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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Optimized intermediate layer formation and electroless plating methods to obtain supported dense Pd surfaces.

Gamze Gümüşlü Gür1,2, Berna Toprak1,2

  • 1Department of Chemical Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, İstanbul, Turkiye.

Turkish Journal of Chemistry
|March 28, 2024
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Summary

This study optimized palladium (Pd) electroless plating on alumina supports for high-purity hydrogen production. A novel method achieved a dense, uniform Pd coating without annealing, reducing costs and improving efficiency.

Keywords:
Dense metallic membranePdelectroless platinghydrogenintermediate layerlow temperature

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Palladium (Pd) and its alloys are crucial for ultra-pure hydrogen (H2) production via dense metallic membranes.
  • High costs of Pd necessitate composite membrane structures with thin Pd layers.
  • Achieving thin, dense, and uniform Pd layers on support materials remains a significant challenge.

Purpose of the Study:

  • To investigate the parametric analysis of gamma-alumina (γ-Al2O3) interlayer formation and electroless Pd plating (Pd ELP) on alpha-alumina (α-Al2O3) supports.
  • To develop a method for obtaining a thin, uniform Pd surface without requiring high-temperature annealing.
  • To optimize Pd ELP procedures for maximum yield and a defect-free surface.

Main Methods:

  • Parametric analysis of γ-Al2O3 interlayer formation using PEG/PVA concentration, dipping time, and heat treatment.
  • Optimization of Pd ELP by adjusting hydrazine concentration, heat treatment, and bath temperature.
  • Characterization of Pd/γ-Al2O3/α-Al2O3 structures using scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA).

Main Results:

  • A thin γ-Al2O3 interlayer was successfully formed on α-Al2O3, minimizing pore size and density.
  • Optimized Pd ELP conditions, including sequential hydrazine addition (1 M) at 30 °C and 120 °C heat treatment between baths, yielded a dense, uniform 13 μm Pd coating.
  • The developed method achieved a high-quality Pd coating without annealing, outperforming literature methods.

Conclusions:

  • The study successfully developed an annealing-free method for fabricating thin, dense, and uniform Pd coatings on γ-Al2O3-coated α-Al2O3 supports.
  • Optimized electroless Pd plating parameters and interlayer formation are key to cost-effective and efficient hydrogen separation membranes.
  • This approach offers a promising alternative for producing ultra-pure hydrogen economically.