Identification and characterization of titania photocatalyst powders using their energy-resolved distribution of electron traps as a fingerprint
Identification and characterization of titania photocatalyst powders using their energy-resolved distribution of electron traps as a fingerprint
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DOI：
10.1016/j.cattod.2017.12.020
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发表时间：
2019-02-01
期刊：
影响因子：
5.3
通讯作者：
Ohtani, Bunsho
中科院分区：
文献类型：
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作者：
Nitta, Akio;Takashima, Mai;Ohtani, Bunsho
在这里，我们报告识别的粉末二氧化钛，最重要的金属氧化物之一，其能量分辨分布的电子陷阱（ERDT），作为一个指纹，测量反向双光束光声光谱（RDB-PAS）。结合导电带底（CBB）的位置数据，由普通PAS测量的各种二氧化钛粉末和其他金属氧化物粉末的ERDT图案是不同的，这取决于样品的种类。对于给定的一对样品，评价ERDT/CBB图案的重合度（ζ），作为ERDT图案匹配的每个重合度、电子陷阱的总密度和CBB位置的乘积。从容器中靠近位置收集的二氧化钛样品表现出较高的zeta值，而具有不同代号的样品显示出较低的zeta值，除了以相同方式制备但编码不同的成对样品。结果表明，zeta值越大，样品的光催化活性符合程度越高。ERDT/CBB模式阵列排列在三个反应体系中的光催化活性的顺序建议每个光催化反应的优选模式。
Here we report identification of powders of titania, one of the most important metal oxides, with their energy-resolved distribution of electron traps (ERDT), as a fingerprint, measured by reversed double-beam photoacoustic spectroscopy (RDB-PAS). The ERDT patterns combined with conduction-band bottom (CBB) position data measured by ordinary PAS for various titania powders and other metal-oxide powders were different depending on the kind of sample. The degree of coincidence (zeta) of ERDT/CBB patterns was evaluated for a given pair of samples as a product of each degree of coincidence for ERDT-pattern matching, total density of electron traps and CBB position. Titania samples collected from close positions in a container exhibited high values of zeta, while samples with different code names showed low values of zeta, except for pairs of samples prepared in the same way but coded differently. It was shown that the higher was the values of zeta, the higher was the degree of coincidence for photocatalytic activity of titania samples. ERDT/CBB-pattern arrays arranged in the order of photocatalytic activities in three reaction systems suggested preferable patterns for each photocatalytic reaction.