DataVXACS Applied Energy MaterialsPaper
journal article·2019-05-28

Unlocking Simultaneously the Temperature and Electrochemical Windows of Aqueous Phthalocyanine Electrolytes

Zhifeng Huang, Peng Zhang, Xinpei Gao, Dirk Henkensmeier, Stefano Passerini, Ruiyong Chen

ACS Applied Energy Materials· Volume 2· Issue 5
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Source abstract

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.
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Research context

Energy storage

OpenAlex topics: Advanced battery technologies research · Electrocatalysts for Energy Conversion · Supercapacitor Materials and Fabrication

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Transfercenter Sustainable Electrochemistry, Saarland University and KIST Europe, 66125 Saarbrücken, Germany

INM-Leibniz Institute for New Materials, 66123 Saarbrücken, Germany

School of Materials Science and Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China

Helmholtz Institute Ulm, Helmholtzstrasse 11, 89081 Ulm, Germany

Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany

Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea

Division of Energy and Environment Technology, University of Science and Technology, Seoul 02792, Republic of Korea

Green School, Korea University, Seoul 02841, Republic of Korea

Funding

Helmholtz-Gemeinschaft · Bundesministerium f?r Wirtschaft und Energie · Korea Institute for Advancement of Technology · Korea Institute of Science and Technology · China Scholarship Council

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