期刊
JOURNAL OF POWER SOURCES
卷 326, 期 -, 页码 569-574出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.04.036
关键词
Polyoxometalate; Activated carbon; Protic ionic liquid; Supercapacitor; Nanocomposite
资金
- Sila Nanotechnologies, Inc.
- Army Research Office [W911NF-12-1-0259]
- Chinese Scholarship Council
Nanocomposites based on polyoxometalates (POMs) nanoconfined in microporous carbons have been synthesized and used as electrodes for supercapacitors. The addition of the pseudocapacitance from highly reversible redox reaction of POMs to the electric double-layer capacitance of carbon lead to an increase in specific capacitance of similar to 90% at 1 mV s(-1). However, high solubility of POM in traditional aqueous electrolytes leads to rapid capacity fading. Here we demonstrate that the use of aqueous solutions of protic ionic liquids (P-IL) as electrolyte instead of aqueous sulfuric acid solutions offers an opportunity to significantly improve POM cycling stability. Virtually no degradation in capacitance was observed in POM-based positive electrode after 10,000 cycles in an asymmetric capacitor with P-IL aqueous electrolyte. As such, POM-based carbon composites may now present a viable solution for enhancing energy density of electrical double layer capacitors (EDLC) based on pure carbon electrodes. (C) 2016 Published by Elsevier B.V.
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