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

Journal of the American Chemical Society
Shiyu GanLi Niu

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 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.

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Citations

Feb 7, 2017·Chemical Communications : Chem Comm·M M Lounasvuori, K B Holt
Oct 4, 2018·Chemical Communications : Chem Comm·Dmitry PankratovQijin Chi
Aug 11, 2020·Physical Chemistry Chemical Physics : PCCP·Amanda B QuadreGuilherme Volpe Bossa
Nov 7, 2017·Advanced Energy Materials·Islam M MosaJames F Rusling
Jun 24, 2020·Journal of the American Chemical Society·Aimin GeAndrew A Peterson

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