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Interface Engineering and its Effect on WO₃-Based Photoanode and Tandem Cell.

Yang Liu^1,2, Bryan R Wygant², Oluwaniyi Mabayoje²

¹College of Chemistry and Chemical Engineering , Central South University , Changsha 410083 , China.

ACS Applied Materials & Interfaces

|April 3, 2018

Summary

Modifying tungsten oxide (WO3) photoanodes by etching or Ga2O3 passivation significantly improves photoelectrochemical (PEC) water splitting performance. These interfacial engineering strategies enhance oxygen evolution and boost tandem cell photocurrent by over twofold.

Keywords:

WO3 etching passivation solar water splitting surface states tandem cell

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Area of Science:

Materials Science
Electrochemistry
Photocatalysis

Background:

Photoelectrochemical (PEC) water splitting relies on efficient charge transfer at electrode interfaces.
Surface trap states and Fermi pinning in photoelectrodes impede charge transport and affect performance.
Understanding interfacial properties is crucial for optimizing PEC devices.

Purpose of the Study:

To investigate the impact of interfacial properties on WO3-based photoanodes for PEC water splitting.
To evaluate the effectiveness of etching and Ga2O3 passivation in mitigating surface defects.
To assess the performance enhancement in WO3-based tandem solar cells.

Main Methods:

Synthesis of plate-like WO3 array films via aqueous chemical growth.
Surface treatments including etching and Ga2O3 passivation.
Electrochemical characterization: Mott-Schottky, linear sweep voltammetry, and oxygen evolution reaction (OER) measurements.
Fabrication and testing of WO3-based photoanode tandem cells with dye-sensitized solar cells.

Main Results:

Pristine WO3 exhibited surface trap states and Fermi pinning, limiting performance.
Etching and Ga2O3 passivation treatments reduced surface defects, enhancing OER activity and Faradaic efficiency.
Loading FeOOH catalyst synergistically improved photocurrent with surface treatments.
Modified WO3 photoanodes in tandem cells achieved a 2.42-fold increase in photocurrent density compared to pristine WO3.

Conclusions:

Interfacial engineering of WO3 photoanodes is critical for improving PEC water splitting efficiency.
Surface passivation and etching effectively mitigate charge transfer limitations.
Optimized WO3-based photoanodes show significant potential for efficient solar hydrogen production in tandem devices.