Journal article
Electrochemically Driven Surface-Confined Acid/Base Reaction for an Ultrafast H(+) Supercapacitor
State Key Laboratory of Electroanalytical Chemistry, CAS Center for Excellence in Nanoscience, c/o Engineering Laboratory for Modern Analytical Techniques, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, China.1
University of Chinese Academy of Sciences , Beijing 100049, China.2
We discovered an organic weak acid, 3,4,9,10-perylene tetracarboxylic acid (PTCA), confined on the electrode surface, revealing a reversible and ultrafast protonation/deprotonation non-Faradaic process but exhibiting analogous voltammetric peaks (capacitive peaks). A further synthesized PTCA-graphene supramolecular nanocomplex discloses a wide voltage window (1.2 V) and ultrahigh specific capacitance up to 143 F g(-1) at an ultrafast charge-discharge density of 1000 A g(-1) (at least 1 order of magnitude faster than present speeds).
The capacitance retention maintained at 73% after 5000 cycles. This unique capacitive voltammetric behavior suggests a new type of charge-storage modes, which may offer a way for overcoming the present difficulties of supercapacitors.
| Language: | English |
|---|---|
| Year: | 2016 |
| Pages: | 1490-1493 |
| ISSN: | 15205126 and 00027863 |
| Types: | Journal article |
| DOI: | 10.1021/jacs.5b12272 |
