Enhancing supercapacitive performance of hierarchical carbon by introducing extra-framework cations
Yao, Hong Chang
KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
Online Publication Date2019-07-19
Print Publication Date2019-10
Permanent link to this recordhttp://hdl.handle.net/10754/656778
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AbstractWe 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.
CitationChen, Y., Shen, M., Fu, X., Yao, H.-C., Zhang, X., Liu, Y., … Yao, K. X. (2019). Enhancing supercapacitive performance of hierarchical carbon by introducing extra-framework cations. Materials Letters, 253, 416–419. doi:10.1016/j.matlet.2019.07.072
SponsorsThe authors gratefully thank the financial supports of the National Natural Science Foundation of China (Grant no. 21576034).