Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 12, Pages 3779-3783Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201812062
Keywords
electrocatalysis; lithium-sulfur batteries; metal nitrides; polysulfide redox reaction; separators
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Funding
- National Key Research and Development Program [2016YFA0202500, 2016YFA0200102]
- National Natural Science Foundation of China [21776019, 21676160]
- Beijing Key Research and Development Plan [Z181100004518001]
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Surface reactions constitute the foundation of various energy conversion/storage technologies, such as the lithium-sulfur (Li-S) batteries. To expedite surface reactions for high-rate battery applications demands in-depth understanding of reaction kinetics and rational catalyst design. Now an in situ extrinsic-metal etching strategy is used to activate an inert monometal nitride of hexagonal Ni3N through ironincorporated cubic Ni3FeN. In situ etched Ni3FeN regulates polysulfide-involving surface reactions at high rates. Electron microscopy was used 10 unveil the mechanism of in situ catalyst transformation. The Li-S batteries modified with Ni3FeN exhibited superb rate capability, remarkable cycling stability at a high sulfur loading of 4.8 mgcm(-2), and lean-electrolyte operability. This work opens up the exploration of multimetallic alloys and compounds as kinetic regulators for highrate Li-S batteries and also elucidates catalytic surface reactions and the role of defect chemistry.
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