Journal
LANGMUIR
Volume 37, Issue 35, Pages 10588-10593Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c01845
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan [JP16H06327, JP16H06504, JP17H01061]
- International Joint Research Promotion Program of Osaka University [J171013014, J171013007, Ja19990011]
- JSPS
- National Natural Science Foundation of China (NSFC) [JSPSNSFC J191053055]
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Research has shown that the terminal hydroxyl (OHt) on the surface of titanium dioxide is in a negatively charged state, with unique characteristics different from bridging hydroxyl (OHbr), involving amphoterism and diversity of catalytic reactions of titanium dioxide.
Titanium dioxide (TiO2) is of considerable interest as a photocatalyst and a catalyst support. Surface hydroxyl groups (OH) are the most common adsorbates on the TiO2 surface and are believed to play crucial roles in their applications. Although the characteristics of bridging hydroxyl (OHbr) have been well understood, the adsorption structure and charged states of terminal hydroxyl (OHt) have not yet been experimentally elucidated at an atomic scale. In this study, we have investigated an isolated OHt on the rutile TiO2(110) surface by atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). We found that OH, is in a negatively charged state. The unique characteristic of OHt is different from that of OHbr and involves the amphoterism and diversity of catalytic reactions of TiO2.
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