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Enhanced Na+ pseudocapacitance in a P, S co-doped carbon anode arising from the surface modification by sulfur and phosphorus with C–S–P coupling

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Abstract

Enhanced phosphorus (7.2 wt%) and sulfur (15.7 wt%) co-doped carbon (PSC) is synthesized via a one-step sintering of carbon disulfide and red phosphorus in a vacuum. It is found that S atoms can act as immobilization sites for phosphorus by covalently bonding with P atoms in the form of C–S–P, and thus high-level doping of phosphorus can be realized. Owing to the high-level doping, this co-doped carbon shows enlarged interlayer spacing, improved charge transfer capability and strong adsorption of Na+ ions. When tested as an anode for sodium ion batteries, this PSC delivers a high reversible capacity of 513.8 mA h g−1 at 100 mA g−1, excellent rate capability of 181.8 mA h g−1 at 10 A g−1 and superior cycling stability with a capacity of 290.1 mA h g−1 after 1000 cycles at 1 A g−1.

Graphical abstract: Enhanced Na+ pseudocapacitance in a P, S co-doped carbon anode arising from the surface modification by sulfur and phosphorus with C–S–P coupling

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Publication details

The article was received on 21 Oct 2019, accepted on 28 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9TA11594C
J. Mater. Chem. A, 2020, Advance Article

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    Enhanced Na+ pseudocapacitance in a P, S co-doped carbon anode arising from the surface modification by sulfur and phosphorus with C–S–P coupling

    J. Yan, W. Li, P. Feng, R. Wang, M. Jiang, J. Han, S. Cao, K. Wang and K. Jiang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA11594C

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