Study on laser electrochemical detector

激光电化学探测器的研究

• 批准号: 03804043
• 负责人: WATANABE Iwao
• 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: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03804043/
• 关键词: electrochemical analysis; photo-induced electrode reaction; catalytic reaction; laser; microelectrode; マイクロ電極; レ-ザ-; 電気化学検出器; 光電気化学; 分光電気化学

In order to attain a high photon density on an electrode surface, a beam from Ar^+ laser (10 mw at 488 nm) or He-Ne laser (50 mw at 632.8 nm) was focused with an objective and was threw on the micro-electrode. The electrode reaction of [Fe(CN)_6]^<4-> to [Fe(CN)_6]^<3-> was promoted by the laser irradiation through the heating effect, while the reation of Fe^<2+> to Fe^<3+> was suppressed. The promotion and the supression were explained on a basis of change in entropy of the electrode reactions. On the other hand, catalytic current was found in a reaction system where a Fe(III) oxalate was reduced to a Fe(II) oxalate by the laser irradiation in the bulk solution and sequently the Fe(II) oxalate was oxidized at the electrode. The high photon density promoted the reaction cycle between reduction in the solution and the oxidation at the electrode. As the result, the catalytic current was observed. This reaction scheme is available for a new electrochemical analysis.

为了在电极表面上达到高光子密度，将AR^+激光器（488 nm的10 MW）或He-Ne Laser（632.8 nm的50 MW）的光束聚焦为目标，并以一个物镜为目标，并在微电极上投掷。 [Fe（Cn）] _6]^<4->与[Fe（Cn）_6]^<3->的电极反应通过激光照射通过加热效应促进，而Fe^<2+> to fe^<3+>的电辐射被抑制。在电极反应的熵变化的基础上解释了促进和屈服。另一方面，在一个反应​​系统中发现了催化电流，在该反应系统中，通过激光辐照在大量溶液中，将Fe（III）草酸盐降低为OOCALATE，然后在电极上氧化了Fe（II）草酸盐。高光子密度促进了溶液还原与电极处的氧化之间的反应周期。结果，观察到催化电流。该反应方案可用于新的电化学分析。

项目成果

N.Ogawa: "Electrochemical reduction of nitrate ion at mercury electrodes in the presence of alkaline-earth metal ions." Denki Kagaku. 60. 26-31 (1992)

N.Okawa：“在碱土金属离子存在的情况下，汞电极上硝酸根离子的电化学还原。”

T.Hinoue: "Observation of photopyroelectric signal in X-ray region." Chemistry Letters. 2127-2130 (1992)

T.Hinoue：“X射线区域光热释电信号的观察。”

S. Ikeda: "Structure of metal complexes in solution by the EXAFS and XANES methods, in Structure and Dynamics in Solution, ed. by H. Ohtaki and H. Yamatera" Elsevier Science Publishers, Amsterdam. 39-56 (1992)

S. Ikeda：“通过 EXAFS 和 XANES 方法测定溶液中金属配合物的结构，溶液中的结构和动力学，由 H. Ohtaki 和 H. Yamatera 编辑”Elsevier Science Publishers，阿姆斯特丹。

H.Monjushiro: "Ultraviolet Photoelectron Yield Spectra of Thin Gold Films Measured in Air" Anal.Sciences. 7. 543-547 (1991)

H.Monjushiro：“在空气中测量的金薄膜的紫外光电子产率光谱”Anal.Sciences。

N. Ogawa: "Electrochemical reduction of nitrate at mercury electrode in the presence of alkaline-earth metal ion" Denki Kagaku. 60. 26-31 (1992)

N. Okawa：“碱土金属离子存在下汞电极上硝酸盐的电化学还原”Denki Kagaku。