期刊
CHEMELECTROCHEM
卷 6, 期 8, 页码 2167-2173出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201801825
关键词
AC line filtering; frequency response; room temperature ionic liquids; supercapacitors; vertically-oriented carbon nanowall foam
资金
- National Natural Science Foundation of China [51722604]
- Zhejiang Provincial Natural Science Foundation of China [LR17E060002]
- Fundamental Research Funds for the Central Universities [2018XZZX002-17]
- National Program for Support of Top-notch Young Professionals
Supercapacitors have been considered as a promising alternative of aluminum electrolytic capacitors (AECs) for AC line filtering applications. However, realizing supercapacitors with fast frequency response and superior energy density still remains an open issue. Herein, we demonstrate a hierarchical, vertically-oriented carbon nanowall foam (CWF) supercapacitor using mixed room temperature ionic liquids (RTILs) for high-performance AC line filtering. Hierarchical CWF exhibits macrospores as electrolyte reservoirs to shorten ion transport distance, vertically-oriented, open channels to enable fast ion diffusion and consecutive scaffolds to promote electron transfer. CWF supercapacitor using RTIL mixture realizes a recorded-high areal energy density of 1.23 mu Whcm 2 at 120 Hz (almost similar to 2.0 times/similar to 10.0 times larger than those of organic/aqueous electrolytes, respectively) and fast frequency response (RC time constant = similar to 1.3 ms). More importantly, CWF supercapacitor achieves a capacitance advantage over commercial AECs up to 1,000 V, substantially larger than those reported in state-of-the-art literatures (maximum of similar to 250 V).
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