钽酸盐
光催化
半导体
材料科学
锶
纳米颗粒
带隙
甲烷
钯
激发
催化作用
光化学
纳米技术
化学工程
光电子学
化学
有机化学
电气工程
工程类
电介质
铁电性
作者
Haoyang Jiang,Xiaobo Peng,Akira Yamaguchi,Shigenori Ueda,Takeshi Fujita,Hideki Abe,Masahiro Miyauchi
出处
期刊:Solar RRL
[Wiley]
日期:2019-04-24
卷期号:3 (7)
被引量:18
标识
DOI:10.1002/solr.201900076
摘要
Partial oxidation of methane (POM) to syngas is a credible approach to utilize natural gas resources effectively. However, the high reaction temperature required in thermocatalysis decreases the cost–performance ratio. A scheme for photocatalytic POM is proposed using palladium (Pd) nanoparticles loaded onto strontium tantalate (Sr 2 Ta 2 O 7 ), an ultrawide‐bandgap (UWBG) semiconductor. UV irradiation initiates POM at temperatures lower than 423 K and promotes the reaction efficiency below 873 K as compared with the dark conditions. The photogenerated hot carriers that arise from the d to s interband excitation of Pd drive the photocatalytic reaction, rather than the bandgap excitation of the semiconductor support. It is demonstrated that the combination of a UWBG semiconductor and metal nanoparticles is conducive to the migration and separation of hot carriers. The suppressed activities of frequently used wide‐gap semiconductors such as TiO 2 loaded with Pd are attributed to the competition between bandgap excitation in semiconductors and interband excitation in metal nanoparticles.
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