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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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Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO
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Optimized Copper-Modified Zinc Oxide Photoanodes for Solar-to-Hydrogen Evolution.

Premrudee Promdet1, Fan Cui2, Raul Quesada-Cabrera1,3

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ACS Applied Materials & Interfaces
|January 10, 2026
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Summary
This summary is machine-generated.

This study developed cost-effective copper-modified zinc oxide photoanodes using chemical vapor deposition. Optimized copper loading enhanced photocurrent and efficiency for hydrogen production via photocatalysis.

Keywords:
chemical vapor depositioncopper-modified zinc oxidecost-efficient photoanodesphotoelectrochemical hydrogen evolutionplasmonic photocatalysts

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photocatalysis

Background:

  • Developing efficient and cost-effective photoanodes is crucial for sustainable hydrogen production.
  • Zinc oxide (ZnO) is a promising semiconductor material, but its photocatalytic efficiency needs enhancement.
  • Copper (Cu) modification can improve the optoelectronic properties of ZnO.

Purpose of the Study:

  • To present a scalable, single-step method for producing cost-efficient copper-modified zinc oxide (Cu-ZnO) photoanodes.
  • To investigate the effect of copper incorporation on ZnO photoanode performance.
  • To enhance the stability of the photoanodes for photoelectrochemical (PEC) applications.

Main Methods:

  • Scalable chemical vapor deposition (CVD) for Cu-ZnO photoanode fabrication.
  • Optimization of copper loading in ZnO films.
  • Characterization using photoluminescence spectroscopy.
  • Protection layer deposition via atomic layer deposition (ALD) of amorphous TiO2.
  • Photoelectrochemical (PEC) cell testing.

Main Results:

  • An optimized Cu-ZnO sample (CZO-5.6) achieved a stable photocurrent of 1.22 mA cm⁻² at 1.23 VRHE with 89% Faradaic efficiency.
  • Surface plasmon resonance (SPR) effects from copper nanoparticles enhanced performance.
  • Amorphous TiO2 coatings provided excellent stability in alkaline solutions and efficient hole transport.

Conclusions:

  • A cost-efficient method for producing high-performance Cu-ZnO photoanodes was demonstrated.
  • Copper modification and TiO2 protection significantly improve photocatalytic activity and stability.
  • This approach offers a low-cost route for developing efficient photocatalysts for hydrogen production.