Function of Nano/amorphous Hybrid Catalyst with Low Oxygen Overpotential

• Project/Area Number: 17K06869
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Doshisha University
• Principal Investigator: Kawaguchi Kenji 同志社大学, 研究開発推進機構, 准教授 (40744769)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: ナノ／アモルファスハイブリッド酸化物 / 電気化学触媒 / 酸素発生反応 / 電解プロセス / 省エネルギー / ナノ／アモルファスハイブリッド触媒 / 電極触媒

Outline of Final Research Achievements

The effects of the nanoscale particle size of RuO2 in thermally prepared RuO2-coated Ti anodes on electrochemical kinetic parameters such as the active surface area and Tafel slope for oxygen evolution in sulfuric acid solutions were investigated. RuO2/Ti anodes with four different average sizes of RuO2 particles, 5.6 nm, 6.8 nm, 14.6 nm, and 21.2 nm were prepared.
The present study reveals that changes in the nanoscale size of RuO2 affect not only the mass transfer process but also the electron transfer process for oxygen evolution in sulfuric acid solutions.

Academic Significance and Societal Importance of the Research Achievements

本研究では，ナノ／アモルファスハイブリッド酸化物触媒を取り上げ，学術的な観点から触媒発現機構に関して研究を行い，RuO2のナノ粒子化が酸素発生反応の物質移動速度および電荷移動速度の両方に影響し，酸素過電圧の低減に寄与することを明らかにした。
本研究成果をもとに継続するナノ／アモルファスハイブリッド酸化物触媒の開発は，消費電力の削減が課題である既存の電解プロセスにおいて「省エネルギー化と環境負荷低減」に寄与する。さらには，ナノ／アモルファスハイブリッド酸化物触媒を用いた「省エネルギー型の新規電解プロセスの開発」への応用も期待される。

Research Products

• [Journal Article] Catalytic Activity of Nanosized Ruthenium Oxide-Coated Titanium Anodes Prepared by Thermal Decomposition for Oxygen Evolution in Sulfuric Acid Solutions (2020)
  • Author(s): Kenji Kawaguchi, Shuhei Kimura, Masatsugu Morimitsu
  • Journal Title: Electrocatalysis Volume: － Issue: 5 Pages: 505-512
  • DOI: 10.1007/s12678-020-00610-1
  • Peer Reviewed
• [Presentation] ナノ／アモルファスハイブリッド酸化物を用いた亜鉛電解採取におけるアノード電着及びカソード溶解の抑制 (2019)
  • Author(s): 川口健次，古島広夢，盛満正嗣
  • Organizer: 表面技術協会第140回講演大会
• [Presentation] 硫酸溶液中でのRuO2ナノ粒子層における酸素発生反応の速度論解析 (2018)
  • Author(s): 川口健次，木村秀平，盛満正嗣
  • Organizer: 資源・素材2018（福岡）
• [Presentation] A Novel Method to Suppress Unwanted Anodic Deposition of Manganese Oxide in Zinc Electrowinning (2018)
  • Author(s): Hiromu Furushima, Kenji Kawaguchi, Masatsugu Morimitsu
  • Organizer: AiMES 2018
  • Int'l Joint Research
• [Presentation] Development of Nano/amorphous Hybrid Oxide Catalyst for Anodic Reactions in Acidic Aqueous Solution (2018)
  • Author(s): Kenji Kawaguchi, Masatsugu Morimitsu
  • Organizer: ANEM 2018
  • Int'l Joint Research
• [Presentation] Kinetics of Nano RuO2 Prepared by Thermal Decomposition for Oxygen Evolution in Acidic Aqueous Solution (2018)
  • Author(s): Kenji Kawaguchi, Shuhei Kimura, Masatsugu Morimitsu
  • Organizer: The 69th Annual Meeting of the International Society of Electrochemistry
  • Int'l Joint Research