Video Experimental Relacionado

Updated: Jul 28, 2025

Hydrogen Production and Utilization in a Membrane Reactor

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Mejora de la tasa de reacción de oxidación de hidrógeno de Ru por hidrógeno activo en la capa intermedia ultrafina de

Xianmeng Song¹, Xia-Guang Zhang², Yong-Liang Deng¹

¹State Key Laboratory of Physical Chemistry of Solid Surfaces, IChEM, College of Chemistry and Chemical Engineering, Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society

|June 2, 2023

Resumen

Este estudio mejora la actividad del catalizador de rutenio (Ru) para la reacción de oxidación de hidrógeno (HOR) en las pilas de combustible de membrana de intercambio aniónico (AEMFC). Un nuevo nanocatalizador Au@Pd@Ru almacena temporalmente hidrógeno, impulsando el Ru

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Catálisis

Sus antecedentes:

Los catalizadores de rutenio (Ru) muestran una actividad limitada en la reacción de oxidación de hidrógeno (HOR) debido a la alta oxofílicidad, lo que dificulta la reducción del costo de la célula de combustible de membrana de intercambio aniónico (AEMFC).
El desarrollo de electrocatalizadores eficientes es crucial para el avance de la tecnología AEMFC.

Objetivo del estudio:

Aclarar el mecanismo detrás de la actividad catalítica de Ru mejorada para HOR.
Investigar el papel de una capa intermedia de paladio (Pd) en los nanocatalizadores basados en Ru.

Principales métodos:

Espectroscopia de Raman mejorada en la superficie in situ (SERS) para detectar intermedios de reacción.
Difracción de rayos X in situ para el análisis estructural.
Caracterización electroquímica.
Cálculos de la Teoría Funcional de la Densidad (DFT).

Principales resultados:

El nanocatalizador Au@Pd@Ru demostró una mejora en la actividad de los HOR.
El SERS in situ proporcionó pruebas directas del hidroxilo intermedio (OHad).
Los cálculos de DFT apoyaron el mecanismo propuesto.

Conclusiones:

La capa intermedia de paladio facilita el almacenamiento temporal de hidrógeno, mejorando la actividad catalítica de Ru en potenciales anódicos.
Este mecanismo implica el desbordamiento de hidrógeno a una interfaz deficiente en hidrógeno para la reacción con OHad.
Los hallazgos ofrecen nuevas estrategias para el diseño de electrocatalizadores avanzados para AEMFC.

Más Videos Relacionados

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

Videos de Conceptos Relacionados

Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride

Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...