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Interface and surface engineering of hematite photoanode for efficient solar water oxidation
Xiangyan Chen1, Yanming Fu1, Liu Hong2
1International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.
The Journal of Chemical Physics
|July 3, 2020
Summary
This study engineered a novel photoanode using iron oxide nanorods coated with titanium dioxide and cobalt oxide for efficient solar water splitting. The new material significantly boosts hydrogen production through improved charge transfer and catalysis.
Area of Science:
- Materials Science
- Electrochemistry
- Renewable Energy
Background:
- Efficient photoelectrochemical (PEC) water splitting requires optimized semiconductor photoelectrodes.
- Improving charge transfer and water redox reaction kinetics is crucial for high-performance PEC devices.
Purpose of the Study:
- To engineer the interface and surface of semiconductor photoelectrodes for enhanced solar water oxidation.
- To develop a novel photoanode based on α-Fe2O3 nanorods coated with TiO2 and CoOx for efficient solar-driven water splitting.
Main Methods:
- Fabrication of α-Fe2O3 nanorods successively coated with TiO2 and CoOx thin layers.
- Characterization of the α-Fe2O3/TiO2/CoOx photoanode's performance in PEC water splitting.
- Analysis of charge transfer dynamics and surface reaction kinetics.
Main Results:
- The α-Fe2O3/TiO2/CoOx photoanode demonstrated a 3.3-fold increase in photocurrent density compared to bare α-Fe2O3.
- The TiO2 layer facilitated heterojunction formation for improved charge separation and passivated surface defects.
- The CoOx layer acted as an effective oxygen evolution catalyst, reducing overpotential.
Conclusions:
- Interface and surface engineering of α-Fe2O3 based photoanodes is a viable strategy for efficient solar water oxidation.
- The developed α-Fe2O3/TiO2/CoOx photoanode shows significant potential for solar fuel production.
- This work highlights a collaborative approach to designing advanced photoelectrode materials for PEC applications.
