Photoelectrochemical Properties of TiO_2 Coatings by LPC Plasma Spraying

LPC等离子喷涂TiO_2涂层的光电化学性能

• 批准号: 63550548
• 负责人: OHMORI Akira
• 金额: $ 1.22万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550548/
• 关键词: auxiliary gas; photocurrent; LPC plasma-sprayed coatings; plasma spraying; plasma gas; formation free energy; photoelectrochemical; ionized donor density concentration; 複合酸化物皮膜電極; Eg(エネルギーギャップ); N_D(ドナーデンシティー濃度); U_<FB>(フラットバンド-ポテンシャル); 光応答性 /

Effects of spray conditions and heat-treatment on the photoelectrochemical behavior of TiO_2-oxide system coatings produced by plasma spraying were investigated.It is shown that the photocurrent of air plasma-sprayed coatings is larger than one of LPC plasma-sprayed coatings, and auxiliary gas, H_2, influences greatly the photoelectrolysis of TiO_2 and TiO_2-oxide mixture coatings.The photocurrent of TiO_2 plasma-sprayed coatings increases by adding various metal-oxides, such as Al_2O_3, Y_2O_3 etc, to TiO_2 coatings.The photoelectrochemical properties of TiO_2 and TiO_2-oxide system plasma-sprayed coatings are improved greatly by heat-treatment (400ﾟC,90min.) in air.The photocurrent of TiO_2 and TiO_2-oxides coatings that plasma- sprayed with plasma gas, Ar-H_2 and then heat-treated(400ﾟC,90 min.) in air, depend on the formation free energy of the additional oxide. And, photocurrents of such TiO_2-oxide mixture plasma- sprayed coatings increase with the decrease of the ionized donor density concentration, ND of TiO_2-oxide mixture photoanodes.It is concluded that polycrystalline TiO_2 coatings produced by the plasma-spraying display similar photoelectrochemical characteristics to single-crystal TiO_2 material.

研究了喷涂条件和热处理对等离子喷涂TiO_2-氧化物体系涂层光电化学行为的影响，结果表明，空气等离子喷涂涂层的光电流大于LPC等离子喷涂涂层的光电流，辅助气体H_2、TiO_2等离子体的光电流对TiO_2和TiO_2-氧化物混合膜的光电流有很大影响。在TiO_2涂层中添加Al_2O_3、Y_2O_3等金属氧化物，可提高涂层的光电性能，并对TiO_2及TiO_2-氧化物体系等离子喷涂涂层进行热处理（400 ℃，90 min），可显著提高涂层的光电性能。用等离子体气体Ar-H_2等离子喷涂TiO_2和TiO_2氧化物涂层，然后热处理（400 ℃，90 min），研究了涂层的光电流。在空气中，取决于附加氧化物的形成自由能。随着TiO_2-氧化物混合物光阳极电离施主浓度ND的降低，多晶TiO_2涂层的光电流增大，表明多晶TiO_2涂层具有与单晶TiO_2材料相似的光电化学特性。

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