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Nitrogen-phosphorous co-doped hollow carbon microspheres with hierarchical micro-meso-macroporous shell as efficient electrodes for supercapacitors

Abstract

Nitrogen-phosphorus co-doped hierarchical porous carbon microspheres (NPHCMs) have been prepared through combining polymerization of melamine-formaldehyde resin with co-assembly of colloidal silica nanospheres by using melamine and formaldehyde as carbon and nitrogen source, 1-hydroxyethylidene-1,1-diphosphonic acid as catalyst and phosphorus source. After carbonization and silica removal, the obtained NPHCMs possess high surface areas of 563 – 720 m2 g-1 with micropores, bi-model mesopores (2.6 and 3.7 nm) and macropores (250 nm) distributed in the shell. Owing to the incorporation of abundant N (7.0 – 15.35%) and P (0.09 – 0.16%) in the carbon matrix and the interconnected micro-, meso-, and macroporous structure, the NPHCMs exhibit good capacitive performances. The 800oC-carbonized sample shows a high specific capacitance and good rate capability (200 F g-1 at 0.5 A g-1, 132 F g-1 at 20 A g-1) in 6 M KOH electrolyte. The all-solid-state electrode fabricated by the NPHCMs present high specific capacitance of 180 F g-1 at 0.5 A g-1 and long cycle life with 91% capacitance retention after 5000 cycles at 0.5 A g−1 in a polyvinyl alcohol/KOH gel electrolyte, suggesting its great potentials in the development of high-performance energy storage devices.

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Publication details

The article was received on 24 Aug 2017, accepted on 04 Oct 2017 and first published on 06 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07488C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Nitrogen-phosphorous co-doped hollow carbon microspheres with hierarchical micro-meso-macroporous shell as efficient electrodes for supercapacitors

    N. Zhang, F. Liu, S. Xu, F. Y. Wang, Q. Yu and L. Liu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07488C

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