Issue 31, 2023

N and S co-doped nanosheet-like porous carbon derived from sorghum biomass: mechanical nanoarchitecturing for upgraded potassium ion batteries

Abstract

In this study, nanosheet-like sorghum biomass is obtained by a mild alkaline treatment and high-energy ball milling. N, S co-doped hard carbon (NSSC) with the nanosheet morphology is subsequently synthesized by a direct-carbonization of the nanosheet-like sorghum biomass mixed with thiourea. NSSCs obtained at various annealing temperatures demonstrate that the optimal annealing temperature is necessary to balance the efficient heteroatom-doping and the level of carbonization. NSSC-600 obtained at the optimized annealing temperature of 600 °C presents a great K-ion storage performance as an anode material with a high reversible specific capacity of 268 mA h g−1 at 100 mA g−1 and outstanding stability over 2400 cycles. The effect of N and S heteroatom-doping on K-ion adsorption capacity is also verified by density functional theory (DFT) calculations.

Graphical abstract: N and S co-doped nanosheet-like porous carbon derived from sorghum biomass: mechanical nanoarchitecturing for upgraded potassium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
31 5 2023
Accepted
16 6 2023
First published
27 7 2023

J. Mater. Chem. A, 2023,11, 16626-16635

Author version available

N and S co-doped nanosheet-like porous carbon derived from sorghum biomass: mechanical nanoarchitecturing for upgraded potassium ion batteries

M. Kim, L. Ma, Z. Li, W. Mai, N. Amiralian, A. E. Rowan, Y. Yamauchi, A. Qin, R. A. Afzal, D. Martin, A. K. Nanjundan and J. Li, J. Mater. Chem. A, 2023, 11, 16626 DOI: 10.1039/D3TA03215A

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