https://scholars.lib.ntu.edu.tw/handle/123456789/636049
Title: | Symmetry-breaking design of an organic iron complex catholyte for a long cyclability aqueous organic redox flow battery | Authors: | Li, Xiang Gao, Peiyuan Lai, Yun Yu Bazak, J. David Hollas, Aaron Lin, Heng Yi Murugesan, Vijayakumar Zhang, Shuyuan Cheng, Chung Fu Tung, Wei Yao Lai, Yueh Ting Feng, Ruozhu Wang, Jin CHIEN LUNG WANG Wang, Wei Zhu, Yu |
Issue Date: | 1-Sep-2021 | Journal Volume: | 6 | Journal Issue: | 9 | Start page/Pages: | 873 | Source: | Nature Energy | Abstract: | The limited availability of a high-performance catholyte has hindered the development of aqueous organic redox flow batteries (AORFB) for large-scale energy storage. Here we report a symmetry-breaking design of iron complexes with 2,2′-bipyridine-4,4′-dicarboxylic (Dcbpy) acid and cyanide ligands. By introducing two ligands to the metal centre, the complex compounds (M4[FeII(Dcbpy)2(CN)2], M = Na, K) exhibited up to a 4.2 times higher solubility (1.22 M) than that of M4[FeII(Dcbpy)3] and a 50% increase in potential compared with that of ferrocyanide. The AORFBs with 0.1 M Na4[FeII(Dcbpy)2(CN)2] as the catholyte were demonstrated for 6,000 cycles with a capacity fading rate of 0.00158% per cycle (0.217% per day). Even at a concentration near the solubility limit (1 M Na4[FeII(Dcbpy)2(CN)2]), the flow battery exhibited a capacity fading rate of 0.008% per cycle (0.25% per day) in the first 400 cycles. The AORFB cell with a nearly 1:1 catholyte:anolyte electron ratio achieved a cell voltage of 1.2 V and an energy density of 12.5 Wh l–1. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/636049 | ISSN: | 2058-7546 | DOI: | 10.1038/s41560-021-00879-6 |
Appears in Collections: | 化學系 |
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