Ranjan Ashok, Hsiao Kai-Yuan, Lin Cheng-Yi, Tseng Yu-Han, Lu Ming-Yen
Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2 Kuang Fu Road, Hsinchu 300, Taiwan.
High Entropy Materials Center, National Tsing Hua University, 101, Sec. 2 Kuang Fu Road, Hsinchu 300, Taiwan.
ACS Appl Mater Interfaces. 2022 Aug 10;14(31):35635-35644. doi: 10.1021/acsami.2c07817. Epub 2022 Jul 29.
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 3 bismuth sodium titanate (BNT) particles of various sizes. When used as a piezocatalyst to generate H through water splitting, the BNT samples provided high production rates (up to 506.70 μmol g h). These piezocatalysts also degraded the organic pollutant methylene blue (MB, 20 mg L) with high efficiency (up to = 0.039 min), 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 H 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.
压电材料通过引发多种催化反应的能力，已在清洁能源生产和环境废水修复中展现出适用性。在本研究中，我们采用传统的溶胶-凝胶法合成了不同尺寸的无铅菱面体3铋钠钛酸盐（BNT）颗粒。当用作通过水分解产生氢气的压电催化剂时，BNT样品具有较高的产率（高达506.70 μmol g h）。这些压电催化剂还能高效降解有机污染物亚甲基蓝（MB，20 mg L）（高达 = 0.039 min），表明它们具有处理污水的潜力。最后，我们发现压电势导致半导体中的能带倾斜并有助于电荷转移，从而抑制了复合并提高了氢气产生速率。压电催化的机制涉及氧空位、催化剂尺寸和内部电场在增强电子-空穴分离方面发挥重要作用，这进一步增强了催化反应。
