Zong, W;
Lai, F;
He, G;
Feng, J;
Wang, W;
Lian, R;
Miao, Y-E;
... Liu, T; + view all
(2018)
Sulfur-Deficient Bismuth Sulfide/Nitrogen-Doped Carbon Nanofibers as Advanced Free-Standing Electrode for Asymmetric Supercapacitors.
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, Article 1801562. 10.1002/smll.201801562.
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Abstract
The use of free‐standing carbon‐based hybrids plays a crucial role to help fulfil ever‐increasing energy storage demands, but is greatly hindered by the limited number of active sites for fast charge adsorption/desorption processes. Herein, an efficient strategy is demonstrated for making defect‐rich bismuth sulfides in combination with surface nitrogen‐doped carbon nanofibers (dr‐Bi2S3/S‐NCNF) as flexible free‐standing electrodes for asymmetric supercapacitors. The dr‐Bi2S3/S‐NCNF composite exhibits superior electrochemical performances with an enhanced specific capacitance of 466 F g−1 at a discharge current density of 1 A g−1. The high performance of dr‐Bi2S3/S‐NCNF electrodes originates from its hierarchical structure of nitrogen‐doped carbon nanofibers with well‐anchored defect‐rich bismuth sulfides nanostructures. As modeled by density functional theory calculation, the dr‐Bi2S3/S‐NCNF electrodes exhibit a reduced OH− adsorption energy of ‐3.15 eV, compared with that (–3.06 eV) of defect‐free bismuth sulfides/surface nitrogen‐doped carbon nanofiber (df‐Bi2S3/S‐NCNF). An asymmetric supercapacitor is further fabricated by utilizing dr‐Bi2S3/S‐NCNF hybrid as the negative electrode and S‐NCNF as the positive electrode. This composite exhibits a high energy density of 22.2 Wh kg−1 at a power density of 677.3 W kg−1. This work demonstrates a feasible strategy to construct advanced metal sulfide‐based free‐standing electrodes by incorporating defect‐rich structures using surface engineering principles.
| Type: | Article |
|---|---|
| Title: | Sulfur-Deficient Bismuth Sulfide/Nitrogen-Doped Carbon Nanofibers as Advanced Free-Standing Electrode for Asymmetric Supercapacitors |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/smll.201801562 |
| Publisher version: | http://doi.org/10.1002/smll.201801562 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | asymmetric supercapacitors, bismuth sulfides, free‐standing, nitrogen‐doped carbon nanofibers, sulfur deficiency |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10056362 |
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