Electrochemically Driven Surface Confined Acid/Base Reaction for an Ultrafast H( Supercapacitor.
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.
Journal of the American Chemical Society