Tuning the ferrous coordination structure enables a highly reversible Fe anode for long-life all-iron flow batteries

doi:10.1039/d1ta07295a

IMR OpenIR

	Tuning the ferrous coordination structure enables a highly reversible Fe anode for long-life all-iron flow batteries
	Song, Yuxi 1,2; Zhang, Kaiyue 1; Li, Xiangrong 1; Yan, Chuanwei 1; Liu, Qinghua 3; Tang, Ao 1
通讯作者	Liu, Qinghua(qinghua.liu.n@chnenergy.cn) ; Tang, Ao(a.tang@imr.ac.cn)
	2021-11-30
发表期刊	JOURNAL OF MATERIALS CHEMISTRY A
ISSN	2050-7488
卷号	9 期号:46 页码:26354-26361
摘要	An aqueous all-iron flow battery is a promising alternative for large-scale energy storage applications due to its low cost and high safety. However, the inferior Fe plating/stripping reversibility and hydrolysis of Fe2+ at the anode significantly limit its capacity retention and lifespan. Herein, we propose a coordination strategy to delicately tune the coordination structure of Fe2+, enabling effective suppression of Fe2+ hydrolysis and a highly reversible Fe plating/stripping reaction. Firstly, citrate is screened to feature a strong ligand field with the largest splitting energy among various ligand anions. Subsequently, sodium citrate bearing a high LUMO and large binding energy is identified to be the most suitable additive for the anolyte. By adding sodium citrate into FeCl2, the formation of a highly stable Fe2+-citrate coordination structure is confirmed via carboxyl groups. This effectively alters the intrinsic [Fe(H2O)(6)](2+) structure and yields remarkably improved Fe deposition during charging, allowing a highly reversible Fe plating/stripping reaction at the anode. Finally, the all-iron flow cell adopting Fe2+-citrate anolyte delivers an averaged 100% CE for 300 charge-discharge cycles without capacity decay, which is the longest cycle-life reported in the open literature.
资助者	Natural Science Foundation of Liaoning Province ; Chinese Energy Group Science and Technology Innovation ; National Natural Science Foundation of China ; Institute of Metal Research, Chinese Academy of Sciences
DOI	10.1039/d1ta07295a
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of Liaoning Province[2020-MS-012] ; Chinese Energy Group Science and Technology Innovation[ST930021001C] ; National Natural Science Foundation of China[21805290] ; Institute of Metal Research, Chinese Academy of Sciences
WOS研究方向	Chemistry ; Energy & Fuels ; Materials Science
WOS类目	Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS记录号	WOS:000720958800001
出版者	ROYAL SOC CHEMISTRY
引用统计	被引频次：34[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/167403
专题	中国科学院金属研究所
通讯作者	Liu, Qinghua; Tang, Ao
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang, Peoples R China 3.Natl Inst Clean & Low Carbon Energy, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Song, Yuxi,Zhang, Kaiyue,Li, Xiangrong,et al. Tuning the ferrous coordination structure enables a highly reversible Fe anode for long-life all-iron flow batteries[J]. JOURNAL OF MATERIALS CHEMISTRY A,2021,9(46):26354-26361.
APA	Song, Yuxi,Zhang, Kaiyue,Li, Xiangrong,Yan, Chuanwei,Liu, Qinghua,&Tang, Ao.(2021).Tuning the ferrous coordination structure enables a highly reversible Fe anode for long-life all-iron flow batteries.JOURNAL OF MATERIALS CHEMISTRY A,9(46),26354-26361.
MLA	Song, Yuxi,et al."Tuning the ferrous coordination structure enables a highly reversible Fe anode for long-life all-iron flow batteries".JOURNAL OF MATERIALS CHEMISTRY A 9.46(2021):26354-26361.