(Português) Divulgação de chamada para bolsa PNPD junto ao PPGFSC/UFSC
(Português) Relato da 167ª Reunião Ordinária do Colegiado Delegado do Programa de Pós-Graduação em Física da UFSC
Qualifying Examination for Doctoral Thesis of Daniel Salvador – 31/March/2015 – tuesday-4:20 pm
The Physics Graduate Program invites everyone to:
Qualifying Examination for Doctoral Thesis
Daniel Salvador
TRANSIÇÕES DE FASE NO MODELO DE POTTS COM MODULAÇÃO APERIÓDICA
Defense Committee:
Prof. Dr. Nilton da Silva Branco – (president) – FSC/UFSC
Prof. Dr. Jürgen Fritz Stilck – (external member) – UFF/IF
Prof. Dr. Wagner Figueiredo – (local member) – UFSC/FSC
Prof. Dr. Daniel Girardi – (local member) – UFSC/Blumenau
Prof. Dr. Marcelo Henrique Romano Tragtenberg – (supplementary member) – UFSC/FSC
Date: 31/March/2015 – tuesday – Time: 4:20 pm – Place: Auditório do LAED – (piso térreo do Departamento de Matemática)
Defence of M.Sc. dissertation of Luiza Gomes Ferreira – 31/March/2015 – 10:00 am
The Physics Graduate Program invites everyone to:
Defence of M.Sc. dissertation
Luiza Gomes Ferreira
UM MODELO SIMPLIFICADO PARA A DINÂMICA DE MOTORES MOLECULARES
Defense Commitee
Prof. Dr. Wagner Figueiredo – (president) – UFSC/FSC
Profª. Drª. Carla Goldman – (external member) – USP/IF
Prof. Dr. Nilton da Silva Branco – (local member) – UFSC/FSC
Prof. Dr. Lucas Nicolao – (local member) – UFSC/FSC
Prof. Dr. Eduardo Cerutti Mattei – (supplementary member) – UFSC/FSC
Date: 31/March/2015 – tuesday – Time: 10:00 am – Place: Sala 212 – Auditório do Departamento de Física
Defence of M.Sc. dissertation of Rodrigo Sergio Tiedt – 31/March/2015 – 2:00 pm
The Physics Graduate Program invites everyone to:
Defence of M.Sc. dissertation
Rodrigo Sergio Tiedt
EFEITO DA RADIAÇÃO ULTRAVIOLETA NA FORMAÇÃO DE NÚCLEOS DE CONDENSAÇÃO DE NUVENS EM MISTURAS DE ÁGUA E DIMETILSULFETO
Defense Commitee
Prof. Dr. Manoel Gustavo Petrucelli Homem – (president) – UFSCar/QMC
Prof. Dr. Reinaldo Luiz Cavasso Filho – (external member) – UFABC/CCNH
Prof. Dr. Renato Ramos da Silva – (local member) – UFSC/Meteorologia
Prof. Dr. Danilo de Paiva Almeida – (local member) – UFSC/FSC
Prof. Dr. Wendell Rondinelli Gomes Farias – (supplementary member) – UFSC/FSC
Date: 31/March/2015 – tuesday – Time: 2:00 pm – Place: Sala 212 – Auditório do Departamento de Física
Seminar with prof. Prof. Dr. Giovanni Zangari – 27/March/2015 – 10h15min
THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:
Hydrogen from Sunlight – Photoelectrochemical Water Splitting with Li-doped TiO2 Nanotubes
Prof. Dr. Giovanni Zangari
Department of Materials Science and Engineering, University of Virginia – Charlottesville, VA, USA
Abstract:
While solar energy is one of the few energy sources capable of meeting the world’s energy demands,1 the transient nature of sunlight necessitates the development of technologies to store that energy for on-demand use to supplement photovoltaics.2 Photoelectrochemical solar cells use sunlight to electrolyze water to produce hydrogen as a storable fuel, which can then be converted to electricity by a fuel cell. TiO2 nanotubes formed by the anodization of titanium foils in electrolytes containing fluoride ions produce aligned arrays of tube-like structures 70-100 nm in width and tunable length on the order of microns as shown in Figure 1(a, b). These structures are a promising architecture for photoelectrochemical applications3 because of their high stability in solution and under irradiation, high surface area, and 1-dimensional charge transport for efficient movement of photogenerated charges. While hundreds of microns long nanotubes in principle may be grown, one major limitation on the performance of TiO2 nanotubes is the presence of defects in the crystal structure which facilitate the recombination of photogenerated electron-hole pairs;4 the best photoelectrochemical performance of TiO2 nanotubes for water splitting has been observed in Nb-doped TiO2 with a length of 7 mm and an associated photocurrent of 1.0 mA/cm2.5 Electrochemical Li doping was demonstrated to passivate the trap states in TiO2 nanotubes, suppressing recombination. This process resulted in up to a 2 fold increase in the photoelectrochemical performance of 1 mm long TiO2 nanotubes compared to the undoped samples.6 For long TiO2 nanotubes, a new optimum length of 15 mm was achieved, resulting in 1.5 mA/cm2 of photocurrent at 1.0 VSCE under simulated sunlight as seen in Figure 1(c). These results demonstrate the ability to produce high performance TiO2 nanotubes for photoelectrochemical solar energy devices using simple electrochemical techniques.
