Journal
SMALL
Volume 15, Issue 34, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201902431
Keywords
catalytic oxidation; lithium-sulfur batteries; nanoreactors; polysulfide conversion; synergic effects
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Funding
- Changjiang Scholars Program [T2012049] Funding Source: Medline
- Fundamental Research Funds for the Central Universities [DUT18JC14] Funding Source: Medline
- Natural Science Foundation of China [21476044, 21706023, 21506028, 21676043] Funding Source: Medline
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Reducing the deposit of discharge products and suppressing the polysulfide shuttle are critical to enhancing reaction kinetics in Li-S batteries. Herein, a Pt@Ni core-shell bimetallic catalyst with a patch-like or complete Ni shell based on a confined catalysis reaction in porous carbon spheres is reported. The Pt nanodots can effectively direct and catalyze in situ reduction of Ni2+ ions to form core-shell catalysts with a seamless interface that facilitates the charge transfer between the two metals. Thus, the bimetallic catalysts offer a synergic effect on catalyzing reactions, which shows dual functions for catalytic oxidation of insoluble polysulfides to soluble polysulfides by effectively reducing the energy barrier with simultaneous strong adsorption, ensuring a high reversible capacity and cycling stability. A novel process based on the Pt@Ni core-shell bimetallic catalyst with a patch-like Ni shell is proposed: electronic migration from Ni to Pt forces Ni to activate Li2S2/Li2S molecules by promoting the transformation of Li-S-Li to Ni-S-Li, consequently releasing Li+ and free electrons, simultaneously enhancing protonic/electronic conductivity. The presence of the intermediate state Ni-S-Li is more active to oxidize Li2S to polysulfides. The Li2S bound to adjacent Pt sites reacts with abundant -S-Li species and then releases the Pt sites for the next round of reactions.
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