The effect of introduced method of titania and applied potential on the photoelectrocatalytic properties of CNT/TiO2 electrodes
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In this paper, three types of CNT/TiO2 composite electrodes were prepared with different methods. The changes in XRD patterns showed that the Electrode A contained a mixed phase of anatase and rutile while the Electrode B and Electrode C contained a typical single and clear anatase crystal structure. From SEM micrographs, TiO2 particles were adhered on the surface of the CNT network in the forms of small clusters. The results of chemical elemental analysis indicated that the main elements such as C, O and Ti were existed. The results demonstrated that the efficiency of photoelectrocatalytic (PEC) oxidation for methylene blue (MB) was higher than that of photocatalytic (PC) oxidation. There was a clear enhancement trend of the MB degradation using the prepared CNT/TiO2 composite electrodes with an increase of applied potential. Finally, the prominent PEC activities of the CNT/TiO2 composites could be attributed to combination effects of photo-degradation of TiO2, electron assistant of CNT and function of applied potential.
Abstract
In this paper, three types of CNT/TiO2 composite electrodes were prepared with different methods. The changes in XRD patterns showed that the Electrode A contained a mixed phase of anatase and rutile while the Electrode B and Electrode C contained a typical single and clear anatase crystal structure. From SEM micrographs, TiO2 particles were adhered on the surface of the CNT network in the forms of small clusters. The results of chemical elemental analysis indicated that the main elements such as C, O and Ti were existed. The results demonstrated that the efficiency of photoelectrocatalytic (PEC) oxidation for methylene blue (MB) was higher than that of photocatalytic (PC) oxidation. There was a clear enhancement trend of the MB degradation using the prepared CNT/TiO2 composite electrodes with an increase of applied potential. Finally, the prominent PEC activities of the CNT/TiO2 composites could be attributed to combination effects of photo-degradation of TiO2, electron assistant of CNT and function of applied potential.
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