Abstract
Catalytic conversion of polysulfides is regarded as a crucial approach to enhancing kinetics and suppressing the shuttle effect in lithium–sulfur (Li–S) batteries. However, the activity prediction of Li–S catalysts remains elusive owing to the lack of mechanistic understanding of activity descriptors. Here, we report a volcano-shaped relationship between polysulfide adsorption ability and catalytic activity. In conjunction with theoretical analysis, we distinguish catalytic and anchoring effects to delineate the role of adsorption and emphasize the passivation of catalysts. These findings enable us to develop a composite catalyst, Co0.125Zn0.875S, which shows higher performance than simple binary compounds. Such a fundamental understanding of the intrinsic link between polysulfide adsorption and catalytic activity offers a rational viewpoint for designing Li–S catalysts and tuning their activities.
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Acknowledgements
We acknowledge the financial support of the National Key Research and Development Program of China (2020YFA0406104) and the National Natural Science Foundation of China (22075131). The numerical calculations were carried out at the computing facilities in the High-Performance Computing Center (HPCC) of Nanjing University. Work at Argonne National Laboratory was supported by the US Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office under the US-China Clean Energy Research Center (CERC-CVC2) programme. Argonne National Laboratory is operated for the DOE Office of Science by UChicago Argonne, LLC, under contract number DE-AC02-06CH11357.
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H.Z. and Z.S. conceived the idea and designed the project. Z.S., X.J. and J.T. performed the catalyst synthesis and carried out the electrochemical experiments. Z.S., M.L., Y.Y. and S.Z. conducted the morphology and structural characterizations. Z.S., H.Z. and X.J. conducted the DFT calculations and microkinetic modelling. S.F., X.F., W.X. and H.L. assisted with the the ex situ Raman measurements and analysed the spectra. H.Z. and J.L. supervised the project and wrote the manuscript. All authors analysed the data and discussed the results.
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Nature Catalysis thanks Mahbub Islam, Harry Hoster and Qianfan Zhang for their contribution to the peer review of this work.
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Atomic coordinates in the used models
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UV–vis spectra and calculation results.
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Shen, Z., Jin, X., Tian, J. et al. Cation-doped ZnS catalysts for polysulfide conversion in lithium–sulfur batteries. Nat Catal 5, 555–563 (2022). https://doi.org/10.1038/s41929-022-00804-4
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DOI: https://doi.org/10.1038/s41929-022-00804-4