分子レベル g-C3N4 酸素電極反応のための新種の電気触媒として調整された移行金属
Yao Zheng1, Yan Jiao1, Yihan Zhu2
1School of Chemical Engineering, University of Adelaide , Adelaide, SA 5005, Australia.
Journal of the American Chemical Society
|February 22, 2017
まとめ
移行金属を含む新しいグラフィット性炭酸化物 (g-C3N4) 触媒は,酸素還元および進化反応 (ORR/OER) の高い活性を示している. これらの金属炭素窒化物 (M-C3N4) 材料は,エネルギー装置における貴金属触媒の有望な代替品です.
科学分野:
- 材料科学
- 電気化学
- カタリシス
背景:
- 貴金属触媒は,エネルギー変換における酸素還元と進化反応 (ORRとOER) に不可欠です.
- 高価な金属の費用対効果の高い代替品の開発は,エネルギー技術の進歩に不可欠です.
- 金属-窒素/炭素 (M-N/C) 協調複合体は,有望な非貴金属触媒である.
研究 の 目的:
- 新しい分子レベルのグラフィティック・カーボン・ニトリド (g-C3N4) 調整型移行金属 (M-C3N4) 触媒の設計と開発.
- これらのM-C3N4材料のORRとOERの電気触媒活性を評価する.
- 次世代のM-N/C触媒の分子設計の指針を提供すること.
主な方法:
- 理論的評価と計算モデリング
- M-C3N4触媒の実験合成と特徴付け
- ORRとOERの性能のためのアルカリ媒体の電気化学試験.
主要な成果:
- コバルトC3N4触媒は,ORRとOERの貴金属基準に匹敵する電解活性を示した.
- g-C3N4マトリックス内の正確なM-N2調整は,高触媒活性源として特定されました.
- 様々なM-C3N4複合体の可逆性ORR/OERの傾向が確認された.
結論:
- 分子レベルのM-C3N4触媒は,酸素電極反応のための新しい世代の効率的な電気触媒を表しています.
- g-C3N4のM-N2調整モチーフは,高い可逆性ORR/OER活性を達成するための鍵です.
- この研究は,エネルギーアプリケーションのための高度なM-N/C触媒の設計のための枠組みを提供します.
関連する概念動画
Thermal and Photochemical Electrocyclic Reactions: Overview
3.1K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.1K
Heterogeneous Catalysis
41
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
41
Oxidation-Reduction Reactions
76.4K
Oxidation–Reduction Reactions
76.4K
Properties of Transition Metals
30.4K
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.
30.4K
Catalysis
31.3K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
31.3K
Oxidation and Reduction of Organic Molecules
9.8K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
9.8K


