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Electrodeposition01:08

Electrodeposition

1.2K
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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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
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Electrode Engineering for High-Durability Variable-Emissivity Devices Based on Reversible Copper Electrodeposition.

Runyun He1, Tianwen Liu1, Liqiang Zhang1

  • 1Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

Ultra-thin iridium (Ir) electrodes significantly enhance the durability of variable emissivity devices. This breakthrough overcomes previous limitations, enabling stable thermal modulation for applications like advanced thermal regulation and infrared stealth.

Keywords:
cycling performancereversible copper electrodepositionultra‐thin metal electrodevariable emissivity devices

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Variable emissivity devices modulate infrared radiation for applications like thermal camouflage and energy efficiency.
  • Reversible metal electrodeposition offers spectral modulation but suffers from electrode degradation and instability.
  • Existing devices face challenges with cycling stability due to electrode degradation.

Purpose of the Study:

  • To develop a highly durable variable emissivity device using an ultra-thin iridium (Ir)-based electrode strategy.
  • To enhance the cycling stability and performance of reversible copper electrodeposition variable emissivity devices.
  • To investigate the potential of Ir-based electrodes for scalable, high-performance thermal modulation applications.

Main Methods:

  • Fabrication of variable emissivity devices utilizing ultra-thin Ir-based electrodes for reversible copper electrodeposition.
  • Performance testing of Ir-electrode devices, including cycling stability, radiative temperature variation, and emissivity modulation.
  • Comparison of Ir-electrode device performance against platinum (Pt)-based counterparts.
  • Integration of an Ir-Au grid composite electrode for homogeneous deposition and large-area device fabrication.
  • Incorporation of a Cr2O3 optical interference layer with an Ir electrode for dual-band modulation.

Main Results:

  • Ir-electrode devices showed only 11% degradation in radiative temperature variation after 8000 cycles, outperforming Pt-based devices.
  • Emissivity modulation in Ir-electrode devices attenuated by only 23% after 6000 cycles, significantly better than Pt-based devices.
  • Ir-based electrodes demonstrated superior stability due to chemical inertness, conductivity, and mechanical robustness.
  • Large-area rigid and flexible devices maintained performance over thousands of cycles.
  • Dual-band modulation devices achieved stability exceeding 10,000 cycles with a significant emissivity modulation range.

Conclusions:

  • The ultra-thin Ir-based electrode strategy dramatically improves the cycling stability and durability of variable emissivity devices.
  • Ir-based electrodes offer a viable solution for practical applications requiring long-term, reliable thermal modulation.
  • This advancement has significant implications for thermal regulation systems, IR stealth, and advanced display technologies.