Journal
NANO ENERGY
Volume 21, Issue -, Pages 71-79Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.12.003
Keywords
Elastin-like polypeptides; 3D nanostructure; Metal oxides; Anode; Sodium ion battery
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Funding
- Nanyang Technological University, Singapore [RG41]
- IGS-NEWRI scholarship
- Singapore MOE AcRF Tier 1 grant [RG2/13]
- Automotive CRC 2020 [1-111]
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Transitional metal oxides are promising anode materials for sodium ion batteries (SIBS) due to their high theoretical capacities and material abundance; however, their sodium storage capability is significantly hindered by the sluggish sodiation/desodiation reaction kinetics. Herein, towards achieving fast and durable sodiation/desodiation reaction, Fe3O4 and Co3O4 nanocrystals encapsulated in carbon micro-spheres are synthesized via a biochemistry approach using recombinant elastin-like polypeptides containing hexahistidine tag (ELP16-His) followed by annealing. Fe3O4 and Co3O4 nanocrystals of approximately 5 nm in size, which are uniformly dispersed in a carbon matrix, are obtained. The carbon-encapsulated metal oxides exhibit encouraging sodium storage capacities (657 and 246 mA h g(-1) at 0.1 and 2 A g(-1), respectively, for carbon-encapsulated Fe3O4; 583 and 183 mA h g(-1) at 0.1 and 2 A g(-1), respectively, for carbon-encapsulated Co3O4), and have a high capacity retention after 100 cycles at 0.5 A g(-1). The superior electrochemical properties of thecarbon-encapsulated metal oxide nanocrystals demonstrate their potential for use as anode materials for high-capacity, high-rate and durable sodium storage. (C) 2016 Elsevier Ltd. All rights reserved.
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