材料科学
催化作用
分解水
压电
铋
化学工程
氧气
半导体
析氧
空位缺陷
钛酸酯
环境修复
纳米技术
光催化
物理化学
光电子学
电极
陶瓷
污染
复合材料
化学
工程类
有机化学
冶金
生物
生物化学
电化学
生态学
结晶学
作者
Ashok Ranjan,Kai‐Yuan Hsiao,Chin-Ho Lin,Yu-Han Tseng,Ming‐Yen Lu
标识
DOI:10.1021/acsami.2c07817
摘要
Piezoelectric materials have demonstrated applicability in clean energy production and environmental wastewater remediation through their ability to initiate a number of catalytic reactions. In this study, we used a conventional sol-gel method to synthesize lead-free rhombohedral R3c bismuth sodium titanate (BNT) particles of various sizes. When used as a piezocatalyst to generate H2 through water splitting, the BNT samples provided high production rates (up to 506.70 μmol g-1 h-1). These piezocatalysts also degraded the organic pollutant methylene blue (MB, 20 mg L-1) with high efficiency (up to k = 0.039 min-1), suggesting their potential to treat polluted water. Finally, we found that the piezopotential caused band tilting in the semiconductor and aided charge transfer such that recombination was suppressed and the rate of H2 production increased. The mechanism of piezoelectric catalysis involved oxygen vacancies, the size of the catalyst, and the internal electric field playing important roles to enhance electron-hole separation, which further enhanced the catalysis reactions.
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