Journal
CHEMELECTROCHEM
Volume 3, Issue 6, Pages 871-876Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201600078
Keywords
anatase titania; electrode materials; layer-stacked nanostructures; lithium-ion batteries; oxidation
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Funding
- Scientific Research Foundation for Returned Scholars, Ministry of Education of China
- Key Basic Research Projects of Science and Technology Commission of Shanghai [11JC1412900]
- National Science Foundation of China program [21271140, 51472182]
- Fundamental Research Funds for the Central Universities
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Layer-stacked anatase titania (a-TiO2) was synthesized with two-step oxidation of MXene (Ti3C2Tx, T=O, OH, or F). Compared with direct oxidation of MXene in air, the two-step oxidation process involving additional hydrothermal pre-oxidation could alleviate the anomalous grain growth of TiO2, and largely keep the fine structure of MXene. The layered structure derived from MXene enabled the synthesized a-TiO2 to exhibit superior electrochemical properties. Its discharge capacities reached 241.9 and 131.1 mAhg(-1) at the current rates of 0.3 and 12 C, respectively. Even after 10000 cycles at 6 C, its capacity remained at 107.1 mAhg(-1), which is approximately 70% of the initial capacity. Cyclic voltammetry analysis showed that both diffusive lithium storage in the bulk and interfacial (pseudocapacitive) lithium storage at the surface of layer-stacked a-TiO2 contributed to its electrochemical properties.
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