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Piezotronics in Photo-Electrochemistry.

Yanhao Yu¹, Xudong Wang¹

¹Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, 53706, USA.

Advanced Materials (Deerfield Beach, Fla.)

|July 17, 2018

Summary

Piezotronics enhances solar energy conversion in photo-electrochemistry (PEC) by tuning electrode band structures. This review covers methods and results for improving PEC water splitting using piezoelectric and ferroelectric effects.

Keywords:

ferroelectrics heterojunctions interfacial band tuning photo-electrochemistry piezotronics

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Area of Science:

Photo-electrochemistry (PEC)
Piezotronics
Renewable energy conversion

Background:

Solar energy conversion into chemical compounds is crucial.
Photo-electrochemical system performance depends on interfacial electrical band energy.
Piezotronics offers a novel approach to tune interfacial energetics.

Purpose of the Study:

To review contemporary research coupling piezotronics with photo-electrochemistry.
To introduce quantitative band diagrams for polarization-tuned semiconductor-electrolyte junctions.
To discuss experimental advances and challenges in applying piezotronics to PEC systems.

Main Methods:

Utilizing intrinsic or deformation-induced ionic displacements (ferroelectric and piezoelectric polarizations).
Engineering interfacial charge distribution and band structures of PEC electrodes.
Analyzing quantitative band diagrams of semiconductor-electrolyte junctions.

Main Results:

Demonstrated enhancement of charge separation and transportation in PEC water splitting.
Improved surface kinetics for photo-electrochemical reactions.
Provided insights into the impact of interface chemistry on band energy landscapes.

Conclusions:

Piezotronics is a promising strategy for optimizing photo-electrochemical systems.
Ferroelectric and piezoelectric polarizations can significantly boost PEC performance.
Addressing current challenges will further unlock the potential of piezotronics in PEC applications.