Citation: Hang Zhao, Zhangqian Liang, Xiang Liu, Pengyuan Qiu, Hongzhi Cui, Jian Tian. Noble metal-like behavior of plasmonic Bi particles deposited on reduced TiO2 microspheres for efficient full solar spectrum photocatalytic oxygen evolution[J]. Chinese Journal of Catalysis, 2020, 41(2): 333-340. doi: S1872-2067(19)63428-5
具有贵金属行为的等离子Bi纳米颗粒负载到还原TiO2微米球及其高效全光谱光催化产氧
由于贵金属纳米粒子具有表面等离子体共振(SPR)效应,将贵金属(如金或者银)与TiO2结合是将光催化剂的光吸收边扩展到更长的波长一种有效途径.然而,贵金属的价格限制了它们的商业化,因此需要低成本的金属作为替代品.最近,金属铋(Bi)被证明是贵金属的理想替代品,具有明显的SPR效应,在可见光甚至近红外范围具有优异的光吸收性能.通过光还原,化学还原,水热还原等还原方法,可以方便地获得金属Bi.然而,通过原位沉积的方法将金属Bi纳米粒子直接沉积到半导体表面仍然是一个很大的挑战.
本文采用双金属有机骨架衍生的合成策略,通过调节合成温度,将金属Bi原位沉积到还原TiO2微球表面(Bi@R-TiO2).采用X射线衍射,扫描电镜,透射电镜,X射线光电子能谱,漫反射光谱,光致发光光谱,阻抗,光电流响应等表征技术对制备样品的结构和光学性能进行了研究.结果表明,通过乙二醇可以将Ti4+还原为Ti3+得到还原的TiOx,Bi3+同时也被还原为金属Bi.当退火温度控制在300℃时,相应的Bi@R-TiO2-300表现出最高的全光谱光催化产氧活性(4728.709μmol h-1 g-1),分别是的纯TiO2和Bi-Ti双金属有机框架的5.9和9.5倍.这可归因于以下三点:(1)金属Bi作为“电子受体”,加速了TiO2向Bi的载流子转移;(2)负载到还原TiO2表面的金属Bi具有SPR效应可以增强可见光和近红外光的吸收能力;(3) Ti3+的产生进一步减小TiO2的禁带宽度.
English
Noble metal-like behavior of plasmonic Bi particles deposited on reduced TiO2 microspheres for efficient full solar spectrum photocatalytic oxygen evolution
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Key words:
- Bi nanoparticles
- / Full solar spectrum
- / O2 evolution
- / Photocatalysis
- / Porous microspheres
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