Choe Huicheol, Kim Soong Yeon, Zhao Shufang, Cha Byeong Jun, Grehl Thomas, Brüner Philipp, Kim Young Dok
Department of Chemistry, Sungkyunkwan University, Suwon 16419, Korea.
Center of Scientific Instrumentation, Korea Basic Science Institute, Ochang Center, Cheongju 28119, Chungbuk, Korea.
ACS Appl Mater Interfaces. 2022 May 25;14(20):24028-24038. doi: 10.1021/acsami.2c04118. Epub 2022 May 13.
Commercial rutile TiO particles capped with AlO and ZrO layers, which are widely used in white pigments, can serve as a starting material for the fabrication of visible light-responsive photocatalysts toward gas-phase NO oxidation. The as-received TiO with iron impurities exhibited reduced photocatalytic activity, and the activity was boosted by the deposition of additional iron comparable in quantity to the intrinsic iron impurity level. Analyses using X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectroscopy, and low-energy ion scattering spectroscopy revealed that the deposited iron and intrinsic impurity iron are dissimilar in terms of location, oxidation states, and interaction with TiO. This suggests that tracking the structure and impurity levels of photocatalyst elements can be crucial for understanding structure-activity relationships of real catalysts.
包覆有AlO和ZrO层的商用金红石型TiO颗粒广泛应用于白色颜料中，可作为制备用于气相NO氧化的可见光响应型光催化剂的起始材料。所接收的含有铁杂质的TiO表现出降低的光催化活性，通过沉积与固有铁杂质水平相当数量的额外铁，活性得到了提高。使用X射线光电子能谱、飞行时间二次离子质谱和低能离子散射光谱进行的分析表明，沉积的铁和固有杂质铁在位置、氧化态以及与TiO的相互作用方面存在差异。这表明追踪光催化剂元素的结构和杂质水平对于理解实际催化剂的构效关系可能至关重要。
