[논문]양극산화 조건에 따른 이산화티타늄 나노튜브의 광촉매 및 광전기화학적 특성

김연진; 정린; 이재원; 유정은; 이기영

doi:10.5695/jsse.2023.56.2.137

양극산화 조건에 따른 이산화티타늄 나노튜브의 광촉매 및 광전기화학적 특성
Photocatalytic and photoelectrocatalytic properties of anodic titanium dioxide nanotubes based on anodizing conditions 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.56 no.2, 2023년, pp.137 - 146

김연진 (인하대학교 화학.화학공학융합학과) , 정린 (인하대학교 화학.화학공학융합학과) , 이재원 (인하대학교 화학.화학공학융합학과) , 유정은 (인하대학교 화학.화학공학융합학과) , 이기영 (인하대학교 화학.화학공학융합학과)

Abstract ▼ AI-Helper

Nanosized TiO2 has been widely investigated in photoelectrochemical or photocatalytic applications due to their intrinsic properties such as suitable band position, high photocorrosion resistance, and surface area. In this study, to achieve the high efficiency in photoelectrochemical and photocatalytic performance, TiO2 nanotubular structures were formed by anodization at various temperatures and times. The morphological and crystal structure of the anodized TiO2 nanotubes (NTs) were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The photoelectrochemical (PEC) properties and incident photon-to-current conversion efficiency (IPCE) of the TiO2 NTs were studied with different lengths and morphologies. From the detailed investigations, the optimum thickness of TiO2 nanotubes was 3 ㎛. Moreover, we found that the optimum photocatalytic pollutant removal efficiency of TiO2 nanotubes for photodegradation of Rhodamine B (RhB) under simulated solar light was 5.34 ㎛ of tube length.

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표/그림 (8)

그림 Fig.1. SEM images of TiO₂ nanotubes anodized at 30 V, for (a) 5 min, (b) 10 min, (c) 30 min, (d) 70 min at RT; (e) 50 ℃ for 58 min, (f) at 70 ℃ for 9 min, and (g) at 60 V, RT for 7 min. (h) Outer diameter diagram of 3 ㎛ thick TiO₂ nanotubes with different anodizing conditions.
그림 Fig. 2. (a, b) Current density vs time (j-t) curves for 3 ㎛ thick TiO₂ nanotubes formed at different temperatures and voltages. (b) shows onset of the beginning stage of anodization, the inset represents typical current density curve for metal oxide during anodization. The dotted green lines on I-t curves of 30V-50-58 and 30V-70-9 divide anodization process Ⅰ, Ⅱ and Ⅲ regarding the inset of Figure 2b.
표 Table 1. The thickness, diameter, and photocurrent density of TiO₂ nanotubes formed at different anodizing conditions.
그림 Fig. 3. XRD patterns of the 3 ㎛ thick TiO₂ nanotubes after heat-treatment in air at 450 ℃ for 1 h. A: Anatase, T: Ti
그림 Fig. 4. Chopped photocurrent density transient of TiO₂ nanotubes formed at 30 V or 60 V, RT, for (a) 5, (b) 10, (c) 30, (d) 60, (e) 70, and (f) 120, 180 minutes.
그림 Fig. 5. (a) Chopped photocurrent density transient of 3 ㎛ TiO₂ nanotubes formed under different applied voltages, temperatures, and anodizing time. (b) IPCE spectra and bandgap evaluation of the 3 ㎛ TiO₂ nanotubes.
그림 Fig. 6. (a) UV-vis absorbance spectrum of RhB photodegradation by TiO₂ nanotubes anodized at 30 V, RT for 3 h. Concentration of RhB after photodegradation using (b) the 3 ㎛ thick TiO₂ nanotubes, and (c) different thickness of TiO₂ nanotubes anodized at 30 V, RT.
표 Table 2. The table of bandgap energy of the 3 ㎛ TiO₂ nanotubes

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