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関連する概念動画

Oxidation Numbers03:14

Oxidation Numbers

42.9K
In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
42.9K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.4K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
24.4K
Alkali Metals03:06

Alkali Metals

24.9K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.9K
Metallic Solids02:37

Metallic Solids

20.8K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.8K
Properties of Transition Metals02:58

Properties of Transition Metals

30.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
30.0K
Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

75.8K
Oxidation–Reduction Reactions
75.8K

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関連する実験動画

Updated: Feb 9, 2026

Writing and Low-Temperature Characterization of Oxide Nanostructures
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Writing and Low-Temperature Characterization of Oxide Nanostructures

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ナノ構造の混合金属酸化物による効率的な酸素電解

Xiang-Kui Gu1, Juliana S A Carneiro1, Samji Samira1

  • 1Department of Chemical Engineering and Materials Science , Wayne State University , Detroit , Michigan 48202 , United States.

Journal of the American Chemical Society
|May 31, 2018
PubMed
まとめ

研究者は,混合金属酸化物を用いて効率的な酸素電気触媒の設計原理を開発しました. ナノ構造のコバルトドーピングされたランタンニクレート酸化物は,燃料電池における酸素還元反応に高い活性と安定性を示しています.

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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles

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関連する実験動画

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科学分野:

  • 材料科学
  • 電気化学
  • エネルギー変換と貯蔵

背景:

  • 酸素の電気触媒は エネルギーシステムにとって不可欠ですが 最適な触媒は依然として難解です
  • 非ステイキオメトリックの混合金属酸化物は,調節可能な表面と高速な酸素伝導性を提供します.
  • 層状のRuddlesden-Popper (R-P) オキシドは酸素電解に有望である.

研究 の 目的:

  • R-P酸化物における酸素電解工学の設計原理を開発する.
  • 酸素還元反応 (ORR) の効率的な電気触媒を特定する.
  • 新しい触媒を用いた固体酸化燃料電池 (SOFC) の性能を向上させる.

主な方法:

  • 理論的 (密度関数理論 - DFT) と実験的研究を組み合わせた.
  • 利用されたDFT派生記述子:表面の酸素空位に対するO2結合エネルギー.
  • ナノ構造のR-P酸化物を制御した合成を用いて,熱化学/電気化学の研究で検証した.

主要な成果:

  • DFTディスクリプターはORRの効率的なR-P酸化物構造を効果的に特定しました.
  • ナノ構造のコドーピングされたランタンニクレート酸化物は高いORR活性を示した.
  • SOFCをカトドに組み込むことで,中間の温度 (550 °C) で性能が著しく向上し,長期的な安定性があります.

結論:

  • 開発された設計原理は,酸素電解のための混合イオン電子導体酸化物を効果的に設計します.
  • ナノ構造のコドーピングされたランタンニクレート酸化物は,酸素電解の非常に有望な触媒である.
  • 発見はエネルギー用途の効率的な電気触媒の設計を進める.