期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102995
关键词
crystal facet engineering; electrocatalysis; Li-S batteries; redox kinetics; SnO; (2) nanocrystals
类别
资金
- National Natural Science Foundation of China [22078078]
- Natural Science Foundation of Heilongjiang Province [LH2020B008]
- State Key Laboratory of Urban Water Resource and Environment
- Harbin Institute of Technology [2019DX13]
Controlling exposed crystal facets through crystal facet engineering is effective in enhancing the catalytic activity of nanocrystalline catalysts. The synthesis of active SnO2 nano-octahedra enclosed by {332} crystal facets demonstrates powerful chemisorption and catalytic ability, improving the redox kinetics of sulfur species in lithium-sulfur chemistry. Crystal facet engineering is a promising strategy for optimizing catalyst performance and aiding in the rational design of advanced sulfur electrodes.
Controlling exposed crystal facets through crystal facet engineering is an efficient strategy for enhancing the catalytic activity of nanocrystalline catalysts. Herein, the active tin dioxide nano-octahedra enclosed by {332} crystal facets (SnO2 {332}) are synthesized on reduced graphene oxide and demonstrate powerful chemisorption and catalytic ability, accelerating the redox kinetics of sulfur species in lithium-sulfur chemistry. Attributed to abundant unsaturated-coordinated Sn sites on {332} crystal planes, SnO2 {332} has outstanding adsorption and catalytic properties. The material not only adsorbs and converts polysulfides efficiently, but also prominently lowers the decomposition energy barrier of Li2S. The batteries with these high active electrocatalysts exhibit excellent cycling stability with a low capacity attenuation of 0.021% every cycle during 2000 cycles at 2 C. Even with a sulfur loading of 8.12 mg cm(-2), the batteries can still cycle stably and maintain a prominent areal capacity of 6.93 mAh cm(-2) over 100 cycles. This research confirms that crystal facet engineering is a promising strategy to optimize the performance of catalysts, deepens the understanding of surface structure-oriented electrocatalysis in Li-S chemistry, while aiding the rational design of advanced sulfur electrodes.
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