Journal
CHEMELECTROCHEM
Volume 6, Issue 22, Pages 5642-5650Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201901517
Keywords
sodium-ion batteries; self-supporting; tin selenide nanosheets; bovine serum albumin; pseudocapacitance
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A self-supporting electrode composed of carbon-coated tin selenide nanosheets, thermally treated protein, and reduced graphene oxide was prepared for sodium-ion batteries via a protein-assisted self-assembly, cost-efficient vacuum filtration, and subsequent low-temperature annealing. During this process, the hierarchical three-dimensional framework has been achieved, in which tin selenide nanosheets consisted of nanocrystals with diameter of about 5 nm, and confined in a highly conductive interconnected reduced graphene oxide network by thermally treated bovine serum albumin. The unique structure not only promises structural stability and the reaction kinetics of the electrode during charge-discharge process, but also possesses substantial interfacial sites for Na+ redox reaction giving rise to additional pseudocapacitance. Therefore, the self-supporting composite as anode exhibits an outstanding capacity of 617.5 mA h g(-1) at 0.1 A g(-1), high rate capability of 213.8 mA h g(-1) at 5 A g(-1), and superior cyclic performance of 503.9 mA h g(-1) at 0.1 A g(-1) after 100 cycles. Therefore, the electrode materials have large potential in advanced sodium-ion batteries in portable, flexible, and wearable electronics.
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