Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 123, Issue 12, Pages 7025-7032Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.9b00213
Keywords
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Funding
- National Natural Science Foundation of China [21401117]
- NSF of Shandong Province [JQ201804]
- Fundamental Research Funds of Shandong University [2018JC026]
- Taishan Scholarship in Shandong Province [ts201511004]
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By aerobic calcination of a new titanium-oxide cluster (TOC) isolated from water, that is, [Ti6O8(OH2)(20)]center dot(2,7-NDS)(4)center dot 2HCl-14H(2)O (Ti-6-NDS; 2,7-NDS = 2,7-naphthalenedisulfonate), porous anatase TiO2 was facially prepared. The sample obtained at 400 degrees C exhibited a surface area of 108 cm(3)g(-1) and an average pore diameter of 16 nm. When used as an anode material for a sodium-ion battery (SIB), it showed larger specific capacity and far superior rate performance than the other TiO2 samples, including those prepared from another three TOCs under the same conditions or from Ti-6-NDS under different conditions and the one obtained from a commercial source. The mechanistic study indicates that the hierarchical structure surrounding the Ti-oxide cores of Ti-6-NDS is pivotal for the formation and the SIB performance of the porous TiO2. This surfactant-free and catalyst-free strategy for the fabrication of TiO2 materials with special morphologies by thermal transformation of a TOC provides a new optional protocol for the preparation of promising materials stable and efficient in SIBs.
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