Electrochemical release of catalysts in nanoreactors for solid sulfur redox reactions in room-temperature sodium-sulfur batteries
| Autor: | Weihong Lai, Jian Peng, Akhil Tayal, Hua-Kun Liu, Zichao Yan, Shulei Chou, Wanlin Wang, Weibo Hua, Jian Liu, Yunxiao Wang, Gao Qing Lu, Yaru Liang, Zhe Hu, Lingyan Jing, Qiang Tian, Shi Xue Dou |
|---|---|
| Přispěvatelé: | Lu, Gao-Qing |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science Physics QC1-999 General Engineering Nucleation General Physics and Astronomy chemistry.chemical_element General Chemistry Nanoreactor Electrocatalyst Electrochemistry Sulfur Redox Catalysis chemistry.chemical_compound General Energy chemistry Chemical engineering ddc:530 General Materials Science ddc:600 Polysulfide |
| Zdroj: | Cell Reports Physical Science, Vol 2, Iss 8, Pp 100539-(2021) Cell reports 2(8), 100539 (2021). doi:10.1016/j.xcrp.2021.100539 Cell reports, 2 (8), Art.Nr.: 100539 |
| ISSN: | 2666-3864 |
| DOI: | 10.1016/j.xcrp.2021.100539 |
| Popis: | Cell reports 2(8), 100539 (2021). doi:10.1016/j.xcrp.2021.100539 Electrocatalysis-assisted entrapment of polysulfide while ensuring efficient nucleation of Na$_2$S holds the key to addressing the shuttle effect and sluggish kinetics of polysulfide in room-temperature (RT) Na/S batteries. The constrained active sites, however, dramatically limit the efficiency of electrocatalysts. Here, a strategy of electrochemically releasing nano-silver catalytic sites during the discharge process is presented, visualized, and implemented for accelerated Na$_2$S nucleation. Because of the effective polysulfide immobilization and accelerated Na$_2$S nucleation, the sulfur cathode, supported by a self-released silver electrocatalyst, exhibits a superior reversible capacity of 701 mAh g$^{���1}$ at 0.1 A g$^{���1}$ and an ultra-stable cycling performance. Precise understanding of the electrochemically self-releasing mechanism and the catalysis in Na$_2$S nucleation via in situ transmission electron microscopy (TEM) would aid, however, in fundamentally optimizing the working mechanism and for further development of more stable high-power RT Na/S batteries. Published by Elsevier, [New York, NY] |
| Databáze: | OpenAIRE |
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