Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 18, Pages 15477-15483Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b02381
Keywords
KMnO4; nitrogen-doped carbon; compressible electrode; symmetric supercapacitor; excellent capability
Funding
- Natural Science Foundation of China [21406078, 21536005]
- Pearl River and S&T Nova Program of Guangzhou [201610010076]
- Fundamental Research Funds for the Central Universities
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Freestanding three-dimensional nitrogen-doped carbon foam with large pores is proposed as a promissing electrode configuration for elastic electronics. Although it exhibits excellent mechanical performance, the capacitive performances (especially its rate capability) are still unsatisfactory. By using KMnO4, we demonstrate a smart etching and catalytic process to form highly graphitized and etched nitrogen doped carbon foam (ENCF) with an exfoliated carbon-shell architecture. These compositional and structural features endow the ENCF electrodes with excellent electron conductivity as well as more ion-accessible electrochemical active sites. Significantly, all solid-state symmetric supercapacitor devices based on the ENCF electrodes exhibit enhanced specific capacitance and marked high-rate capability. Furthermore, the integrated device has no significant capacity loss under 60% compressive strain.
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