成果報告書詳細
管理番号20160000000332
タイトル*平成27年度中間年報 エネルギー・環境新技術先導プログラム 電解還元によるCO2の革新的固定化研究開発
公開日2016/5/17
報告書年度2015 - 2015
委託先名国立大学法人長岡技術科学大学 国立大学法人北海道大学触媒科学研究所 国立研究開発法人宇宙航空研究開発機構 堺化学工業株式会社 日揮触媒化成株式会社
プロジェクト番号P14004
部署名イノベーション推進部
和文要約
英文要約Title: Advanced Research Program for Energy and Environmental Technologies / Investigation of CO2 fixation by electroreduction (FY2015-FY2016) FY2015 Annual Report

Our purpose is to reduce CO2 by electrochemical method at low overpotential. To achieve this purpose, the investigation is progressed by following five themes:
1) Sputtered alloy electrocatalyst for CO2 electrolysis
We found that Pt/C and Pt-Ru/C electrocatalysts reduce CO2 at the electrode potential of 0-0.3 V vs. DHE. We prepared a Pt-Ru electrode by a sputtering method and evaluated CO2 electroreduction property using a cyclic voltammetry in CO2-saturated H2SO4. It is found that CO2 is reduced at the Pt-Ru sputtered electrode as well as Pt/C and Pt-Ru/C catalysts.
2) Non-noble metal powder catalyst
To estimate catalytic activity of the CO2 electrolytic reduction, we prepared some catalysts of transition metal species (Fe, Co, Ni, Cu and Zn) supported on carbon. CO2 reduction activity of each catalysts were evaluated with cyclic voltammetry. We found that the charge variation caused by re-oxidation of reduced CO2 species was observed only in Ni supported on carbon (Ni/C) catalyst, in the atmosphere of CO2. Thus it suggested that Ni/C catalyst was possible to be activate the CO2 electrolytic reduction.
3) Noble metal alloy powder catalyst
We are investigating a CO2 electrode reaction using a polymer electrolyte fuel cell having Pt-M/C-based anode and cathode. Carbon supported platinum metal alloy (Pt-M/C) are widely used in low temperature fuel cells. Platinum alloy nanoparticles show great promise as electrocatalysts for the oxygen reduction in fuel cells cathodes. The purpose of this research is to provide a better insight into the preparation factors making for Pt-M bimetallic alloy nanoparticles.
4) Mechanistic study of electro-catalytic CO2 reduction
For developing active electrocatalysts, deep insights into the reaction mechanism will be helpful and indispensable. To clarify the reaction mechanism, we employed surface-enhanced infrared absorption spectroscopy in an ATR configuration (ATR-SEIRAS), which facilitates in situ, real-time monitoring of reaction processes occurring on electrocatalysts under potentiodynamic conditions. ATR-SEIRAS was applied first to CO2 reduction on Au electrodes and revealed that CO2 is reduced to CO at atop sites of the Au surface. The approach established here will be applied to other electrocatalysts.
5) System design for the low cost CO2 reduction reactor
Collaborating with Nagaoka Univ. of Technology, JAXA promote the system design of the reactor. The important point for the design is the water balance and the temperature control of the system. We are going to apply the fuel cell technology to satisfy the requirement, where the relationship between the potential and the current density is very important. We shall also apply the solvers like COMSOL and ASPEN PLUS to obtain the best balance for the operational conditions using carbon dioxide, hydrogen and water.
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