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首页> 外文会议>International Symposium on Energy and Electrochemical Processes for a Cleaner Environment, 2001, San Francisco, CA >Si/BDD/TiO_2 ANODES: MORPHOLOGY AND EFFICIENCY FOR THE (PHOTO)OXIDATION OF OXALIC ANIONS
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Si/BDD/TiO_2 ANODES: MORPHOLOGY AND EFFICIENCY FOR THE (PHOTO)OXIDATION OF OXALIC ANIONS

机译：Si / BDD / TiO_2阳极：草酸阴离子（光）氧化的形貌和效率

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摘要

The deposits of TiO_2 ceramics onto boron doped diamond films (Si/BDD) lead to a novel electrode material which is more efficient than Si/BDD itself for the abatement of the oxalic acid, one of the pollutants hardly oxidized on the diamond films alone. The accumulation of the highly oxidizing species such as OH~. at the surface of TiO_2 layer may explain the increased current efficiency (ICE 100% instead of 70%) observed for concentrate (1M) oxalic acid solutions studied in the dark. However, in the case of the ICE values close to 100% obtained for 0.5 M oxalic acid, the photochemical effect due to the UV irradiation is negligible compared to the electrochemical abatement of oxalic anions. In contrast, for 0.0625 M oxalic acid, when mass transfer problems are leading to a significant decrease (up to 70%) of the electrical efficiency, the role of the TiO_2 layer can be observed under UV irradiation conditions (ICE increase up to 90%). This can be both explained by the photo-Kolbe effect which favours the evolution of CO_2 and also by a higher local concentration of the highly oxidizing OH~. radicals issued from the photo-produced holes .
机译：TiO_2陶瓷在硼掺杂金刚石薄膜（Si / BDD）上的沉积导致了一种新型电极材料，该材料比Si / BDD本身更有效地减少了草酸，草酸是仅在金刚石薄膜上很难被氧化的一种污染物。高氧化性物质（例如OH〜）的积累。 TiO_2层表面上的碳纳米管可以解释在暗处研究的浓缩液（1M）草酸溶液中观察到的电流效率提高（ICE 100％代替70％）。然而，在0.5M的草酸获得的ICE值接近100％的情况下，与草酸阴离子的电化学消除相比，由于UV辐射引起的光化学作用可以忽略。相反，对于0.0625 M的草酸，当传质问题导致电效率显着下降（最高70％）时，可以在紫外线照射条件下观察到TiO_2层的作用（ICE最高上升90％）。 ）。这既可以通过有利于CO_2放出的光柯尔贝效应进行解释，也可以通过高氧化性OH〜的较高局部浓度来解释。由照片产生的孔发出的自由基。

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