Electrochemically Driven Surface-Confined Acid/Base Reaction for an Ultrafast H+ Supercapacitor

Shiyu Gan, Lijie Zhong, Lifang Gao, Dongxue Han, Li Niu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 supra molecular 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.
Original languageEnglish
JournalJournal of the American Chemical Society
Volume138
Issue number5
Pages (from-to)1490-1493
Number of pages4
ISSN0002-7863
DOIs
Publication statusPublished - 2016
Externally publishedYes

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