TY - JOUR
T1 - Ti as Mediator in the Photoinduced Electron Transfer of Mixed-Metal NH2-UiO-66(Zr/Ti)
T2 - Transient Absorption Spectroscopy Study and Application in Photovoltaic Cell
AU - Santiago Portillo, Andrea
AU - Baldoví, Herme G.
AU - García Fernandez, Maria Teresa
AU - Navalón, Sergio
AU - Atienzar, Pedro
AU - Ferrer, Belen
AU - Álvaro, Mercedes
AU - García, Hermenegildo
AU - Li, Z.
N1 - Funding Information:
Financial support by the Spanish Ministry of Economy and Competitiveness (CTQ2014-53292-R-AR, Severo Ochoa, CTQ2015-69153-CO2-R) is gratefully acknowledged. S.N. is thankful for financial support by Fundación Ramón Areces (XVIII Concurso Nacional, Ciencias de la Vida y de la Materia, Energía renovable: materiales y procesos 2016).
Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/3/30
Y1 - 2017/3/30
N2 - A series of mixed-metal NH2-UiO-66(Zr/Ti) with different percentages of exchanged Ti have been prepared and studied by transient absorption spectroscopy (TAS). The photogenerated transients from mixed NH2-UiO-66(Zr/Ti) exhibit at short time scales two defined absorption bands, evolving to a continuous absorption band expanding from 300 to 700 nm at longer time scales. The observed spectral changes are compatible with an initial formation of Ti3+-O-Zr4+ and its further transformation to Ti4+-O-Zr3+ via metal-metal electron exchange, thus providing support to the role of substituted Ti as mediator to facilitate electron transfer from excited ligand to the (Zr/Ti)6O4(OH)4 nodes in mixed NH2-UiO-66(Zr/Ti). The slow recombination of photogenerated electrons and holes in the mixed NH2-UiO-66(Zr/Ti) has been advantageously used for the construction of a photovoltaic cell fabricated with the mixed NH2-UiO-66(Zr/Ti), reaching a higher photon-to-current efficiency than NH2-UiO-66(Zr). (Chemical Equation Presented).
AB - A series of mixed-metal NH2-UiO-66(Zr/Ti) with different percentages of exchanged Ti have been prepared and studied by transient absorption spectroscopy (TAS). The photogenerated transients from mixed NH2-UiO-66(Zr/Ti) exhibit at short time scales two defined absorption bands, evolving to a continuous absorption band expanding from 300 to 700 nm at longer time scales. The observed spectral changes are compatible with an initial formation of Ti3+-O-Zr4+ and its further transformation to Ti4+-O-Zr3+ via metal-metal electron exchange, thus providing support to the role of substituted Ti as mediator to facilitate electron transfer from excited ligand to the (Zr/Ti)6O4(OH)4 nodes in mixed NH2-UiO-66(Zr/Ti). The slow recombination of photogenerated electrons and holes in the mixed NH2-UiO-66(Zr/Ti) has been advantageously used for the construction of a photovoltaic cell fabricated with the mixed NH2-UiO-66(Zr/Ti), reaching a higher photon-to-current efficiency than NH2-UiO-66(Zr). (Chemical Equation Presented).
UR - http://www.scopus.com/inward/record.url?scp=85019909620&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.6b13068
DO - 10.1021/acs.jpcc.6b13068
M3 - Article
AN - SCOPUS:85019909620
SN - 1932-7447
VL - 121
SP - 7015
EP - 7024
JO - Journal of Physical Chemistry C: Nanomaterials and interfaces
JF - Journal of Physical Chemistry C: Nanomaterials and interfaces
IS - 12
ER -
