《Table 1Phase structure of HT-T series photocatalysts.》

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《基于表面优先型相变过程构建TiO_2(B)/锐钛矿异相结纳米纤维及其光催化性能（英文）》

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A:anatase；B:Ti O2（B）.

Based on the standard XRD patterns（Fig.S2）and UV-Raman spectra（Fig.S3），the ratios of Ti O2（B）and anatase in the bulk structure and on the surface structure of the HT–T series of photocatalysts were calculated.As shown in Table 1，as the temperature is increased from 400 to 700°C，the ratio of Ti O2（B）in the bulk structure of the photocatalyst gradually decreases from 100%to 0%.However，on the surface region，it quickly decreases to 0%at 610°C.The above results show the unsynchronizedTi O2（B）-to-anatasephase-transformation process in the bulk and on the surface，and reveal that this phase transformation is a surface-preferred process.Combined with the SEM observations，the faster phase-transformation process on the surface region may due to the partial skeletal collapse of Ti O2（B）.The collapsed region of the sample transforms into anatase and splits the material at the same time.This region will actually become the new surface of the material，thus increasing the content of anatase on the surface.Based on the above results，a model of for the temperature-dependent phase transformation process was proposed（Scheme 1），where the rate of phase transformation in the surface region（Scheme 1 （a）） is faster than that in the bulk region（Scheme1 （b）） .Taken together，the Ti O2（B）/anatase-interfacial hetero-structures in nanowires possess higher anatase contents on the surface than in the bulk.