Carbon with ultrahigh capacitance when graphene paper meets K3Fe(CN)6

Kunfeng Chen, Fei Liu, Dongfeng Xue, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

For the first time, we have shown a novel supercapacitor system with a graphene paper electrode in the redox-electrolyte of K3Fe(CN)6 based on the system-level design principle. By combining electric double-layer capacitance and pseudocapacitance, the specific capacitance could be increased 5-fold compared with the conventional electrode-electrolyte system. This large improvement is attributed to the additional redox reactions on the graphene paper electrode via the constituent ions of K3Fe(CN)6 in the redox-electrolyte, during which the discharge process is highly enhanced. More importantly, the potential interval could reach as high as 1.6 V beyond the limited operating voltage of water (∼1.23 V). After 5000 continuous cycles, 94% of the initial capacitance was retained. The newly designed novel supercapacitor system is binder-free, conducting additive-free and can deliver higher capacitance. This designed graphene-paper-electrode/redox-electrolyte system can provide a versatile strategy for high-capacitance supercapacitor systems. This journal is

Original languageEnglish (US)
Pages (from-to)432-439
Number of pages8
JournalNanoscale
Volume7
Issue number2
DOIs
StatePublished - Jan 14 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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