Maximizing Vanadium Deployment in Redox Flow Batteries Through Chelation
Maximizing Vanadium Deployment in Redox Flow Batteries Through Chelation
复制标题
通过螯合最大限度地提高氧化还原液流电池中钒的分布
DOI：
10.1021/jacs.2c07076
复制
发表时间：
2022
影响因子：
15
通讯作者：
Marshak, Michael P.
中科院分区：
文献类型：
--
作者：
Waters, Scott E.;Davis, Casey M.;Thurston, Jonathan R.;Marshak, Michael P.
通过调整钒的配位球以适应7配位几何结构，由[V（DTPA）]2-/3-（DTPA =二亚乙基三胺五乙酸酯）产生高度可溶（>1.3 M）和还原（相对于Ag/AgCl为-1.2 V）的液流电池电解质。体光谱电化学原位进行评估材料的性质在氧化和还原状态。液流电池在近中性pH条件下组装，放电能量密度为12.5 Wh L-1，效率高。此外，产生了对于两种电解质使用相同的氨基多羧酸盐配体的第一螯合液流电池。所展示的电池表现出与铁钒和全钒液流电池相当的性能，同时使钒的有效放电能量（Wh/mol V）增加一倍，并最大限度地降低安全和操作风险，提供电网规模的储能替代方案。
By tailoring the coordination sphere of vanadium to accommodate a 7-coordinate geometry, a highly soluble (>1.3 M) and reducing (−1.2 V vs Ag/AgCl) flow battery electrolyte is generated from [V(DTPA)]2–/3–(DTPA = diethylenetriaminepentaacetate). Bulk spectroelectrochemistry is performedin situto assess material properties in both oxidized and reduced states. Flow batteries are assembled in near neutral pH conditions and operated with discharge energy densities of 12.5 Wh L–1and high efficiency. Further, the first chelated flow battery using the same aminopolycarboxylate ligand for both electrolytes is generated. The presented batteries demonstrate comparable performance to the iron–vanadium and all-vanadium flow batteries while doubling the effective discharge energy of vanadium (Wh per mol V) and minimizing safety and operating risks, offering grid-scale energy storage alternatives.