原子精度Au24Pt(チオラート) 12(ディチオラート) 3 優れた電気触媒的水素進化反応性を持つナノクラスター
Miyu Sera1, Sakiat Hossain2, Sara Yoshikawa1
1Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
Journal of the American Chemical Society
|October 15, 2024
まとめ
新しい金・プラチナ (Au-Pt) 合金ナノクラスターは,水素進化反応 (HER) の活性が著しく向上しています. これらの精密構造の触媒は 既存のプラチナナノ粒子触媒に比べて 優れた性能を提供します
科学分野:
- ナノ材料科学
- カタリシス
- 電気化学
背景:
- 金・プラチナ (Au-Pt) 合金ナノクラスターは,水素進化反応 (HER) の有望な触媒として浮上しています.
- 以前の研究では,HERに対する[Au24Pt ((C6) 18) 0の高い活性を示し,明確に定義されたナノ構造の可能性を強調した.
研究 の 目的:
- 合わせたリガンドシェルを持つ新しいAu-Pt合金ナノクラスタを合成し,特徴づけること.
- これらの新しいナノクラスターの構造-活性関係を電気触媒 HERで調査する.
主な方法:
- 前駆体Au-Ptナノクラスター ([Au24Pt(PET) 180) のリガンド交換反応.
- 4-テルトブチルベンゼネチオラート (TBBT),チオディチオラート (TDT),および1,3-プロパンデチオラート (PDT) を含むモノおよびディチオラートリガンドを用いた新しいクラスターの合成.
- 単一結晶のX線微分分析により,精密な原子構造を決定する.
主要な成果:
- 2つの新しいAu-Pt合金ナノクラスタの成功合成: [Au24Pt (TBBT) 12 (TDT) ]0と [Au24Pt (TBBT) 12 (PDT) ]0
- 構造分析は,以前の類似品と比較して,異なる -Au ((I)) -SR-Au ((I)) -ステープル長さと方向性を明らかにした.
- 新しいナノクラスターはHER活性が著しく増加し, [Au24Pt (TBBT) 12 (TDT) 3 ]0は基準触媒の3.5倍, [Au24Pt (TBBT) 12 (PDT) 3 ]0は基準触媒の4.9倍の活性を示した.
結論:
- リガンド構造と金属-リガンドステープル幾何学における微妙な変動は,Au-Ptナノクラスターの電気触媒性能に大きな影響を与えます.
- 合成された[Au24Pt (TBBT) 12 (TDT) ]0と[Au24Pt (TBBT) 12 (PDT) ]0は,HERにとって非常に効率的な電気触媒である.
- この研究は,エネルギー変換アプリケーションのための調整可能な性質を持つ先端のAu-Ptナノクラスター触媒の設計に関する洞察を提供します.
さらに関連する動画
09:02Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
7.8K
12:08Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
Published on: June 24, 2022
3.5K
関連する概念動画
Nuclear Stability
20.5K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively...
To hold positively...
20.5K
Nuclear Transmutation
12.9K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
12.9K
Metal-Ligand Bonds
19.3K
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...
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...
19.3K
EDTA: Chemistry and Properties
4.1K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
4.1K
Complexometric Titration: Ligands
2.5K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.5K
