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Related Concept Videos

Catalysis02:50

Catalysis

23.1K
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.
23.1K
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
143
Processes at Electrodes01:30

Processes at Electrodes

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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
104

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Related Experiment Video

Updated: May 6, 2026

Functionalization and Dispersion of Carbon Nanomaterials Using an Environmentally Friendly Ultrasonicated Ozonolysis Process
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Interface-driven Pd-Ag-Cu/C nanocomposites with increased oxygen reduction reaction kinetics.

Rashmi Chetry1, Shaheen Parveez Bhuyan1, Rupjyoti Dutta2,3

  • 1Department of Chemical Sciences, Tezpur University, Tezpur-784028, Assam, India. pankajb@tezu.ernet.in.

Nanoscale
|August 22, 2025
PubMed
Summary

A novel palladium-silver-copper nanocomposite catalyst (Pd₃Ag₀.₅Cu₀.₅/C) shows enhanced oxygen reduction reaction (ORR) activity and stability. This platinum-free catalyst offers a promising alternative for fuel cell applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Developing efficient and stable electrocatalysts is crucial for advancing fuel cell technology.
  • Platinum-based catalysts are effective but expensive and scarce.
  • Alternative non-precious metal catalysts are needed for widespread adoption.

Purpose of the Study:

  • To synthesize and characterize highly dispersed Pd₃Ag₀.₅Cu₀.₅/C nanocomposites.
  • To evaluate the electrocatalytic performance of the synthesized nanocomposites for the oxygen reduction reaction (ORR).
  • To assess the catalyst's stability and methanol tolerance for fuel cell applications.

Main Methods:

  • Solvothermal synthesis method for creating multimetallic nanocomposites.
  • Structural characterization using techniques like X-ray diffraction and electron microscopy.
  • Electrochemical testing including cyclic voltammetry (CV) and linear sweep voltammetry (LSV).

Main Results:

  • Successfully synthesized Pd₃Ag₀.₅Cu₀.₅/C nanocomposites with well-distributed metal domains on a carbon support.
  • Demonstrated enhanced ORR kinetics due to interface-driven electronic modulation between Pd, Ag, and Cu.
  • Achieved high current density (-5.84 mA cm⁻²), early onset potential (0.94 V vs. RHE), and favorable half-wave potential (0.80 V vs. RHE).

Conclusions:

  • The Pd₃Ag₀.₅Cu₀.₅/C nanocomposite exhibits superior ORR performance compared to other catalysts.
  • Enhanced activity is attributed to structural integrity, uniform active site dispersion, and strong carbon support interaction.
  • The catalyst shows excellent methanol tolerance and durability, indicating its potential as a Pt-free alternative for fuel cells.