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 language | English (US) |
---|---|
Pages (from-to) | 416-419 |
Number of pages | 4 |
Journal | Materials Letters |
Volume | 253 |
DOIs | |
State | Published - Jul 19 2019 |