Polarization-Switchable Electrochemistry of 2D Layered Bi<sub>2</sub>O<sub>2</sub>Se Bifunctional Microreactors by Ferroelectric Modulation

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-Bi<sub>2</sub>O<sub>2</sub>Se) 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-Bi<sub>2</sub>O<sub>2</sub>Se. 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-Bi<sub>2</sub>O<sub>2</sub>Se 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.

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Publication Details

Journal
Nano Letters
Published
2024-08-26
DOI
https://doi.org/10.1021/acs.nanolett.4c03128
Citations
8
Primary Topic
Electrocatalysts for Energy Conversion
Type
article
Field-Weighted Citation Impact
0.82

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article

Polarization-Switchable Electrochemistry of 2D Layered Bi2O2Se Bifunctional Microreactors by Ferroelectric Modulation

C. C. Chiang, Po‐Wen Chiu, Hsin‐An Chen, Pai‐Chia Kuo et al.
8 citations
Nano Letters
Electrocatalysts for Energy Conversion
0.82
article

Polarization-Switchable Electrochemistry of 2D Layered Bi2O2Se Bifunctional Microreactors by Ferroelectric Modulation

C. C. Chiang, Po‐Wen Chiu, Hsin‐An Chen, Pai‐Chia Kuo, Sheng‐Zhu Ho, Jessie Shiue, Shao‐Sian Li, Chun-Hung Yu, Akichika Kumatani, Chang Chen, Yi‐Chun Chen, Yueh-Chiang Yang, Chun‐Wei Chen, Yin-Cheng Lin, Yang-Sheng Lu
article en
8 citations

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-Bi<sub>2</sub>O<sub>2</sub>Se) 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-Bi<sub>2</sub>O<sub>2</sub>Se. 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-Bi<sub>2</sub>O<sub>2</sub>Se 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.

Nano LettersVol. 24(35)
National Taipei University of Technology (TW), National Taiwan University (TW), Tohoku University (JP), National Tsing Hua University (TW), Japan Science and Technology Agency (JP), Institute of Atomic and Molecular Sciences, Academia Sinica (TW), Institute for Materials Research, Tohoku University, Chiba Institute of Technology (JP), National Cheng Kung University (TW)
Academia Sinica, National Tsing Hua University, National Taiwan University, National Taipei University of Technology, National Cheng Kung University, National Science and Technology Council, Japan Society for the Promotion of Science, Japan Science and Technology Agency, Division of Materials Research, Precursory Research for Embryonic Science and Technology
Openalex Percentile: Top 33%
Electrocatalysts for Energy Conversion
0.82
DOIOpen Access PDFOpenAlex
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