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Function regionalized catalyst promoted bromine redox kinetics for bromine-based flow battery
被引:0
作者:
Jiang, Hang
[1
,2
]
Liu, Siting
[1
,2
]
Wang, Qianyun
[1
,2
]
Zhang, Jianhua
[1
,2
]
Liao, Yufeng
[1
,2
]
Zhou, Zhikang
[1
,2
]
Wang, Jianwei
[1
,2
]
Wang, Danyang
[4
]
Lai, Qinzhi
[1
,2
]
Wang, Qian
[3
]
机构:
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ Qinhuangdao, Coll Resources & Mat, Qinhuangdao 066004, Peoples R China
[3] Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610065, Peoples R China
[4] Dalian Inst Measurement &Testing Co Ltd, Dalian 116023, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Bromine-based flow batteries;
Cathode catalyst;
Electrochemical kinetics;
TiO2 @NPC;
Function regionalization;
DOPED GRAPHENE;
ELECTRODE;
PROGRESS;
D O I:
10.1016/j.jpowsour.2024.235520
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Bromine-based flow batteries are considered as ideal large-scale energy storage devices, due to their attractive high energy density and low cost. However, the inferior redox activity of the Br-3(-)/Br- couple leads to limited power density, which cannot meet the practical application requirements. Herein, a flexible catalytic electrode is constructed by interweaving a nitrogen-doped porous carbon (NPC) coated TiO2 (TiO2@NPC) nanofiber, via electrospinning technique. In the electrode, the NPC component with superior affinity to the reactant Br-, could assistant rapid charge transfer, and facilitate the conversion from Br- to Br-3(-), which plays an excellent catalytic function. With a stronger adsorption for the oxidation product Br-3(-) than NPC, the TiO2 component can transfer Br-3(-) from NPC, releasing the catalytic active sites on NPC timely and enabling the reaction smoothly proceeded. Consequently, the regional differentiation strategy of the catalysis and adsorption functions significantly boosts the redox kinetic of the bromine chemistry. The Zinc-bromine flow batteries equipped with TiO2@NPC can run 200 cycles stably at 80 mA cm(-2), with the voltage efficiency and energy efficiency of 82.8 % and 81.6 %, respectively. This design provides a brand-new improvement strategy for bromine cathode from the perspective of accelerating the reaction rate-determining step.
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页数:9
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