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Spatially Separated Redox Cocatalysts on Ferroelectric Nanoplates for Improved Piezophotocatalytic CO Reduction and HO Oxidation. | LitMetric

Spatially Separated Redox Cocatalysts on Ferroelectric Nanoplates for Improved Piezophotocatalytic CO Reduction and HO Oxidation.

ACS Appl Mater Interfaces

Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Materials Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, China.

Published: March 2023

Utilizing solar and mechanical vibration energy for catalytic CO reduction and HO oxidation is emerging as a promising way to simultaneously generate renewable energy and mitigate climate change, making it possible to integrate two energy resources into a reaction system for artificial piezophotosynthesis. However, the practical applications are hindered by undesirable charge recombination and sluggish surface reaction in the photocatalytic and piezocatalytic processes. This study proposes a dual cocatalyst strategy to overcome these obstacles and improve the piezophotocatalytic performance of ferroelectrics in overall redox reactions. With the photodeposition of AuCu reduction and MnO oxidation cocatalysts on oppositely poled facets of PbTiO nanoplates, band bending occurs along with the formation of built-in electric fields on the semiconductor-cocatalyst interfaces, which, together with an intrinsic ferroelectric field, piezoelectric polarization field, and band tilting in the bulk of PbTiO, provide strong driving forces for the directional drift of piezo- and photogenerated electrons and holes toward AuCu and MnO, respectively. Besides, AuCu and MnO enrich the active sites for surface reactions, significantly reducing the rate-determining barrier for CO-to-CO and HO-to-O transformation, respectively. Benefiting from these features, AuCu/PbTiO/MnO delivers remarkably improved charge separation efficiencies and significantly enhanced piezophotocatalytic activities in CO and O generation. This strategy opens a door for the better coupling of photocatalysis and piezocatalysis to promote the conversion of CO with HO.

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Source
http://dx.doi.org/10.1021/acsami.2c20685DOI Listing

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