関連する実験動画
Updated: Feb 5, 2026

06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
3.8K
水を効率的に電解するための酸素の空隙を持つ,ネックレスのような多層の空洞のスピネル酸化物
Shengjie Peng1,2, Feng Gong3, Linlin Li2
1Department of Mechanical Engineering , National University of Singapore , 117574 , Singapore.
Journal of the American Chemical Society
|September 15, 2018
まとめ
新しい合成戦略により 独特の空洞のニッケル・コバルト酸化物触媒が作られました これらの触媒は,水素と酸素の進化反応のための優れた二機能活性を示し,効率的な水分裂に不可欠です.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- 触媒の性能は表面構造と形態によって決定される.
- 効率的な電気触媒の開発はエネルギー変換技術の鍵です.
研究 の 目的:
- 多層の空洞のスピネル移行金属酸化物の新合成方法を開発する.
- 水素進化反応 (HER) と酸素進化反応 (OER) のための還元されたNiCo2O4 (R-NCO) の電気触媒特性を調査する.
主な方法:
- 炭酸微小球を犠牲のテンプレートとして利用した.
- 合成されたNiCo2O4 (NCO),CoMn2O4およびNiMn2O4は,ネックレスのような多層の空洞構造を持つ.
- 反応メカニズムを解明するために,密度関数理論 (DFT) の計算を使用した.
主要な成果:
- 独特のネックレスのような多層の空洞構造をスピネル酸化物で達成した.
- 減少したNCO (R-NCO) は,HERとOERの高い二機能電気触媒活性と安定性を示しています.
- アルカリ式電解機で1.61Vで10mAcm-2の水分裂電流密度を得ました.
結論:
- "吸附-カルシネーション-減少"戦略は,複雑な空洞構造を作るのに有効です.
- 減少によってもたらされる酸素の空白は,エネルギーバリアを下げることで触媒活動を大幅に高めます.
- このアプローチは,触媒のための高度な機能的材料を合成するための一般的な戦略を提供します.
関連する概念動画
Electrolysis
30.5K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
30.5K
Oxidation Numbers
42.8K
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.
42.8K
Thin-Walled Hollow Shafts
580
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
580
Pyruvate Oxidation
169.0K
After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
169.0K
Water and Mineral Acquisition
35.8K
Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
35.8K
Oxidation-Reduction Reactions
75.7K
Oxidation–Reduction Reactions
75.7K

