Enhancing supercapacitive performance of hierarchical carbon by introducing extra-framework cations

Yuxiang Chen, Man Shen, Xin Fu, Hong Chang Yao, Xianming Zhang, Yunqi Liu, Xiaoying Liu, Kexin Yao

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We design and prepare a novel hierarchical carbonaceous electrode material (SBA-C-K-N) for supercapacitor. The combination of micro/mesoporous structure and extra-framework cations endow SBA-C-K-N with outstanding electrochemical performance, including high specific capacitance of 134.4 F g−1 at 0.5 A g−1 and ideal rate capability. Meanwhile, 97.3% of the specific capacitance is well-maintained after 1000 cycles. Surprisingly, comprehensive characterization showed extra-framework cations (K+) could boost capacitance and decrease charge-transfer resistance, which might result from pre-fixed extra-framework cations decreased interfacial barrier between electrode surface and electrolyte and sped up mass transport between both phases.
Original languageEnglish (US)
Pages (from-to)416-419
Number of pages4
JournalMaterials Letters
Volume253
DOIs
StatePublished - Jul 19 2019

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