Figure 1. (a) Cross section and (b) surface view of TiO2 nanotubes grown by anodization. (c) Lithium intercalation enhances the photocurrent by trap state passivation, resulting in up to 1.5 mA/cm2 of photocurrent at 15 m.
References
(1) Lewis, N. S.; Nocera, D. G. Proc. Natl. Acad. Sci. U. S. Amer. 2006, 103, 15729.
(2) Cook, T. R.; Dogutan, D. K.; Reece, S. Y.; Surendranath, Y.; Teets, T. S.; Nocera, D. G. Chem. Rev. 2010, 110, 6474.
(3) Tsui, L. -k.; Zangari, G. J. Electrochem. Soc. 2014, 161, D3066
(4) Tsui, L.; Zangari, G. Electrochim. Acta 2014, 121, 203.
(5) Das, C.; Roy, P.; Yang, M.; Jha, H.; Schmuki, P. Nanoscale 2011, 3, 3094.
(6) Tsui, L.; Saito, M.; Homma, T.; Zangari, G. J. Mater. Chem. A 2015, 3, 360.
Date: 27/March/2015 – (friday) – Place: Sala 212 – Auditório do Departamento de Física- Time: 10h15min
Qualifying Examination for Doctoral Thesis of Paulo Roberto Innocente – 13/March/2015 – friday-10:00 am
The Physics Graduate Program invites everyone to:
Qualifying Examination for Doctoral Thesis
Paulo Roberto Innocente
Estudo da Geração de H2 com Fotocatodo de Cu2O
Defense Committee:
Prof. Dr. André Avelino Pasa – (president) – FSC/UFSC
Prof. Dr. Andre Santarosa Ferlauto – (external member) – UFMG/FSC
Prof. Dr. Rafael Gallina Delatorre – (local member) – UFSC – Joinville
Prof. Dr. Kleber Ersching – (local member) – IFC/Camboriú
Drª Silvia Pelegrini – (supplementary member) – UFSC/FSC
Date: 13/March/2015 – friday – Time: 10:00 am – Place: Sala 114 – Sala de Reuniões do Departamento de Física
Qualifying Examination for Doctoral Thesis of Juan Camilo Macias Ramirez – 20/March/2015 – friday-10:00 am
The Physics Graduate Program invites everyone to:
Qualifying Examination for Doctoral Thesis
Juan Camilo Macias Ramirez
Confinamento e Susceptibilidade da Matéria Hadrônica em Teoria de Perturbação Otimizada
Defense Committee:
Prof. Dr. Marcus Emmanuel Benghi Pinto – (president) – FSC/UFSC
Prof. Dr. Sidney dos Santos Avancini – (external member) – UFSC/FSC
Prof. Dr. Celso de Camargo Barros Junior – (Local member) – UFSC/FSC
Prof. Dr. Paulo Juliano Liebgott – (local member) – UFSC/FSC
Date: 20/March/2015 – friday – Time: 10:00 am – Place: Sala de Aula 206 – Departamento de Física
Doctoral Thesis defence of Robson Lourenço Cavalcanti – 19/March/2015 – thursday – Times: 2:00 pm
The Physics Graduate Program invites everyone to:
Defense of Doctoral Thesis
Robson Lourenço Cavalcanti
Caracterização impedimétrica do crescimento de camadas porosas em ITO
Defense Committee:
Profª. Drª. Maria Luisa Sartorelli – (president) – FSC/UFSC
Prof. Dr. Antonio Riul Júnior – (external member) – IF/UNICAMP
Drª Edna Regina Spada – (external member) – USP/IFSC
Prof. Dr. Lucas Natálio Chavero – (membro titular) – UFSC/Blumenau
Profª. Drª. Françoise Toledo Reis – (local member) – UFSC/FSC
Profª. Drª. Marta Elisa Rosso Dotto – (local member) – UFSC/FSC
Date: 19/March/2015 – thursday – Times: 2:00 pm – Place: Sala 212 – Auditório do Departamento de Física