1. Polarization-Switchable Electrochemistry of 2D Layered Bi2O2Se Bifunctional Microreactors by Ferroelectric Modulation
- Author
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Chiang, Chun-Hao, Yu, Chun-Hung, Lu, Yang-Sheng, Yang, Yueh-Chiang, Lin, Yin-Cheng, Chen, Hsin-An, Ho, Sheng-Zhu, Chen, Yi-Chun, Kumatani, Akichika, Chang, Chen, Kuo, Pai-Chia, Shiue, Jessie, Li, Shao-Sian, Chiu, Po-Wen, and Chen, Chun-Wei
- Abstract
Ferroelectric catalysts are known for altering surface catalytic activities by changing the direction of their electric polarizations. This study demonstrates polarization-switchable electrochemistry using layered bismuth oxyselenide (L-Bi2O2Se) bifunctional microreactors through ferroelectric modulation. A selective-area ionic liquid gating is developed with precise control over the spatial distribution of the dipole orientation of L-Bi2O2Se. On-chip microreactors with upward polarization favor the oxygen evolution reaction, whereas those with downward polarization prefer the hydrogen evolution reaction. The microscopic origin behind polarization-switchable electrochemistry primarily stems from enhanced surface adsorption and reduced energy barriers for reactions, as examined by nanoscale scanning electrochemical cell microscopy. Integrating a pair of L-Bi2O2Se microreactors consisting of upward or downward polarizations demonstrates overall water splitting in a full-cell configuration based on a bifunctional catalyst. The ability to modulate surface polarizations on a single catalyst via ferroelectric polarization switching offers a pathway for designing catalysts for water splitting.
- Published
- 2024
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