| Full text | |
| Author(s): |
da Silva, Andre L.
;
Bettini, Jefferson
;
Bernardes, Andre A. .
;
Castro, Ricardo H. R. .
;
Gouvea, Douglas
Total Authors: 5
|
| Document type: | Journal article |
| Source: | Journal of Physical Chemistry C; v. N/A, p. 12-pg., 2023-01-12. |
| Abstract | |
Titanium dioxide nanoparticles are of particular interest in photocatalysis and artificial photosynthesis studies. Their properties are dependent on parameters such as the crystal polymorph, for example, anatase/rutile phases, the specific surface area, and the capacity to adsorb CO2 and H2O gas molecules. A cause-effect relationship exists between those parameters, the surface thermochem-istry, and the performance in application. Howe v e r , the lack of systematic thermodynamic data has hindered a more comprehensive understanding to enable control. This work investigates the relation-ship between the surface thermochemistry of alkaline earth metals doped TiO2 and the associated micro and nanostructural features. TiO2 nanoparticles doped with Mg2+, Ca2+, Sr2+ , or Ba2+ showed spontaneous segregation of dopants to the nanoparticles' interfaces, leading to incremental surface energy reduction as directly measured by microcalorimetry of adsorption. The phenomenon was a direct function of ionic radius and led to the improved thermal stability of the nanoparticles against coarsening , stabilizing the anatase polymorph, and increasing the specific surface area. (AU) | |
| FAPESP's process: | 22/04150-6 - Study of nanoceramics for energy application: sintering and interface |
| Grantee: | Flavio Leandro de Souza |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |
| FAPESP's process: | 20/15230-5 - Research Centre for Greenhouse Gas Innovation - RCG2I |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |