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1995 Fiscal Year Final Research Report Summary

Photoelectrochemical reduction of Carbon dioxide by metal-complexes-membrane electrodes

Research Project

Project/Area Number 06453114
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 工業物理化学
Research InstitutionMIE UNIVERSITY

Principal Investigator

MIZUNO Takayuki  Mie-Univ, Faculty of Engineering, Professor, 医学部, 教授 (80200012)

Co-Investigator(Kenkyū-buntansha) OHTA Kiyohisa  Mie-Univ, Faculty of Engineering, Associate Professor, 医学部, 助教授 (50024609)
Project Period (FY) 1994 – 1995
KeywordsCarbon dioxide / Photocatalytic reduction / Modified membrane electrode
Research Abstract

Object : Phtochemical reduction of CO_2 is considered to be one of the most pro-mising approaches to photochemical conversion and storage of solar energy. An aqucous system of Ruthenium (II) -bipyridine complexes-methylviologen (MV^<2+>) -triethanolamine is one of homogeneous photosinsitized reductions of CO_2. In thissystem tricthanolamine is exhausted as sacrificial electron donor. With a view to search a cyclic system, we study on photoelectrochemical CO_2 reduction using coated membrane electrodes containing complexes and MV^<2+> without sacrificial clectron donor. Additionally photocatalytic reduction of CO_2 was studied using TiO_2 in suspension in liquid CO_2 and supercritical CO_2.
Results :
1.The electrode covered by the membranes containing Ru (bpy)_3^<2+> and MV^<2+> formed the largest photocurrent in the potential below -0.2 V.This indicates that Ru (bpy)_3^<2+> and MV^<2+> system in the membrane was most effective in generating photoc-urrent.
2.In the Ru (bpy)_3^<2+> and MV^<2+> membrane system, exclusively II_2 was found as the reduction product. The electrode electrodeposited Pt or Ru reduced photoelectro-chemically CO_2 to produce malonic acid, acetic acid and formic acid as reduction products.
3.We found that CO_2 was reduced by two stage reactions, that is, CO_2 fluid was photoc-atalytically reduced with TiO_2 in suspension and then protonated to formic acid by water addition.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] M.Tanahashi,T.Mizuno K.Ohta,A.Saji: "Photoelectrochemical reduction of CO_2 in water by tris (2,2′bipyridine) Ruthenium (II) and methyl viologen incorporated into coated Nafion membranes" Proc.'95 Asian Conf. on Electrochemistry. May 28-31,1995,Osaka. 174-175 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mizuno,K.Adachi,K.Ohta,: "Effect of CO_2 pressure on photocatalytic reduction of CO_2 using TiO_2 in aqueous solutions" J.Photochem.Photobio.A Chem.(in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mizuno,A.Naito,K.Ohta: "Electrochemical reduction of CO_2 in metanol at -30℃" J.Electroanal.Chem.391. 199-201 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mizuno,K.Ohta,A.Sasaki,A.Kawabe: "Effect of temperature on electrochemical reduction of high-pressure CO_2 with In,Sn,and Pb electrodes" Energy Sources. 17. 503-508 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Mizuno,K.Ohta,H.Tsutsumi,A.Saji: "Photocatalytic reduction of CO_2 with dispersed TiO2/Cu powder mixtures in supercritical CO_2" Chem.Lett.1994. 1533-1536 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tanahashi, T.Mizuno, K.Ohta, A.Saji: "Photoelectrochemical reduction of CO_2 in water by tris (2,2' bipyridine) Ruthenium (II) and methyl viologen incorporated into coated Nafion membranes" Proc.'95 Asian Conf.on Electrochemistry, May 28-31,1995, Osaka. 174-175 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mizuno, K.Adachi, K.Ohta: "Effect of CO_2 pressure on photocatalytic reduction of CO_2 using TiO_2 in aqueous solutions" J.Photochem.Photobio.A Chem.(in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mizuno, A.Naito, K.Ohta: "Electrochemical reduction of CO_2 in metanol at -30゚C" J.Electroanal.Chem.391. 199-201 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mizuno, K.Ohta, A.Sasaki, A.Kawabe: "Effect of temperature on electrochemical reduction of high-pressure CO_2 with In, Sn, and Pb electrodes" Energy Sources. 17. 503-508 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mizuno, K.Ohta, H.Tsutsumi, A.Saji: "Photocatalytic reduction of CO_2 with dispersed TiO2/Cu powder mixtures in _2 pressure on photocatalytic reduction of supercritical CO_2" Chem.Lett.1994. 1533-1536 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1997-03-04  

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