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Spectroelectrochemical evidence of the role of viologen moiety as an electron transfer mediator from ITO substrate to a Pt complex acting as a confined molecular catalyst for hydrogen evolution reaction

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Title: Spectroelectrochemical evidence of the role of viologen moiety as an electron transfer mediator from ITO substrate to a Pt complex acting as a confined molecular catalyst for hydrogen evolution reaction
Authors: Kurniawan, Cepi Browse this author
Noguchi, Hidenori Browse this author →KAKEN DB
Masuda, Takuya Browse this author
Uosaki, Kohei Browse this author →KAKEN DB
Keywords: Spectroelectrochemistry
Viologen monolayer
Confined molecular catalyst
Hydrogen evolution reaction
Issue Date: Jan-2016
Publisher: Elsevier
Journal Title: Electrochemistry Communications
Volume: 62
Start Page: 56
End Page: 59
Publisher DOI: 10.1016/j.elecom.2015.11.008
Abstract: Spectroelectrochemical measurements at indium tin oxide (ITO) electrode modified with viologen monolayer showed two redox peaks corresponding to viologen dication/radical cation (V2 +/V+radical dot) and viologen radical cation/neutral form (V+radical dot/V0) in cyclic voltammogram (CV), and stable spectra corresponding to radical cation (V+radical dot) and neutral form (V0) of viologen at potentials between V2 +/V+radical dot and V+radical dot/V0 redox peaks and those more negative than V+radical dot/V0 redox peak, respectively. On the other hand, at viologen monolayer modified ITO electrode with Pt complex confined within the monolayer by ion exchange reaction, no redox peaks but large current due to hydrogen evolution reaction (HER) were observed in CV and no absorption peaks corresponding to V+radical dot or V0 were observed in the UV/visible spectra obtained during the potential scan. Time-resolved spectroelectrochemical measurements, however, showed that V+radical dot is formed upon the potential step to the potentials more negative than V2 +/V+radical dot redox potential and disappeared within ca. 1 ms, showing that electron is transferred from ITO electrode to proton to form hydrogen via viologen moiety and Pt complex.
Rights: © 2016, Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/68046
Appears in Collections:総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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