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2016 年度 実施状況報告書

Photo-electrochemical water-splitting on conducting polymer composite materials

研究課題

研究課題/領域番号 16K05922
研究機関早稲田大学

研究代表者

ウィンザージェンセン B  早稲田大学, 理工学術院, 教授(任期付) (70770410)

研究期間 (年度) 2016-04-01 – 2019-03-31
キーワードWater splitting / Conducting polymers / Hydrogen / Electrochemistry
研究実績の概要

At the initiation of the project it was found that the use of iron(III) as oxidants for the polymerization of polythiophenes produced unwanted iron-oxide residuals and that these species work as electron traps during the light enhanced water-splitting, thereby limiting the H2 production. I2 was identified as ideal replacement oxidant for polyterthiophene (I2-PTTh) with H2 evolution of 330 mmol h-1 g-1.Surprisingly it was found that the catalytic activity for the I2-PTTh did not follow the expected Nernstian dependency of pH as previous seen for materials polymerized with iron(III). Instead an increase in onset potential was observed when moving to higher pH, which make I2-PTTh an ideal match for oxygen evolution electrodes like MnOx. Derivatives of terthiophene with phenyl or phenoxy groups has been successfully synthesized and the polymerization optimization and testing of these are ongoing.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

The work related to the adoption of I2 as oxidant for the polymerization of ter-thiophene and derivatives thereof was not foreseen in the original plan. However, this shift has focused the synthesis activities to a much narrower range of possible thiophene-derivatives by providing an “universal” metal-free polymerization platform for the ter-thiophene motive. It is expected that this new knowledge and approach will accelerate the selection and testing of thiophene derivatives and thus make up for the delay in the synthesis of precursors.

今後の研究の推進方策

The 2nd year will mainly concern the performance of PTTh derivatives with tuned HOMO levels to increase the reduction potential and thus achieve water-reduction at higher potentials. The focus will be on synthesizing and testing TTh derivatives where increasing the oxidation potential is combined with incorporation of hydrophilic entities such as -O-R or extended glycolic structures -O-(C2H4O)x-R and thereby obtain materials that fulfill both the requirements described in the research proposal. Incorporation of redox polymers. Selecting and testing redox polymers for the water-oxidation reaction. First choice will be from the group of materials with phenol/quinone functionality, where the redox potential fits the oxidation potential of water in similar fashion to how tyrosine is employed in biological systems.There are not intended any strategical changes of the research plans for the and 3rd year of the project.

次年度使用額が生じた理由

For use as a reagent next year.

次年度使用額の使用計画

We will devote it to reagents next year.

  • 研究成果

    (1件)

すべて 2017

すべて 雑誌論文 (1件) (うち国際共著 1件、 オープンアクセス 1件)

  • [雑誌論文] Enhanced catalytic activity towards hydrogen evolution on polythiophene via microstructural changes, International Journal of Hydrogen Energy2017

    • 著者名/発表者名
      Chun Hin Ng, Orawan Winther-Jensen, C. Andre Ohlin, Bjorn Winther-Jensen
    • 雑誌名

      International Journal of Hydrogen Energy

      巻: 42 ページ: 886-894

    • DOI

      10.1016

    • オープンアクセス / 国際共著

URL: 

公開日: 2018-01-16  

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