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Related Concept Videos

Electrochemical Systems01:24

Electrochemical Systems

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Electrochemical Cells01:28

Electrochemical Cells

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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...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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.
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...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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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.
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Electronic Modulation via a Pd-CeO2 Heterointerface for Superior Alkaline Hydrogen Oxidation.

Minhui Zhong1, Qingzhen Xu1, Wenhai Xu1

  • 1Department of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.

Molecules (Basel, Switzerland)
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Summary

Developing advanced catalysts for anion exchange membrane fuel cells (AEMFCs) is crucial. This study engineered a palladium-ceria/nitrogen-doped carbon (Pd-CeO2/NC) catalyst, significantly boosting hydrogen oxidation reaction (HOR) kinetics and stability.

Keywords:
Pd-based catalystsalkaline hydrogen oxidationelectrocatalysiselectronic modulationheterointerface

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Sluggish hydrogen oxidation reaction (HOR) kinetics in alkaline media hinder anion exchange membrane fuel cell (AEMFC) performance.
  • Optimizing adsorption of hydrogen (*H) and hydroxide (*OH) intermediates is key for efficient HOR catalysis.

Purpose of the Study:

  • To engineer a novel catalyst with a heterointerface for synergistic optimization of *H and *OH adsorption.
  • To investigate the electronic effects of a Pd-CeO2 heterointerface on HOR activity.

Main Methods:

  • Fabrication of a Pd-CeO2/NC catalyst via heterointerface construction.
  • Utilized spectroscopic studies and theoretical calculations to analyze electronic structure and intermediate adsorption.
  • Evaluated catalyst performance through electrochemical measurements, including exchange current density and CO tolerance.

Main Results:

  • The Pd-CeO2/NC catalyst demonstrated optimized *H and *OH adsorption by downshifting the Pd d-band center.
  • Achieved an exceptional exchange current density of 3.66 mA cm-2, double that of commercial Pt/C.
  • Exhibited excellent long-term stability and high activity with 1000 ppm CO tolerance.

Conclusions:

  • Metal-oxide heterointerface engineering effectively regulates electronic structures for multi-intermediate optimization.
  • The Pd-CeO2/NC catalyst presents a promising design principle for advanced alkaline HOR electrocatalysts in AEMFCs.