期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 24, 页码 20306-20312出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05178
关键词
Prussian blue analogue; TCNQ; electronic coupling; sodium ion batteries; fast kinetics
资金
- National Program on Key Basic Research Project of China [2014CB239701]
- National Natural Science Foundation of China [51372116, 51672128]
- Prospective Joint Research Project of Cooperative Innovation Fund of Jiangsu Province [BY2015003-7]
- Anhui Provincial Natural Science Foundation [KJ2016A092, 1708085QE115]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Outstanding Doctoral Dissertation in NUAA [BCXJ14-12]
- Jiangsu Innovation Program for Graduate Education [KYLX_0254, KYZZ16_0166]
- China Scholarship Council [201406830023]
Alternative battery systems based on the chemistry of sodium are being considered to offer sustainability and cost-effectiveness. Herein, a simple and new method is demonstrated to enable nickel hexacyanoferrate (NiHCF) Prussian blue analogues (PBA) nanocrystals to be an excellent host for sodium ion storage by functionalization with redox guest molecule. The method is achieved by using NiHCF PBA powders infiltrated with the 7,7,8,8-tetracyanoquinododimethane (TCNQ) solution. Experimental and ab initio calculations results suggest that TCNQ molecule bridging with Fe atoms in NiHCF Prussian blue analogue leads to electronic coupling between TCNQ molecules and NiHCF open-framework, which functions as an electrical highway for electron motion and conductivity enhancement. Combining the merits including high electronic conductivity, open framework structure, nanocrystal, and interconnected mesopores, the NiHCF/TCNQ shows high specific capacity, fast kinetics and good cycling stability, delivering a high specific capacity of 35 mAh g(-1) after 2000 cycles, corresponding a capacity loss of 0.035% decay per cycle.
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