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Related Concept Videos

Electrodeposition01:08

Electrodeposition

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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Development and Validation of Chromium Getters for Solid Oxide Fuel Cell Power Systems
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Selective electroplated chromium blacks.

B Window, I T Ritchie, K Cathro

    Applied Optics
    |March 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Electrodeposition of chrome black selective surfaces involves depositing a chromium oxide dielectric layer, followed by chromium metal particles. The dielectric layer

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    Area of Science:

    • Materials Science
    • Surface Engineering
    • Thin Film Deposition

    Background:

    • Selective surfaces are crucial for solar thermal energy applications.
    • Chrome black coatings offer high solar absorptance and tunable thermal emittance.
    • Understanding the electrodeposition process is key to optimizing coating performance.

    Purpose of the Study:

    • To investigate the electrodeposition of chrome black selective surfaces.
    • To analyze the influence of plating time on film properties.
    • To correlate optical and physical characteristics with deposition parameters.

    Main Methods:

    • Electrochemical deposition of chrome black on polished metal substrates.
    • Optical property measurements (solar absorptance, thermal emittance).
    • Analysis of deposit weight, surface profile, and film composition.

    Main Results:

    • A lossy dielectric film (Cr2O3) of 0.6 µm is deposited in the first 50 seconds.
    • Most of the dielectric film (0.4-0.5 µm) detaches between 50-60 seconds of plating.
    • An absorbing layer of chromium particles forms on the remaining dielectric, creating the selective surface.
    • Theoretical models accurately predict film properties using measured deposit weights.

    Conclusions:

    • The thickness of the residual dielectric layer significantly impacts the solar absorptance and thermal emittance trade-off.
    • Optimizing plating time is essential for achieving desired selective surface performance.
    • The study provides insights into the formation mechanism of chrome black coatings for solar applications.