Issue 3, 2019

Metal chelate induced in situ wrapping of Ni3S2 nanoparticles into N, S-codoped carbon networks for highly efficient sodium storage

Abstract

Carbon-confined transition metal sulfides (TMS@C), featured with excellent redox reversibility, good electrical conductivity and high theoretical capacity, are considered to be promising anode materials for sodium-ion batteries (SIBs). Unfortunately, a large amount of additional S sources are involved in traditional preparation strategies, such as S powder, thiourea, L-cysteine, etc., resulting in the release of dangerous and poisonous H2S or residues of free S in final products. Therefore, developing a facile approach for eco-friendly synthesis of TMS@C remains a big challenge. Herein, a novel approach is developed to realize the facile fabrication of TMS@C from metal-dithiooxamide chelate (MDC) without additional S sources, which effectively reduces the release of H2S and avoids the residue of free S. In this strategy, dithiooxamide (DTO) with superior coordination ability coordinates with Ni2+ for the fine generation of the Ni-MDC precursor that is converted to N, S-codoped carbon-confined Ni3S2 nanoparticles (Ni3S2@NSC) after an in situ self-carbonization and self-sulfidation process. Benefiting from the rich heteroatoms in DTO, high doping contents of N and S in the carbon matrix can be obtained. When evaluated as an anode material for SIBs, Ni3S2@NSC exhibits excellent sodium storage performance with high reversible capacity (458.1 mA h g−1 after 100 cycles at 0.1 A g−1), superior rate capability (323.3 mA h g−1 at 2 A g−1) and robust long-term cycling stability (392.6 mA h g−1 after 300 cycles at 0.5 A g−1), which outperform those of nickel sulfide-based electrodes reported so far. More importantly, the strategy by employing MDC as a versatile precursor and template in this work should be promisingly applied in the fabrication of other heteroatom-doped TMS@C for efficient energy storage and conversion.

Graphical abstract: Metal chelate induced in situ wrapping of Ni3S2 nanoparticles into N, S-codoped carbon networks for highly efficient sodium storage

Supplementary files

Article information

Article type
Research Article
Submitted
11 Dec 2018
Accepted
20 Jan 2019
First published
21 Jan 2019

Inorg. Chem. Front., 2019,6, 694-704

Metal chelate induced in situ wrapping of Ni3S2 nanoparticles into N, S-codoped carbon networks for highly efficient sodium storage

J. Li, J. Li, T. Chen, T. Lu, W. Mai and L. Pan, Inorg. Chem. Front., 2019, 6, 694 DOI: 10.1039/C8QI01326H

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