Journal
NPG ASIA MATERIALS
Volume 10, Issue -, Pages 429-440Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41427-018-0049-y
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Funding
- National Materials Genome Project [2016YFB0700600]
- National Natural Science Foundation Committee of China [51425301, U1601214, 51502137, 51573013]
- Jiangsu Distinguished Professorship Program
- Deutsche Forschungsgemeinschaft (DFG) [WE 5837/1-1]
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The development of sodium (Na) ion capacitors marks the beginning of a new era in the field of electrochemical capacitors with high-energy densities and low costs. However, most reported negative electrode materials for Na+ storage are based on slow diffusion-controlled intercalation/conversion/alloying processes, which are not favorable for application in electrochemical capacitors. Currently, it remains a significant challenge to develop suitable negative electrode materials that exhibit pseudocapacitive Na+ storage for Na ion capacitors. Herein, surface-controlled redox reaction-based pseudocapacitance is demonstrated in ultradispersed sub-10 nm SnO2 nanocrystals anchored on graphene, and this material is further utilized as a fascinating negative electrode material in a quasi-solid-state Na ion capacitor. The SnO2 nanocrystals possess a small size of < 10 nm with exposed highly reactive {221} facets and exhibit pseudocapacitive Na+ storage behavior. This work will enrich the methods for developing electrode materials with surface-dominated redox reactions (or pseudocapacitive Na+ storage).
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