Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 10, Issue 16, Pages 8958-8965Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta00269h
Keywords
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Funding
- National Natural Science Foundation of China [51972121, 21671069, 12174119]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011502]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2017TQ04C419]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation [pdjh2021a0072]
- Science and Technology Planning Project of Guangzhou City [202007020005]
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By introducing oxygen-containing functional groups to enhance the interaction between carbon aerogel and metal chalcogenides, an optimized CA/MC interface has been achieved, resulting in synthesized composites showing outstanding potassium-ion storage and electrochemical kinetic properties.
Intimately coupling metal chalcogenides (MCs) with carbon materials is critical for boosting their application performances. However, since MCs and carbon materials are usually two types of incompatible materials, a non-uniform carbon/MC interface is easily formed, especially for multidimensional nanostructures. Herein, we propose an interfacial engineering strategy to enhance the interaction between a three-dimensional nanonetwork-structured carbon aerogel (CA) and MCs. The key to this strategy is the introduction of substantial oxygen-containing functional groups into the CA, which greatly improves its compatibility with MC precursors, and thus enables MCs to grow on the CA framework homogeneously. The optimized CA/MC interface enables extremely compact bonding interaction between the CA and MC nanosheets. Benefitting from a well-organized structure, the synthesized CA@MC composites show remarkable potassium-ion storage performances and electrochemical kinetic properties. As a demonstration, the CA@MoS2 composites show high reversible capacity (389 mA h g(-1) at 100 mA g(-1)), excellent rate performance (capacity retention exceeds 40% with a 5-fold increase of the current density) and an enhanced ion diffusion rate when used as an anode material for potassium-ion batteries.
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