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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.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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.
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Hydrogen Production and Utilization in a Membrane Reactor

Hydrogen Production and Utilization in a Membrane Reactor

Published on: March 10, 2023

Pseudo-Pt Monolayer for Robust Hydrogen Oxidation.

Tonghui Zhao¹, Mengting Li², Dongdong Xiao³

¹Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan430074, China.

Journal of the American Chemical Society

|February 3, 2023

Summary

This summary is machine-generated.

A novel pseudomorphic-Pt atomic layer (PmPt) catalyst on an IrPd-core matrix shows significantly enhanced activity and stability for alkaline hydrogen oxidation reactions compared to standard Pt/C catalysts.

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Heteroepitaxial core-shell structures offer synergistic benefits for advanced catalytic applications.
Developing efficient and stable catalysts is crucial for hydrogen oxidation reactions in alkaline media.

Purpose of the Study:

To synthesize and characterize a pseudomorphic-Pt atomic layer (PmPt) epitaxially grown on an IrPd-core matrix (PmPt@IrPd/C).
To evaluate the catalytic performance and stability of the PmPt@IrPd/C catalyst for alkaline hydrogen oxidation reactions.
To investigate the underlying mechanisms for enhanced activity and stability.

Main Methods:

Epitaxial growth of pseudomorphic-Pt atomic layer on IrPd-core/carbon support.
Electrochemical testing for hydrogen oxidation reaction (HOR) activity and durability in alkaline electrolyte.
Accelerated stability testing over 50,000 cycles.
Anion-exchange membrane fuel cell (AEMFC) performance evaluation.

Main Results:

PmPt@IrPd/C demonstrated a mass activity enhancement of approximately 29.2 times over benchmark Pt/C for alkaline HOR.
The catalyst exhibited a 25.0 times greater enhancement in activity after a 50,000-cycle stability test.
Enhanced stability is attributed to resistance to carbon corrosion and modulated hydroxyl adsorption.
AEMFCs with ultralow Pt loading (0.009 mgPt cm⁻²) using PmPt@IrPd/C achieved a power density of 1.27 W cm⁻².

Conclusions:

The PmPt@IrPd/C core-shell catalyst represents a significant advancement in alkaline hydrogen oxidation catalysis.
This novel structure offers superior activity, stability, and potential for reduced platinum utilization in fuel cells.
The findings pave the way for developing next-generation catalysts for clean energy applications.