Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 6, Pages 5999-6008Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19071
Keywords
electrochemical oxidation; oxygen-containing functional groups; enlarged and connected pores; supercapacitors; carbons
Funding
- National Key Research and Development Program [2016YFB0901600]
- Science and Technology Commission of Shanghai [16JC1401700, 16ZR1440500]
- National Science Foundation of China [21871008, 51672301]
- Key Research Program of Chinese Academy of Sciences [QYZDJ-SSW-JSC013, KGZD-EW-T06]
- CAS Center for Excellence in Superconducting Electronics
- Youth Innovation Promotion Association CAS
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A facile approach of in situ electrochemical oxidation has been utilized to modify carbons, including activated carbon, mesoporous few-layer carbon, graphite, carbon fiber, and carbon nanotube, which induces oxygen-containing functional groups on its surface and simultaneously enhances its wettability, contributing to the improvement of capacitance. By this approach, the capacitance of commercialized activated carbon is increased by 86% in an acidic electrolyte, reaching 320 F g(-1), of which more than 96% was maintained after 10 000 cyclic tests. The huge improvement stems from electrochemical redox reactions enabled by oxygen-associated groups, which do-not adversely affect the porous structure and electrical conductivity. Such improvement will put carbon-based electrochemical capacitors into more practical application areas.
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