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Electron transport shuttle mechanism via Fe-N-C bond derived from conjugated microporous polymer for supercapacitor

Abstract

A new innovative electrode material (Fe-P800) consisting of a metal complex anchored on carbon via the utilization of iron-porphyrin conjugated microporous polymer (Fe-CMP) was prepared after pyrolyzing at 800˚C. The usage of the polymer with iron-porphyrin repeating units maximized the possible formation of Fe-Nx coordination within the bulk of the sample while the thermal treatment rendered the carbon framework to form a distinct arrangement between metal, nitrogen and carbon with a high surface area of 450 m2/g. The formation of the M-N-C bond, confirmed through XPS analysis, established a direct interaction between metal and carbon material. Thus, indisputable synergistic effect was observed leading to a high capacitance of 182 F/g at current density of 1 A/g despite its low metal loading of ~1%. It also exhibited highly robust cycling stability of ~100% capacitance retention even after 5000 cycles (10 A/g). In this study, a new mechanism was proposed wherein the metal (iron) center features an electron access point via its highly reversible redox reactivity providing a shuttle effect for charge transfer to the conductive graphitic carbon matrix.

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Publication details

The article was received on 31 Oct 2017, accepted on 04 Dec 2017 and first published on 04 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04094F
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Electron transport shuttle mechanism via Fe-N-C bond derived from conjugated microporous polymer for supercapacitor

    A. C. Lim, H. Jadhav and J. G. Seo, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT04094F

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