Synthesis of metal oxides with coordinatively-unsaturated structures: search for their redox functionalities

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02827
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Kanagawa University
• Principal Investigator: Motohashi Teruki 神奈川大学, 工学部, 教授 (00323840)
• Co-Investigator(Kenkyū-buntansha): 土井 貴弘 東邦大学, 理学部, 准教授 (20359483)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 結晶構造 / 金属酸化物 / 配位不飽和 / 結晶構造化学 / レドックス

Outline of Final Research Achievements

The present study dealt with the development of novel functional materials among complex metal oxides consisting of "coordinative unsaturation" cationic sites. The extensive research on the synthesis and characterization of various oxides led to the discovery of several redox functionalities. (1) Oxygen storage materials: a Melilite-type manganese oxide and oxygen-deficient perovskite-type iron oxides. (2) Oxygen evolution reaction electrocatalysts: Melilite-type Fe/Co and Fe/Co/Ni oxides. (3) Oxidative coupling of methane catalysts. These research achievements indicate that coordinative unsaturation sites in crystalline compounds facilitate the appearance of redox functionalities, making such compounds potential candidates as redox functional materials.

Free Research Field

固体化学、材料化学、環境エネルギー材料

Academic Significance and Societal Importance of the Research Achievements

環境・エネルギー材料開発において未踏物質群であった「配位不飽和化合物」がさまざまなレドックス機能性材料の有力候補であることを立証した。手がけた材料は、酸素ガス製造のための「酸素貯蔵材料」、水分子分解による水素製造に応用可能な「酸素発生反応電極触媒」、炭素資源の有効活用に資する「メタン酸化カップリング触媒」である。本研究では、従来材料と同等またはそれ以上の性能をもつ配位不飽和化合物の新規材料の開発に成功した。