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Polarization-Switchable Electrochemistry of 2D Layered Bi2O2Se Bifunctional Microreactors by Ferroelectric Modulation
Journal
Nano Letters
Journal Volume
24
Journal Issue
35
Start Page
11012
End Page
11019
ISSN
1530-6984
1530-6992
Date Issued
2024-08-26
Author(s)
Chun-Hao Chiang
Chun-Hung Yu
Yang-Sheng Lu
Yueh-Chiang Yang
Yin-Cheng Lin
Hsin-An Chen
Sheng-Zhu Ho
Yi-Chun Chen
Akichika Kumatani
Chen Chang
Pai-Chia Kuo
Jessie Shiue
Shao-Sian Li
Po-Wen Chiu
DOI
10.1021/acs.nanolett.4c03128
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.
Subjects
2D materials
ferroelectric polarization
microreactors
switchable electrochemistry
water splitting
Publisher
American Chemical Society (ACS)
Type
journal article