3D cross-linked structure of dual-active site CoMoO 4 nanosheets@graphite felt electrode for vanadium redox flow battery.

Autor: Cheng T; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., Qi S; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., Jiang Y; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China. Electronic address: jiangyq@ncst.edu.cn., Feng Z; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., Jiang L; State Key Laboratory of Oil and Gas Equipment, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, China., Meng W; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China. Electronic address: 2007mengwei@163.com., Zhu J; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., Dai L; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., Wang L; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China., He Z; School of Chemical Engineering, North China University of Science and Technology, Tangshan 063009, China. Electronic address: zxhe@ncst.edu.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2024 Dec 12; Vol. 683 (Pt 1), pp. 713-721. Date of Electronic Publication: 2024 Dec 12.
DOI: 10.1016/j.jcis.2024.12.079
Abstrakt: Transition metal oxides (TMOs) can accelerate the sluggish kinetics of vanadium redox reaction, but face challenges like limited active sites and difficulties in nanometerization, highlighting the urgent need for new TMO electrocatalysts for vanadium redox flow battery (VRFB). CoMoO 4 features high electrochemical activity, numerous redox sites, flexible control, and short electron pathways. Herein, a high catalytic and super stable graphite felt electrode modified in situ with network cross-linking CoMoO 4 nanosheets (CoMoO 4 @GF) was prepared via hydrothermal and heat treatment method to enhance VRFB performance. CoMoO 4 @GF have large specific surface area, super hydrophilicity, and abundant reaction places, possessing well mass transfer, low charge transfer resistance, and sufficient catalytic sites. Therefore, the composite electrodes exhibit great electrocatalytic activity towards VO 2+ /VO 2 + and V 3+ /V 2+ redox reactions and excellent stability for VRFB. At 200 mA cm -2 , the energy efficiency (EE) of the CoMoO 4 @GF modified VRFB improved by 19.14 % over the blank VRFB with pristine graphite felt, and remained cycle stable after 350 cycles at 150 mA cm -2 . This work not only enriches the types of TMOs catalysts in VRFB, but also opens up a new direction for the research of bimetallic TMOs.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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