Unlocking Simultaneously the Temperature and Electrochemical Windows of Aqueous Phthalocyanine Electrolytes

Title
Unlocking Simultaneously the Temperature and Electrochemical Windows of Aqueous Phthalocyanine Electrolytes
Authors
헨켄스마이어디억Zhifeng HuangPeng ZhangXinpei GaoStefano PasseriniRuiyong Chen
Keywords
redox flow batteries; supporting electrolyte; imidazolium chloride; temperature stability; electrochemical window
Issue Date
2019-05
Publisher
ACS applied energy materials
Citation
VOL 2-3779
Abstract
The change from organic solvents to aqueous solvents for safe and robust battery electrolytes is desirable for electrochemical energy storage. Thermodynamically, water has an electrochemical stability window of 1.23 V, and pure water freezes at 0 °C. Such properties clearly restrict the high-voltage applications and temperature adaptability of aqueous electrolytes. Herein, we report an aqueous supporting electrolyte containing imidazolium chloride, showing unprecedented large temperature and electrochemical windows. Thermal analysis over − 80 to 80 °C shows such an aqueous electrolyte to be free of transition events of icing and phase changes. X-ray scattering results of these aqueous solutions in the presence of active materials reveal the pivotal role of imidazolium chloride to preserve the liquid phase at rather low temperatures. Metal phthalocyanines with electroactive organic ligand rings and multi-electron-transfer reactions at low negative potentials (− 0.2 to − 1.6 V vs Ag) are demonstrated in water-based anolytes for redox flow batteries for the first time over a broad temperature range.
URI
http://pubs.kist.re.kr/handle/201004/69433
ISSN
2574-0962
Appears in Collections:
KIST Publication > Article
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