科研之友
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摘要
TiO2 nanocrystals in rutile, anatase and mixed phase were prepared from the titanium iso-propoxide precursor by employing a controlled amount of HCl as a peptizing agent along with the hydrothermal treatment without any surfactants at 100 degrees C, 150 degrees C and 200 degrees C for 10 h. The as obtained nanocrystals at 150 degrees C (NP150) is found to be shorter nanorods with an average diameter of similar to 12 nm and length of similar to 32 rim showing a typical anatase characteristics with 2 theta peak positions at 25.27 degrees, 37.80 degrees, 48.09 degrees, 54.02 degrees 54.77 degrees, 62.80 degrees, 69.16 degrees and 70.17 degrees. However, the 100 degrees C and 200 degrees C samples with same reaction protocol produces only aggregated nanoparticles with a rutile and a mixed anatase/rutile crystal phases, respectively. The as obtained shorter nanorod structures when processed for the electrochemical test as anode materials in lithium ion battery shows an excellent first and second discharge capacities of 366 and 182 mAhg(-1) with a plateau of 1.72 V, much higher than those of nanoparticle (100 degrees C and 200 degrees C). The enhanced capacity could be attributed to the defect free, anatase crystal phase, stable morphology, high surface area and an enhanced conductivity due to the nanorods morphology which could effectively withstand expansion/contraction occurring during the successive lithium ion insertion/extraction process.
- 出版日期2017-8-15
