通过等离子诱导的热电子激发促进有效的电催化氧的产生
Guigao Liu1,2, Peng Li2, Guixia Zhao2
1Graduate School of Chemical Science and Engineering, Hokkaido University , Sapporo 060-8628, Japan.
Journal of the American Chemical Society
|July 6, 2016
概括
氧化物纳米板上的金纳米颗粒将水分裂的氧化演化反应 (OER) 提高了4倍以上. 这种等离子增强提供了一种更有效的方式来利用光产生可再生能源.
科学领域:
- 材料科学
- 电化学
- 可再生能源
背景情况:
- 水分是可再生能源的关键,但受到缓慢的氧化反应 (OER) 的限制.
- 开发高效的开放能源催化剂对于能源转换和储存技术至关重要.
研究的目的:
- 研究用金纳米颗粒装饰的氧化物纳米片 (Ni ((OH) 2-Au) 作为增强OER的催化剂.
- 探索表面等离子体共振 (SPR) 在激活OER催化中的作用.
主要方法:
- 制造Ni ((OH) 2-Au混合纳米板.
- 对OER活动和过量的电催化试验.
- 在光照射下分析催化剂性能,以观察SPR效应.
主要成果:
- 与裸体Ni ((OH) 2) 相比,Ni ((OH) 2) 催化剂的OER活性增加了4倍以上.
- 在10 mA cm−2下显著降低了270 mV的超电位,并实现了35 mV dec−1的Tafel斜率.
- 黄金纳米粒子上的SPR激发被证明可以增强OER活性,这归因于热电子诱导的Ni (III/IV) 物种生成和电荷转移的改善.
结论:
- 黄金纳米颗粒上的光子诱导SPR有效地激活基于Ni (OH) 2的系统中的OER催化.
- 这一策略显示了通用性,显示了氧化和铁氧化催化剂的类似增强.
- 这些发现为设计光辅助,节能的催化水氧化系统提供了一种新方法.
更多相关视频
11:16Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
Published on: August 18, 2020
6.1K
10:59Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
Published on: May 12, 2023
3.7K
相关概念视频
Thermal and Photochemical Electrocyclic Reactions: Overview
3.2K
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.
3.2K
Oxygenic Photosynthesis
939
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
939
Electrochemical Cells
82
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
82
Electron Transport Chains
115.3K
The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
The ETC is comprised of...
115.3K
The Z-Scheme of Electron Transport in Photosynthesis
14.9K
The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
14.9K
Processes at Electrodes
44
The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
44
