Author
A.G. Muñoz
Other affiliations: Universidad Nacional del Sur, Helmholtz-Zentrum Berlin, University of Düsseldorf
Bio: A.G. Muñoz is an academic researcher from University of Erlangen-Nuremberg. The author has contributed to research in topics: Oxide & Corrosion. The author has an hindex of 20, co-authored 43 publications receiving 1216 citations. Previous affiliations of A.G. Muñoz include Universidad Nacional del Sur & Helmholtz-Zentrum Berlin.
Topics: Oxide, Corrosion, Chloride, Passivation, Aluminium
Papers
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TL;DR: In this article, anodic TiO 2 nanotube layers were fabricated by anodization of titanium in 1.5% HF electrolyte at 20V, this results in nanotubular layers with a thickness of 1.1μm with individual tube diameter of 100 ± 10nm and a tube wall thickness of 10± 2nm.
205 citations
TL;DR: In this article, the potential dependence of the interfacial capacity under different electrolyte and illumination conditions was analyzed by means of potential dependence on the potential of anodic grown TiO2-nanotubes, and the experimental results offer evidence for duplex oxide film conformed by the bottom and wall of pores with different density of donors and concentration of surface states.
141 citations
TL;DR: In this paper, the electrochemical behavior of Al-Zn-In based alloys in chloride media was investigated using potentiodynamic techniques, complemented by SEM, EDX and TEM.
99 citations
TL;DR: In this article, the photophysics of light absorption, excitation energy transfer to catalytically active sites and interfacial reactions at the catalyst/solution phase boundary are discussed.
Abstract: An overview on processes that are relevant in light-induced fuel generation, such as water photoelectrolysis or carbon dioxide reduction, is given. Considered processes encompass the photophysics of light absorption, excitation energy transfer to catalytically active sites and interfacial reactions at the catalyst/solution phase boundary. The two major routes envisaged for realization of photoelectrocatalytic systems, e.g. bio-inspired single photon catalysis and multiple photon inorganic or hybrid tandem cells, are outlined. For development of efficient tandem cell structures that are based on non-oxidic semiconductors, stabilization strategies are presented. Physical surface passivation is described using the recently introduced nanoemitter concept which is also applicable in photovoltaic (solid state or electrochemical) solar cells and first results with p-Si and p-InP thin films are presented. Solar-to-hydrogen efficiencies reach 12.1% for homoepitaxial InP thin films covered with Rh nanoislands. In the pursuit to develop biologically inspired systems, enzyme adsorption onto electrochemically nanostructured silicon surfaces is presented and tapping mode atomic force microscopy images of heterodimeric enzymes are shown. An outlook towards future envisaged systems is given.
92 citations
TL;DR: In this article, the authors investigated lithium insertion into highly ordered nanotubular layers of TiO 2 and its electrochromic effects and found that the cathodic behavior of tubes in the "as formed" amorphous phase and annealed to anatase were studied in a solution of 1 M LiCl0 4 in acetonitrile.
Abstract: The present work investigates lithium insertion into highly ordered nanotubular layers of TiO 2 and its electrochromic effects. The nanotubes were formed by anodization of titanium in 1 M (H 3 PO 4 ) + 1 M (NaOH) + 0.5wt% HF electrolyte at 20 V. This leads to nanotubular layers with a thickness of 1 ± 0.1 μm, individual tube diameter of 100 ± 10 nm and a tube wall thickness of 10 ± 2 nm. The cathodic behavior of tubes in the "as formed" amorphous phase and annealed to anatase were studied in a solution of 1 M LiCl0 4 in acetonitrile. Cyclic voltammograms and potential step experiments combined with reflectance measurements show for anatase nanotubes a well defined uptake potential for Li + and a very strong and reversible electrochromic effect, while on the other investigated TiO 2 structures the effects were much less pronounced.
72 citations
Cited by
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TL;DR: The field of photocatalysis can be traced back more than 80 years to early observations of the chalking of titania-based paints and to studies of the darkening of metal oxides in contact with organic compounds in sunlight as discussed by the authors.
5,729 citations
TL;DR: This review attempts to cover all aspects, including underlying principles and key functional features of TiO(2), in a comprehensive way and also indicates potential future directions of the field.
Abstract: TiO(2) is one of the most studied compounds in materials science. Owing to some outstanding properties it is used for instance in photocatalysis, dye-sensitized solar cells, and biomedical devices. In 1999, first reports showed the feasibility to grow highly ordered arrays of TiO(2) nanotubes by a simple but optimized electrochemical anodization of a titanium metal sheet. This finding stimulated intense research activities that focused on growth, modification, properties, and applications of these one-dimensional nanostructures. This review attempts to cover all these aspects, including underlying principles and key functional features of TiO(2), in a comprehensive way and also indicates potential future directions of the field.
2,735 citations
TL;DR: Transparent conductors (TCs) have a multitude of applications for solar energy utilization and for energy savings, especially in buildings as discussed by the authors, which leads naturally to considerations of spectral selectivity, angular selectivity, and temporal variability of TCs, as covered in three subsequent sections.
1,471 citations
TL;DR: A solar energy based technology to recycle carbon dioxide into readily transportable hydrocarbon fuel (i.e., a solar fuel) would help reduce atmospheric CO2 levels and partly fulfill energy demands within the present hydrocarbon based fuel infrastructure.
Abstract: The past several decades have seen a significant rise in atmospheric carbon dioxide levels resulting from the combustion of hydrocarbon fuels. A solar energy based technology to recycle carbon dioxide into readily transportable hydrocarbon fuel (i.e., a solar fuel) would help reduce atmospheric CO2 levels and partly fulfill energy demands within the present hydrocarbon based fuel infrastructure. We review the present status of carbon dioxide conversion techniques, with particular attention to a recently developed photocatalytic process to convert carbon dioxide and water vapor into hydrocarbon fuels using sunlight.
1,357 citations
TL;DR: In this article, an overview and review on self-organized TiO2 nanotube layers and other transition metal oxide tubular structures grown by controlled anodic oxidation of a metal substrate is given.
Abstract: The present paper gives an overview and review on self-organized TiO2 nanotube layers and other transition metal oxide tubular structures grown by controlled anodic oxidation of a metal substrate We describe mechanistic aspects of the tube growth and discuss the electrochemical conditions that need to be fulfilled in order to synthesize these layers Key properties of these highly ordered, high aspect ratio tubular layers are discussed In the past few years, a wide range of functional applications of the layers have been explored ranging from photocatalysis, solar energy conversion, electrochromic effects over using the material as a template or catalyst support to applications in the biomedical field A comprehensive view on state of the art is provided
1,242 citations