Sustainable S cathodes with synergic electrocatalysis for room-temperature Na-S batteries
- Publisher:
- Royal Society of Chemistry
- Publication Type:
- Journal Article
- Citation:
- Journal of Materials Chemistry A, 2021, 9, (1), pp. 566-574
- Issue Date:
- 2021-01-07
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A novel sulfiphilic host is reported with single Co atoms (Co1) and ZnS quantum dots (ZnS-QDs) (∼10 nm) grown in N-doped carbon microparticles. The introduction of Co cations into the precursor is crucial, because it leads to the dispersion of single-atom Co on the carbon matrix, decreasing the size and improving the dispersion of the resultant ZnS-QDs as well. Benefitting from the resilient and stable carbon framework, the single-atom Co and small ZnS-QDs synergically electro-catalyze the S redox process, which can greatly enhance sodium polysulfide conversion and reduction of non-conductive Na2S. The refined S cathode achieves remarkable cycling capability (640 mA h g-1 after 500 cycles at 0.1 A g-1), enhanced capacity retention, and outstanding energy density (541 W h kg-1), giving it great promise for scientific research and practical applications. This journal is
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