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Álvaro Valdés
Researcher at National University of Colombia
Publications - 56
Citations - 1604
Álvaro Valdés is an academic researcher from National University of Colombia. The author has contributed to research in topics: Ab initio & Potential energy surface. The author has an hindex of 19, co-authored 54 publications receiving 1364 citations. Previous affiliations of Álvaro Valdés include Spanish National Research Council & University of Antioquia.
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Oxidation and Photo-Oxidation of Water on TiO2 Surface
TL;DR: In this article, the authors investigated the relative stability of different surface terminations of TiO2 interacting with H2O and analyzed the overpotential needed for the electrolysis and photoelectrolysis of water.
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Solar hydrogen production with semiconductor metal oxides: new directions in experiment and theory
Álvaro Valdés,Álvaro Valdés,Jérémie Brillet,Michael Grätzel,Hildur Gudmundsdóttir,Heine Anton Hansen,Hannes Jónsson,Hannes Jónsson,P. Klüpfel,Geert-Jan Kroes,Florian Le Formal,Isabela C. Man,Rafael Da Silva Martins,Jens K. Nørskov,Jan Rossmeisl,Kevin Sivula,Aleksandra Vojvodic,Michael Zäch +17 more
TL;DR: An overview of a collaborative experimental and theoretical effort toward efficient hydrogen production via photoelectrochemical splitting of water into di-hydrogen and di-oxygen is presented in this article, where state-of-the-art experimental studies using hematite and TiO(2) functionalized with gold nanoparticles as photoanode materials, and theoretical studies on electro and photo-catalysis of water on a range of metal oxide semiconductor materials, including recently developed implementation of self-interaction corrected energy functionals.
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First principles study of the photo-oxidation of water on tungsten trioxide (WO3)
Álvaro Valdés,Geert-Jan Kroes +1 more
TL;DR: The photo-oxidation of water on the monoclinic P2(1)/nWO(3) (200, 020, and 002) surfaces is investigated using density functional theory calculations, employing the PW91-generalized gradient approximation, and the method developed by Norskov et al.
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Cluster Study of the Photo-Oxidation of Water on Rutile Titanium Dioxide (TiO2)
Álvaro Valdés,Geert-Jan Kroes +1 more
TL;DR: In this article, the photo-oxidation of water on the rutile TiO2 (110) surface was investigated using density functional theory calculations using a stable (TiO2)26 cluster.
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Towards an understanding of the vibrational mode specificity for dissociative chemisorption of CH4 on Ni(111): a 15 dimensional study
TL;DR: This work presents a fifteen-dimensional vibrational mode following calculation along the minimum energy path (MEP) of the dissociative chemisorption of CH(4) on Ni(111), based on density functional theory (DFT), and finds that pre-exciting the symmetric stretch vibration should be approximately 3 times as efficient in promoting reaction as pre- Exciting the asymmetric stretch vibrations.