Video Experimental Relacionado
Updated: Nov 25, 2025
10:27
Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
Published on: October 5, 2017
7.6K
Desentrañar dos vías para la oxidación electroquímica de alcohol y aldehído en NiOOH
Michael T Bender1, Yan Choi Lam2, Sharon Hammes-Schiffer2
1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
Journal of the American Chemical Society
|December 15, 2020
Resumen
Los investigadores descubrieron una nueva vía dominante para la oxidación electroquímica del alcohol utilizando catalizadores de oxihidróxido de níquel (NiOOH). Esta vía implica la transferencia de hidrógeno a los sitios de Ni4+, ofreciendo nuevos conocimientos sobre las reacciones de deshidrogenación catalítica.
Área de la Ciencia:
- La electroquímica
- Catálisis
- Síntesis orgánica
Sus antecedentes:
- La oxidación selectiva de los alcoholes es crucial en la síntesis orgánica.
- La oxidación electroquímica del alcohol es una reacción clave del ánodo para la conversión de energía.
- El oxihidróxido de níquel (NiOOH) es un electrocatalizador prometedor para la oxidación del alcohol.
Objetivo del estudio:
- Identificar y caracterizar una vía dominante recién descubierta para la oxidación del alcohol en NiOOH.
- Aclarar las diferencias mecánicas entre las vías de oxidación conocidas y las nuevas.
- Investigar el papel de los estados de Ni en estos procesos catalíticos.
Principales métodos:
- Desarrollo de un nuevo procedimiento electroquímico en tres pasos para separar las corrientes de reacción.
- Análisis de varios alcoholes y aldehídos para determinar las preferencias de la vía.
- Integración de resultados electroquímicos experimentales con investigaciones computacionales.
Principales resultados:
- Identificación de una segunda vía de oxidación del alcohol más dominante en NiOOH a potenciales más altos.
- Demostración de preferencias de vías distintas para los alcoholes frente a los aldehídos.
- Pruebas de transferencia de hidruro a sitios de Ni4+ como mecanismo para la nueva vía.
Conclusiones:
- El estudio revela una vía de transferencia de hidruro no reconocida previamente para la oxidación del alcohol en NiOOH.
- Comprender estas distintas vías es esencial para optimizar la deshidrogenación electrocatalítica.
- Este trabajo proporciona una base para el diseño de electrocatalizadores avanzados basados en óxido e hidróxido.
Videos de Conceptos Relacionados
02:37Oxidation of Alcohols
14.8K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
14.8K
01:15Oxidations of Aldehydes and Ketones to Carboxylic Acids
5.0K
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
5.0K
01:21Radical Oxidation of Allylic and Benzylic Alcohols
2.6K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.6K
01:33Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes
4.8K
Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
4.8K
01:19Aldehydes and Ketones with Alcohols: Hemiacetal Formation
8.5K
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.
8.5K
02:23Alcohols from Carbonyl Compounds: Reduction
11.5K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
11.5K