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Metal-Ligand Bonds

Metal-Ligand Bonds

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...

Properties of Transition Metals

Properties of Transition Metals

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.

Molecular Orbital Theory II

Molecular Orbital Theory II

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Updated: Jun 28, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

二次シェルのNドパントは,孤立したPtサイトでの酸性O2還元経路を調節する

Baoxin Ni^1,2, Peng Shen², Guiru Zhang²

¹National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of the American Chemical Society

|April 12, 2024

まとめ

プラチナ-窒素-炭素単原子触媒の窒素ドーパントは,酸素還元反応 (ORR) 経路を正確に制御する. この研究は燃料電池の効率的なエネルギー変換に適した選択性を求めています

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A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

Published on: April 10, 2019

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Published on: July 28, 2020

関連する実験動画

Last Updated: Jun 28, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

Published on: April 10, 2019

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Published on: July 28, 2020

科学分野:

電気化学
材料科学
カタリシス

背景:

プラチナ (Pt) は,エネルギー変換に不可欠な酸性酸素還元反応 (ORR) の基準触媒である.
単原子触媒 (SAC) のORR経路の制御は,複雑な調整環境のために困難です.

研究の目的:

隣接する窒素 (N) ドーパントがPt単一の原子の電子構造にどのように影響するか調査する.
Pt-N-C SACにおけるORR選択性の調整 (O2からH2OとO2からH2O2) を実証する.

主な方法:

炭素ナノチューブの合成はPt-N-C単原子触媒をサポートした.
X線放射光学とシェル分離ナノ粒子強化ラーマン光学を用いた.
総合的な分析のために理論的モデリングを使用した.

主要な成果:

0.3Vで調節可能なO2からH2O2の選択性を,Nドーパントの調整を変化させることで達成した.
ピリジニックとピロリック-Nの協調は,4電子のORR経路を好む.
二次殻のグラフィティック-N導入は,OOH結合を弱め,2電子ORR経路を促進した.

結論:

地元の化学環境,特にNドパントの調整は,Pt SACのORR選択性を制御するために重要である.
単原子触媒の調整球を操作することによって電気化学的性能を正確に制御する戦略を示した.