期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 161, 期 10, 页码 A1662-A1671出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0761410jes
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资金
- U.S. Department of Energy, Office of Electricity [1111358,0]
Seven organic ligands were investigated for use to coordinate reactive ions in the positive electrolyte of an all-iron flow battery. Exchange current densities, diffusion coefficients, and open circuit potentials of the ligand complexed ferric/ferrous redox couple are presented on a glassy carbon electrode. Results in a flow cell configuration suggest an ohmically controlled cell voltage and a highly distributed current distribution; the contributions from charge transfer and mass transfer are minor. The open circuit potential becomes a major factor in the selection of the complexed redox couple for determining which ligand to use in a flow battery. The iron-glycine complex was further investigated as a function of the ratio of glycine to ferric/ferrous ions and the pH of the solution. Results suggest a 1:1 glycine to iron ion electrolyte will be soluble up to 0.5 M ferric ion at a pH of 2 with a reaction potential of 468 mV vs. Ag/AgCl (0.690 vs SHE), suitable for use as a positive redox couple in the all-iron flow battery. (C) 2014 The Electrochemical Society. All rights reserved.
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