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The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Multilayer oxide protection layer with multiple tunnelling paths for efficient and durable Si-based photocathode.

Yang Zhou^1,2, Zijie Cheng¹, Yanhong Lyu³

¹State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Hunan University, Changsha, PR China.

Nature Communications

|January 17, 2026

Summary

Researchers developed a novel oxide/metal multilayer architecture to overcome the efficiency-durability trade-off in photoelectrochemical devices. This design enables low-resistance carrier transport and enhanced corrosion resistance for practical applications.

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Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Constructing effective oxide protection layers for photoelectrochemical devices is crucial but challenging.
Oxide layer thickness presents a trade-off between carrier transport efficiency and corrosion resistance (durability).

Purpose of the Study:

To decouple the efficiency-durability trade-off in oxide protection layers for photoelectrochemical devices.
To introduce a universal approach using oxide/metal (O/M)n architecture with multiple carrier-tunneling paths.

Main Methods:

Fabrication of oxide/metal multilayer structures ((O/M)n).
Application of the approach to various oxide-based layers like (TiO2/Fe)n, (CeO2/Fe)n, and (TiO2/Pd)n.
Systematic photoelectrochemical-electrical measurements and simulation models to analyze carrier dynamics.

Main Results:

The (O/M)n architecture enables low-resistance carrier transport for high efficiency.
Sufficiently thick layers are achievable, reinforcing durability and corrosion resistance.
Established a correlation between carrier dynamics and the oxide/metal architecture.

Conclusions:

The proposed (O/M)n approach successfully decouples the efficiency-durability trade-off in oxide protection layers.
This method offers a universal strategy applicable to various oxide materials for practical photoelectrodes.
Provides insights into controlling carrier transport in complex multilayer structures for advanced photoelectrochemical devices.