title: Electrochemically Driven Surface-Confined Acid/Base Reaction for an Ultrafast H(+) Supercapacitor.
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.
authors.affiliation: 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.
authors.forename: Shiyu
authors.initials: S
authors.lastname: Gan
authors.affiliation: 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.
authors.forename: Lijie
authors.initials: L
authors.lastname: Zhong
authors.affiliation: 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.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Lifang
authors.initials: L
authors.lastname: Gao
authors.affiliation: 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.
authors.forename: Dongxue
authors.initials: D
authors.lastname: Han
authors.affiliation: 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.
authors.forename: Li
authors.initials: L
authors.lastname: Niu