在水中的电极的光化学发光
Yiran Zhao1, Jing Yu2, Guobao Xu3,4
1Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , F-35000 Rennes , France.
Journal of the American Chemical Society
|August 3, 2019
概括
我们报告了一种使用电极的新型光化学发光系统 (P-ECL). 这种方法在水中实现稳定,强烈的光发射,使新的检测和成像应用成为可能.
科学领域:
- 电化学
- 摄影化学
- 材料科学
背景情况:
- 传统的电化学发光 (ECL) 需要高电位 (> +1 V 与 SCE 相比).
- 半导体电极上的光生成孔 (h+) 通常会导致水性电解质中的光腐蚀.
- 在水中的半导体电极上使用光生成载体生成ECL具有挑战性.
研究的目的:
- 引入光化学发光 (P-ECL) 系统.
- 克服基于半导体的ECL中的光腐蚀和低潜力的挑战.
- 在水性介质中展示一种新的ECL生成上转换过程.
主要方法:
- 使用[Ru(bpy) ]2+和tri-n-propylamine (TPrA) 的模型ECL系统.
- 使用基于Si的道电极,用薄薄的SiO2和Ni膜保护.
- 在810nm处研究光吸收,在635nm处触发ECL发射.
主要成果:
- 使用受保护的Si电极在水中产生P-ECL.
- 在0.5V与SCE的创纪录低电位下实现ECL排放的上转换过程.
- 由于光和低电位的协同作用,观察到稳定而强烈的ECL发射.
结论:
- 开发的P-ECL策略有效地抑制光腐蚀,并使水性电解质中的ECL成为可能.
- 这种方法可以通过将光吸收和电刺激相结合,以显著降低的电化学潜力产生ECL.
- 对于超灵敏检测,光定位设备和成像应用,P-ECL系统具有前景.
相关概念视频
Standard Electrode Potentials
50.0K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
50.0K
States of Water
56.4K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
56.4K
Electrodes: Overview
2.6K
Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
2.6K
Water and Mineral Acquisition
35.4K
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.
35.4K
Quality of Water
507
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
507
The Water Cycle
28.1K
The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
28.1K


