2004 Fiscal Year Final Research Report Summary
Time-resolved vibrational spectroscopic study of electrode dynamics
| Project/Area Number |
14205121
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
工業物理化学
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| Research Institution | Hokkaido University |
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Principal Investigator |
OSAWA Masatoshi Hokkaido University, Catalysis Research Center, Professor, 触媒化学研究センター, 教授 (00108466)
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| Co-Investigator(Kenkyū-buntansha) |
YE Shen Hokkaido University, Catalysis Research Center, Associated Professor, 触媒化学研究センター, 助教授 (40250419)
YAMAKATA Akira Hokkaido University, Catalysis Research Center, Research Associate, 触媒化学研究センター, 助手 (60321915)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Electrochemistry / Surface electrochemistry / Electrode dynamics / Infrared spectroscopy / Electrocatalysis / Self-assembled monolayer / Electrochemical oscillations / Reaction mechanism |
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| Research Abstract |
This project aimed at to study electrode kinetics and dynamics by using fast time-resolved infrared spectroscopy. The use of surface-enhanced infrared absorption spectroscopy (SEIRAS) enabled ultrafast time-resolved study in the picosecond range. The main achievements are as follows.
1.Ultrafast time-resolved IR spectrscopy
Double-layer charging with a 0.1-1 ms time constant has hampered the study of ultrafast electrode dynamics. This problem was circumvented for the first time by coupling the so-called temperature jump method with picosecond time-resolved SEIRAS. The rapid heating of the interface by a laser pulse results in the sudden change in potential through reorientaion of water.
2.Technical developments in SEIRAS
Simple and cost-effective techniques to prepare very stable SEIRA-active thin metal film electrodes on Si and Ge prisms have been developed. These techniques significantly contributed to the success of the picosecond time-resolved IR studies mentioned above.
3.Molecular sca
… More
le analysis of electrochemical oscillations
A variety of oscillations occur at the electrochemical interface. We investigated potential and current oscillations during formic acid oxidation on Pt by time-resolved SEIRAS and proposed a new concept that explains the oscillations without any assumptions.
4.Electrocatalysis
Hydrogen evolution, oxygen reduction, and anodic oxidation of C_1 molecules on Pt electrodes that constitute the basis of low temperature fuel cells were examined in detail at the molecular scale. We clearly showed for the first time that all C_1 molecules are oxidized CO_2 via formate, which totally revised the general consensus.
5.Structures and functions of self-assembled monolayers (SAMs)
Hydrogen bond pairing between an adenine derivative self-assembled on an Au electrode and a thimidine derivative were examined by SEIRAS as a model system of molecular recognition system. We also succeeded in fabricating new types of SAMs using triruthenium complexes. Their structures and functions were examined by SEIRAS. Less
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Research Products
(52 results)
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[Book] 界面ハンドブック2002
Author(s)
岩澤広康
Total Pages
1208(21)
Publisher
エヌ・ティー・エス(東京)
Description
「研究成果報告書概要(和文)」より
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