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

作者：C. C. Chiang, Chun-Hung Yu, Yang-Sheng Lu, Yueh-Chiang Yang, Yin-Cheng Lin, Hsin‐An Chen, Sheng‐Zhu Ho, Yi‐Chun Chen, Akichika Kumatani, Chang Chen, Pai‐Chia Kuo, Jessie Shiue, Shao‐Sian Li, Po‐Wen Chiu, Chun‐Wei Chen · 发表于：Nano Letters · 年份：2024 · DOI：10.1021/acs.nanolett.4c03128 · 被引用次数：11 · 研究领域：Electrocatalysts for Energy Conversion、2D Materials and Applications、Advanced Photocatalysis Techniques

High Resolution Image Download MS PowerPoint Slide 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 2 O 2 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 2 O 2 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 2 O 2 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.