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Electrochemical synthesis of ammonia on room temperature allow for use of natual energy

Research Project

Project/Area Number 17K07029
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Energy engineering
Research InstitutionYamaguchi University

Principal Investigator

Endo Nobutaka  山口大学, 大学院創成科学研究科, 講師 (40314819)

Co-Investigator(Kenkyū-buntansha) 比嘉 充  山口大学, 大学院創成科学研究科, 教授 (30241251)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords電解還元 / アンモニア合成 / ガス拡散電極 / 窒素還元 / 硝酸処理 / 電解合成 / アンモニア / 常温電解 / 電気化学合成 / 常温電解合成 / 再生可能エネルギー
Outline of Final Research Achievements

Electrochemical synthesis of ammonia was carried out using gas diffusion electrodes(GDE). GDE was used commercially available one and prepared from Pt,Ru/C catalyst powder as the cathode. The nitrate ions in the aqueous solution and nitrogen gas were used as nitrogen sources. On the electrolysis experiment of nitrate ions, the reaction rate of nitrate ions reached at 57% at 0.6V. But the current efficiency of NH3 synthesis is about 3-5%. In this case, the NH3 amount is increasing with increasing pH value. It is considered that NH3 synthesis is inhibited by the too much hydrogen generation due to the excess H+ supply from anode side. On the electrolysis experiment of nitrogen gas, NH3 yield is low due to the excess H+ supply causes too much hydrogen generation and low potential electrode of cathode.

Academic Significance and Societal Importance of the Research Achievements

活性の高い吸着水素による小分子の電解還元は、環境を汚染する硝酸性窒素の処理法だけでなく、温室効果を引き起こすCO2の資源化にも応用でき、環境問題を解決できる技術だが、その効率は未だ低い。ガス拡散電極は高価な触媒の使用量を低減し、高効率で反応させる方法で、本研究成果は硝酸処理および窒素からのアンモニア合成に適用できることを示した。しかし本実験で用いた系は、反応場における水素イオンが過大となりやすく、反応場において活性化した窒素と吸着水素が適切な比率で存在・反応させることが難しく、十分な効率は得られなかった。より窒素ガスを高密度に活性化させ、活性水素を適切に供給する系を目指す必要がある。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (8 results)

All 2020 2019 2018 2017

All Presentation (8 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Presentation] 薄板状の流路における低流量時の圧力損失の検討2020

    • Author(s)
      遠藤宣隆, 仙波和也,伊達友宣,石川新茄
    • Organizer
      日本海水学会第71年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 海水電解における電解セルの構造および運転条件による影響2020

    • Author(s)
      遠藤宣隆,板谷尚樹,岡本雄大,田中翔吾,国居明生
    • Organizer
      日本海水学会第71年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Effect of electrolysis cell structure and flow conditions on the seawater electrolysis2019

    • Author(s)
      Nobutaka ENdo
    • Organizer
      第18回アジア太平洋化学工学連合会議 (APCChE2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 海水と淡水から電力をつくる逆電気透析発電技術2019

    • Author(s)
      遠藤 宣隆
    • Organizer
      第637回高崎研オープンセミナー(リサーチ)
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Electrochemical analysis of hydrogen and oxygen production cell for direct seawater electrolysis.2018

    • Author(s)
      N. Endo, N. Itaya, Y. Okamoto and S. Tanaka
    • Organizer
      第28回日本MRS年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Experimental study of pressure loss in the thin platy flow channel for electrodialysis2018

    • Author(s)
      N. Endo, K. Senba, T. Date and K. Tatsumi
    • Organizer
      第28回日本MRS年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 電気透析セルの構造および供給する溶液の水質による送液条件への影響2017

    • Author(s)
      仙波和也、遠藤宣隆
    • Organizer
      第32回中国四国地区高分子若手研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] ポリビニルアルコール系イオン交換樹脂を用いたDMFC用セルの作製と性能評価2017

    • Author(s)
      佐伯宜胤、遠藤宣隆
    • Organizer
      第32回中国四国地区高分子若手研究会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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