| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Vesborg, Peter Christian Kjærgaard
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2023Continuous-flow electrosynthesis of ammonia by nitrogen reduction and hydrogen oxidationcitations
- 2022Quantitative operando detection of electro synthesized ammonia using mass spectrometrycitations
- 2021Semitransparent Selenium Solar Cells as a Top Cell for Tandem Photovoltaicscitations
- 2020Parallel evaluation of the BiI3, BiOI, and Ag3BiI6 layered photoabsorberscitations
- 2019A rigorous electrochemical ammonia synthesis protocol with quantitative isotope measurementscitations
- 2019Shining Light on Sulfide Perovskites: LaYS 3 Material Properties and Solar Cellscitations
- 2019Shining Light on Sulfide Perovskites: LaYS3 Material Properties and Solar Cellscitations
- 2017Sulfide perovskites for solar energy conversion applications: computational screening and synthesis of the selected compound LaYS 3citations
- 2017Sulfide perovskites for solar energy conversion applications: computational screening and synthesis of the selected compound LaYS3citations
- 2015Crystalline TiO 2 : A Generic and Effective Electron-Conducting Protection Layer for Photoanodes and -cathodescitations
- 2015Crystalline TiO2: A Generic and Effective Electron-Conducting Protection Layer for Photoanodes and -cathodescitations
- 2014Iron-Treated NiO as a Highly Transparent p-Type Protection Layer for Efficient Si-Based Photoanodescitations
- 2014Protection of p+-n-Si Photoanodes by Sputter-Deposited Ir/IrOxThin Filmscitations
- 2013Using TiO2 as a Conductive Protective Layer for Photocathodic H2 Evolutioncitations
- 2010Note: Anodic bonding with cooling of heat-sensitive areascitations
- 2009Dynamics of Surface Exchange Reactions Between Au and Pt for HER and HORcitations
Places of action
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article
Using TiO2 as a Conductive Protective Layer for Photocathodic H2 Evolution
Abstract
Surface passivation is a general issue for Si-based photoelectrodes because it progressively hinders electron conduction at the semiconductor/electrolyte interface. In this work, we show that a sputtered 100 nm TiO2 layer on top of a thin Ti metal layer may be used to protect an n+p Si photocathode during photocatalytic H2 evolution. Although TiO2 is a semiconductor, we show that it behaves like a metallic conductor would under photocathodic H2 evolution conditions. This behavior is due to the fortunate alignment of the TiO2 conduction band with respect to the hydrogen evolution potential, which allows it to conduct electrons from the Si while simultaneously protecting the Si from surface passivation. By using a Pt catalyst the electrode achieves an H2 evolution onset of 520 mV vs NHE and a Tafel slope of 30 mV when illuminated by the red part (λ > 635 nm) of the AM 1.5 spectrum. The saturation photocurrent (H2 evolution) was also significantly enhanced by the antireflective properties of the TiO2 layer. It was shown that with proper annealing conditions these electrodes could run 72 h without significant degradation. An Fe2+/Fe3+ redox couple was used to help elucidate details of the band diagram.