期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 46, 页码 24558-24565出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202109291
关键词
dynamic evolution; Li-S batteries; molybdenum; precatalyst; Se vacancies
资金
- National Natural Science Foundation of China [51702225]
- Suzhou Science and Technology Project-Prospective Application Research Program [SYG202038]
- Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Suzhou, China
This study presents a novel catalyst SeVs-MoSe2 and investigates its performance in Li-S batteries, demonstrating that the MoSeS catalyst can enhance battery performance. The work provides important insights for designing efficient electrocatalysts.
Witnessing compositional evolution and identifying the catalytically active moiety of electrocatalysts is of paramount importance in Li-S chemistry. Nevertheless, this field remains elusive. We report the scalable salt-templated synthesis of Se-vacancy-incorporated MoSe2 architecture (SeVs-MoSe2) and reveal the phase evolution of the defective precatalyst in working Li-S batteries. The interaction between lithium polysulfides and SeVs-MoSe2 is probed to induce the transformation from SeVs-MoSe2 to MoSeS. Furthermore, operando Raman spectroscopy and ex situ X-ray diffraction measurements in combination with theoretical simulations verify that the effectual MoSeS catalyst could help promote conversion of Li2S2 to Li2S, thereby boosting the capacity performance. The Li-S battery accordingly exhibits a satisfactory rate and cycling capability even with and elevated sulfur loading and lean electrolyte conditions (7.67 mg cm(-2); 4.0 mu L mg(S)(-1)). This work elucidates the design strategies and catalytic mechanisms of efficient electrocatalysts bearing defects.
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