Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6613985 | Electrochimica Acta | 2014 | 7 Pages |
Abstract
In the present study, a nanocrystalline GeO2/C core shell was synthesized by a cost-effective and simple citric-gel method for various parameters, and the effects of these parameters on the microstructural and electrochemical properties of the GeO2/C core shell were investigated. Thermo-gravimetric-analysis showed that the combustion of gel-complexes occurred in the temperature range from 178 to 247 °C. Among the samples pre-heated at 150 °C, the sample pre-heated for 4 h had the highest surface area (11.12 m2 gâ1; particle size â¼ 30 nm). TEM analysis revealed that the citric-gel synthesized GeO2 was encapsulated with carbon. This carbon encapsulation acted as a critical buffer layer against capacity degradation in the fabricated electrodes. The optimized sample showed a specific capacity of 738 mA h gâ1 and maintained its reversibility after 50 cycles at a capacity of 697 mA h gâ1. The electrode containing the optimized sample showed a reversible capacity of 530 mA h gâ1 at 1 C rate
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Duc Tung Ngo, Ramchandra S. Kalubarme, M.G. Chourashiya, Choong-Nyeon Park, Chan-Jin Park,