Development of new insoluble oxygen evolution ceramic electrode used for electrolysis in molten salts

• Project/Area Number: 25288111
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Inorganic industrial materials
• Research Institution: Doshisha University
• Principal Investigator: HIROTA KEN 同志社大学, 理工学部, 教授 (30238414)
• Co-Investigator(Kenkyū-buntansha): KATO Masaki 同志社大学, 理工学部, 教授 (90271006) ; GOTO Takuya 同志社大学, 理工学部, 教授 (60296754)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2015: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2013: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
• Keywords: 溶融塩電解 / 不溶性酸素発生電極 / ヘルシナイト（FeAl2O4） / 固溶体酸化物 / セラミックスプロセス / 熱間静水圧プレス / 非化学量論組成 / 溶融塩電解用電極 / スピネル型金属酸化物 / ヘルシナイト / 固相反応法 / 固溶体 / 磁気特性

Outline of Final Research Achievements

The present applicants focused attention on a metal oxide of spinel FeAl2O4 as the insoluble oxygen evolution electrodes at high temperatures. To improve both the electrical conductivity and the durability in the molten salts, the present applicants have synthesized solid solution Fe1+Al2O4 ceramics by controlling the content of Fe from the chemical stoichiometry of 1. Their electrical resistivity ρ of spinel Fe1+δAl2O4 ceramics was much reduced from 1.46 x10∧4 (δ=0) to 4.46 x10∧0 Ω・m (δ=0.45) with increasing δ value.
Some physical and chemical properties of the present spinel ceramics have been investigated from the viewpoints of the anode electrode for oxygen generating in the molten fluoride salts during electrolyzing test. The possibility of Fe1.25Al2O4 being used as non-consumable anode electrode is suggested and usability of oxide electrodes is recognized.

Research Products

• [Journal Article] スピネル型(Fe,Mn)Al2O4 系フェライトのパルス通電加圧焼結と物性評価 (2014)
  • Author(s): 植田 将弘，加藤 将樹，廣田 健
  • Journal Title: 粉体および粉末冶金 Volume: 61 Pages: 171-178
  • NAID: 130004678655
  • Peer Reviewed
• [Journal Article] スピネル型(Fe,Mn)Al2O4系フェライトのパルス通電加圧焼結と物性評価 (2014)
  • Author(s): 植田将弘，加藤将樹，廣田健
  • Journal Title: 粉体および粉末冶金 Volume: 4 Pages: 171-178
  • NAID: 130004678655
  • Peer Reviewed
• [Presentation] 溶融フッ化物中でのスピネル系酸電極陽特性 (2015)
  • Author(s): 田伏 章浩, 坂中 佳秀, 後藤 琢也, 廣田 健
  • Organizer: 第47回溶融塩化学討論会
  • Place of Presentation: 神戸大学百年記念館六甲ホール
  • Year and Date: 2015-10-28
• [Presentation] New Anode Materials in Molten Oxide Electrolytes for In-Situ Resource Utilization (2015)
  • Author(s): Akihiro TABUSHI, Shunichi KIMURA, Yoshihide SAKANAKA, Kazuki KOCHI, Takuya GOTO, Ken HIROTA
  • Organizer: ISPS 2015
  • Place of Presentation: Ryukoku University, Japan
  • Year and Date: 2015-09-02
  • Int'l Joint Research
• [Presentation] クエン酸ゲル法によるB-サイト置換スピネル型ヘルシナイトFe(Al1-xMnx)2O4粉体の合成と磁気特性 (2015)
  • Author(s): 廣田健
  • Organizer: 粉体粉末冶金協会 平成27年度春季大会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-05-27
• [Presentation] 溶融フッ化物中におけるFe1+δAl2O4電極の陽極特性 (2015)
  • Author(s): 田伏 章浩，坂中 佳秀，後藤 琢也, 廣田 健, 加藤 将樹
  • Organizer: 電気化学会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2015-03-15 – 2015-03-17
• [Presentation] 磁性ナノコンポジット用(Fe,Mn)Al2O4系フェライトのパルス通電加圧焼結と物性評価 (2013)
  • Author(s): 植田将弘，加藤将樹，廣田健
  • Organizer: 粉体粉末冶金協会
  • Place of Presentation: 愛知•名古屋国際会議場
• [Book] Processing and Properties of Advanced Ceramics and Composites VI (2014)
  • Author(s): Ken Hirota, Kengo Shibaya, Masaki Kato, and Hideki Taguchi
  • Total Pages: 375
  • Publisher: The American Ceramic Society's：Wiley
• [Patent(Industrial Property Rights)] 磁性材料およびその製造方法 (2016)
  • Inventor(s): 廣田健,加藤将樹,松谷伸哉,小谷淳一
  • Industrial Property Rights Holder: 廣田健,加藤将樹,松谷伸哉,小谷淳一
  • Industrial Property Rights Type: 特許
  • Filing Date: 2016-01-28
  • Overseas
• [Patent(Industrial Property Rights)] 磁性材料およびその製造方法 (2015)
  • Inventor(s): 廣田健、加藤将樹
  • Industrial Property Rights Holder: 廣田健、加藤将樹
  • Industrial Property Rights Type: 特許
  • Filing Date: 2015-02-12