Ariadne Köche- PhD
- PhD at Federal University of Rio Grande do Sul
Ariadne Köche
- PhD
- PhD at Federal University of Rio Grande do Sul
researching semiconductors for artificial photosynthesis
About
9
Publications
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Introduction
PhD in Materials Science. Works on synthesis of photo(electro)catalysts, such as perovskites and ferrites. Interested in the topics: semiconductors for photocatalysis, synthesis of nanostructured materials, hydrogen production by water splitting and characterization of advanced materials.
Current institution
Additional affiliations
March 2018 - March 2020
September 2022 - February 2023
Education
July 2020 - December 2024
March 2018 - April 2020
March 2013 - December 2017
Publications
Publications (9)
Copper‐tantalate, Cu2Ta4O11 (CTO), shows significant promise as an efficient photocathode for multi‐carbon compounds (C2+) production through photoelectrochemical (PEC) CO2 reduction, owing to its suitable energy bands and catalytic surface. However, synthesizing CTO poses a significant challenge due to its metastable nature and thermal instability...
Bismuth vanadate (BiVO4) has been used as an efficient photocatalyst for water oxidation. However, pristine BiVO4 suffers from recombination due to its short hole diffusion length and fast
electron-hole recombination, which hinders photocatalytic water oxidation. To enhance the water photo-oxidation, here we constructed Zn-doped BiVO4 and then depo...
Ta3N5, with its 2.1 eV bandgap and favorable band edge positions, is a promising compound for solar water splitting. However, its performance is limited by defective states introduced during high...
Engineering the photogenerated charge transfer through the solid–liquid interface is a key factor in boosting the solar energy conversion device performance, particularly, for BiVO4, which suffers recombination due to its short hole diffusion length and faster e–/h+ recombination. Site-selective cocatalysts have a strong potential to scavenge holes...
In this work, we address a knowledge gap regarding how cation and anion doping affect the stability and optoelectronic properties of Cs3Sb2I9 perovskites. We have employed Density Functional Theory (DFT) to investigate structures doped with Ag, In, Mo, Nb, Sc, Bi, Br and Cl in both 0D hexagonal P63/mmc and 2D trigonal P
m1 Cs3Sb2I9 polymorphs. Our...
Obtaining phase pure and highly crystalline SrTaO2N from its oxide precursors solid–solid mixture requires very high nitridation temperatures (above 1000 °C), which promote structural defects and sintering. To obtain free-standing SrTaO2N nanotubes (NTs) for the first time while preserving their tubular morphology, here we developed a methodology u...
Application of photocatalysts that strongly absorb within the visible range is a common strategy to improve the efficiency of photoelectrochemical (PEC) systems; this may translate to high photocurrents, but it is not always the case. Here, we show that nitrogen doping enhances visible light absorption of TiO2; however, it does not necessarily resu...
In order to allow quantum dots with the desired physical and chemical properties, the fine control and prediction of size during chemical syntheses is a challenge that must be addressed. In this work, we applied machine learning algorithms, with information extracted from scientific papers, to identify the most important variables in the synthesis...
Perovskites of transition metal oxynitride are emerging materials with promising electronic and optical properties that show great potential as solar-driven photocatalysts for water splitting. Since photocatalysis is a surface and so a morphology dependent process, synthesis of nanostructured semiconductors for this application is desirable. In thi...
