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Related Concept Videos

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.
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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.
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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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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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Copper-Based Reversible Metal Electrodeposition Devices with Transparent, Blue, Red, and Mirror States.

Woo-Seok Choi1, Ji-Hyeong Lee1,2, Kwang-Mo Kang1,2

  • 1School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 31253, Republic of Korea.

ACS Applied Materials & Interfaces
|December 4, 2025
PubMed
Summary

This study introduces a novel copper-based device for smart windows, achieving four optical states including blue and red colors. This cost-effective technology offers efficient light control for adaptive displays and energy-saving buildings.

Keywords:
ITO nanoparticlecoppermulticolorreversible metal electrodepositionstep-voltage

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Optics

Background:

  • Reversible metal electrodeposition devices (RMEDs) offer tunable optical properties via metal deposition/dissolution, unlike traditional electrochromic devices.
  • Silver-based RMEDs show multicolor switching but are expensive; copper is a cheaper alternative but previously limited to monochromatic operation.
  • Controlling copper nucleation and growth is key to achieving multicolor capabilities in copper-based RMEDs.

Purpose of the Study:

  • To develop a cost-effective, multicolor copper-based RMED for smart windows and adaptive displays.
  • To overcome limitations in copper electrodeposition for achieving multiple distinct optical states.

Main Methods:

  • A dual-electrode design using nanoparticle-decorated ITO (NITO) and smooth flat ITO (FITO) was employed.
  • Specific voltage protocols (constant-voltage and step-voltage) were applied to control copper deposition and induce localized surface plasmon resonance (LSPR).
  • Optical properties, including transmittance, color difference, and switching times, were characterized.

Main Results:

  • The device demonstrated reversible switching among four optical states: transparent, blue, red, and mirror.
  • Achieved distinct blue and red coloration via wavelength-specific LSPR absorption (700 nm and 550 nm, respectively).
  • High optical modulation (ΔT: 55.8–72.2%) and significant color differences (ΔE: 33.7 for blue, 42.8 for red) were observed.
  • Responsive switching times (coloration ~10 s, bleaching 9.8–17.9 s) and moderate cycling stability (>80% after 100 cycles) were achieved.

Conclusions:

  • A breakthrough copper-based RMED was developed, enabling multicolor switching for the first time in such systems.
  • The dual-electrode design and tailored voltage protocols effectively control copper deposition for tunable optical properties.
  • This technology presents a viable, cost-effective solution for multicolor electrochromic applications in smart windows and adaptive optics.