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Abnormal Cathodic Photocurrent Generated on an n-Type FeOOH Nanorod-Array Photoelectrode.
Hongjun Chen1, Miaoqiang Lyu1, Gang Liu2
1Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 17, 2016
Summary
Researchers developed a novel iron oxyhydroxide (FeOOH) nanorod photoelectrode. This electrode exhibits an unusual cathodic photocurrent, offering insights for designing advanced photoelectrochemical devices.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Photoelectrode development is crucial for efficient solar energy conversion.
- Understanding photocurrent generation mechanisms is key to optimizing photoelectrochemical devices.
Purpose of the Study:
- To synthesize and characterize an FeOOH nanorod-array photoelectrode.
- To investigate the unique cathodic photocurrent phenomenon observed in FeOOH.
- To elucidate the role of Fe(IV) species in photocurrent generation.
Main Methods:
- Wet-chemical synthesis of FeOOH nanorod arrays on fluorine-doped tin oxide (FTO) glass.
- Calcination to convert FeOOH to hematite, preserving nanorod morphology.
- Electrochemical measurements under illumination to study photocurrent.
- Analysis of Fe(IV) species' role in photocurrent generation.
Main Results:
- Successfully synthesized vertically aligned FeOOH nanorods (approx. 35 nm diameter, 300 nm length).
- Observed an abnormal cathodic photocurrent in FeOOH, distinct from hematite.
- Demonstrated tunability of photocurrent via electrochemical treatments.
- Identified higher valence Fe(IV) species as critical for cathodic photocurrent.
Conclusions:
- FeOOH nanorod arrays exhibit unique photoelectrochemical properties.
- Fe(IV) species play a vital role in the observed cathodic photocurrent.
- This study provides a foundation for designing novel photoelectrochemical devices.
