A Study on the Photoanodic Properties of Heat-Formed Ti/TiO_2 Electrodes

加熱形成Ti/TiO_2電極之光陽極電流

洪崑煌(Kun-Huang Houng)

《中央研究院化學研究所集刊》 28期 (1981/03) Pp. 27-35

https://doi.org/10.6522/BICAS.1981.28.3

摘要

將金屬鈦陽極氧化，空中加熱氧化而得氧化鈦覆蓋鈦電極，經真空加熱使其具有半導體性質，而測定其光電化學電流。另在玻片上以化學蒸汽沉積法得氧化鈦薄膜電極，亦經真空加熱，使其具有半導體性質，做同樣測定。所得電極表現不同程度的光電流，但陽極反應主要仍是水的分解而生成氧氣，其他可被氧化之物種不易參與初級陽極反應。光電流強度與製作電極條件有關：900°C下氧化並在600°C真空處理者光電流最強，但暗電流亦高。在700°C下氧化短時間者光電流亦強，但暗電流則低。

並列摘要

Titanium oxide coated electrodes were prepared by anodizing titanium substrates or heating in air. The electrodes were vacuum heated to convert the surface oxides into semiconducting material. Titanium oxide films were also formed on glass plates by chemical vapor deposition, they were vacuum-heated to render semiconducting property. The semiconducting TiO_2 coated electrodes exhibited different degree of photoanodic current, but the main anodic reaction was the decomposition of water, other oxidizable species were not easily involved in the anodic oxidation. The photoanodic current density depended on the conditions of the electrode preparation: those formed at 900°C and vacuum heated at 600°C gave the highest phtoanodic current, but the dark current was also high. Those formed by heating shortly at 700°C also gave high photoanodic current, while the dark current was very low.