Inorganic Chemistry Frontiers

Modulation of Se vacancies on NiSe₂@CoSe₂ heterostructures to optimize ethanol electrooxidation activity for efficient hybrid water splitting and zinc–ethanol–air batteries†

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Modulation of Se vacancies on NiSe₂@CoSe₂ heterostructures to optimize ethanol electrooxidation activity for efficient hybrid water splitting and zinc–ethanol–air batteries

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