Polar Layered Bismuth-Rich Oxyhalide Piezoelectrics Bi_4O_5X_2 (X=Br, I): Efficient Piezocatalytic Pure Water Splitting and Interlayer Anion-Dependent Activity

Chunyang Wang; Cheng Hu; Fang ChenHaitao LiYihe ZhangTianyi MaHongwei Huang

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Polar Layered Bismuth-Rich Oxyhalide Piezoelectrics Bi_4O_5X_2 (X=Br, I): Efficient Piezocatalytic Pure Water Splitting and Interlayer Anion-Dependent Activity

机译：Polar Layered Bismuth-Rich Oxyhalide Piezoelectrics Bi_4O_5X_2 (X=Br, I): Efficient Piezocatalytic Pure Water Splitting and Interlayer Anion-Dependent Activity

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Piezocatalytic pure water splitting for H2 evolution carries the virtuesof efficacious utilization of mechanical energy, easy operation, andhigh value-added products, while lacking desirable piezoelectrics forhigh chemical energy production. Here, two polar layered bismuth-richoxyhalides Bi_4O_5X_2 (X=Br, I) thin nanosheets (≈4 nm) are first exploitedas efficient piezocatalysts to be capable of dissociating pure water. Theunique asymmetrical layered structures of Bi_4O_5X_2 (X=Br, I) composed ofthe interleaved [Bi_4O_5]~（2+） layer and double X? ions slabs along the [1 0 1_]orientation cause large intrinsic dipole moment, excellent piezoelectricityand easy deformation. Without any cocatalyst and sacrificial agent, Bi_4O_5Br_2and Bi_4O_5I_2 thin nanosheets display remarkable piezocatalytic H_2 productionrate of 1149.0 and 764.5 μmol g~(?1) h~(?1), respectively, standing among thebest piezocatalysts, accompanied by H_2O_2 and hydroxyl radicals (·OH)as oxidative products. The smaller radius and higher electronegativityof interleaved Br than I cause a more strongly polar crystal structure inBi_4O_5Br_2, contributing to the higher piezocatalytic activity compared toBi_4O_5I_2. This study broadens the scope of piezoelectric materials appliedto sustainable energy catalysis by efficiently converting mechanical energyand illustrates the importance of crystal configuration and composition infabricating efficient piezocatalytic systems.

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来源
《Advanced functional materials》 |2023年第29期|2301144.1-2301144.12|共12页
作者
Chunyang Wang; Cheng Hu; Fang ChenHaitao LiYihe ZhangTianyi MaHongwei Huang;
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作者单位

Engineering Research Center of Ministry of Education for GeologicalCarbon Storage and Low Carbon Utilization of ResourcesBeijing Key Laboratory of Materials Utilization of Nonmetallic Mineralsand Solid WastesNational Laboratory of Mineral MaterialsSchool;

School of Chemistry and Chemical EngineeringYangzhou UniversityYangzhou 225002, P. R. China;

School of ScienceRMIT UniversityMelbourne VIC 3000, Australia;

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bismuth-rich oxyhalides; dipole moment; H2 evolution; piezocatalytic pure water splitting; piezoelectricity;

Polar Layered Bismuth-Rich Oxyhalide Piezoelectrics Bi_4O_5X_2 (X=Br, I): Efficient Piezocatalytic Pure Water Splitting and Interlayer Anion-Dependent Activity

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