| 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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Fermín, David J.
University of Bristol
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (37/37 displayed)
- 2024Activating Mn Sites by Ni Replacement in α-MnO2citations
- 2024Correlating molecular precursor interactions with device performance in solution-processed Cu2ZnSn(S,Se)4 thin-film solar cellscitations
- 2022Correlating Orbital Composition and Activity of LaMnxNi1–xO3 Nanostructures toward Oxygen Electrocatalysiscitations
- 2021Electrocatalytic Site Activity Enhancement via Orbital Overlap in A 2MnRuO 7(A = Dy 3+, Ho 3+, and Er 3+) Pyrochlore Nanostructurescitations
- 2020High Interfacial Hole‐Transfer Efficiency at GaFeO3 Thin Film Photoanodescitations
- 2020Pulsed laser deposition of single phase n- and p-type Cu2O thin films with low resistivitycitations
- 2020Promoting Active Electronic States in LaFeO3 Thin-Films Photocathodes via Alkaline-Earth Metal Substitutioncitations
- 2019Doping and alloying of kesteritescitations
- 2019Photovoltaic Performance of Phase-Pure Orthorhombic BiSI Thin-Filmscitations
- 2018Insights into the durability of Co-Fe spinel oxygen evolution electrocatalystscitations
- 2018Impact of Sb and Na Doping on the Surface Electronic Landscape of Cu2ZnSnS4 Thin Filmscitations
- 2018Investigating the Role of the Organic Cation in Formamidinium Lead Iodide Perovskite Using Ultrafast Spectroscopycitations
- 2018AMnO3 (A = Sr, La, Ca, Y) Perovskite Oxides as Oxygen Reduction Electrocatalystscitations
- 2017YFeO3 Photocathodes for Hydrogen Evolutioncitations
- 2017Textured PbI2 photocathodes obtained by gas phase anion replacementcitations
- 2017Single molecular precursor solution for CuIn(S,Se)2 thin films photovoltaic cellscitations
- 2017Solution Processed Single-Phase Cu2SnS3 filmscitations
- 2017Spectroscopic and electrical signatures of acceptor states in solution processed Cu2ZnSn(S,Se)4 solar cellscitations
- 2017Real-Time Tracking of Metal Nucleation via Local Perturbation of Hydration Layerscitations
- 2017YFeO 3 Photocathodes for Hydrogen Evolutioncitations
- 2016Cu2ZnSnS4 thin-films generated from a single solution based precursorcitations
- 2016Influence of thermal treatments on the stability of Pd nanoparticles supported on graphitised ordered mesoporous carbonscitations
- 2016A Synthetic Route for the Effective Preparation of Metal Alloy Nanoparticles and Their Use as Active Electrocatalystscitations
- 2015Crystal structure and defects visualization of Cu2ZnSnS4 nanoparticles employing transmission electron microscopy and electron diffractioncitations
- 2015Surface Activation of Pt Nanoparticles Synthesised by "Hot Injection" in the Presence of Oleylaminecitations
- 2015Growth of Epitaxial Pt<inf>1-x</inf>Pb<inf>x</inf> Alloys by Surface Limited Redox Replacement and Study of Their Adsorption Propertiescitations
- 2015Crystal structure and defects visualization of Cu 2 ZnSnS 4 nanoparticles employing transmission electron microscopy and electron diffractioncitations
- 2015Solution processed bismuth ferrite thin films for all-oxide solar photovoltaicscitations
- 2015Fast One-Pot Synthesis of MoS2/Crumpled Graphene p-n Nanonjunctions for Enhanced Photoelectrochemical Hydrogen Productioncitations
- 2015High surface area diamond-like carbon electrodes grown on vertically aligned carbon nanotubescitations
- 2013Electrochemical crystallization of spatially organized copper microwire arrays within biomineralized (dentine) templatescitations
- 2013Structure and Band Edge Energy of Highly Luminescent CdSei(1-x)Te(x) Alloyed Quantum Dotscitations
- 2012Electrocatalytic Properties of Strained Pd Nanoshells at Au Nanostructures: CO and HCOOH Oxidationcitations
- 2011Hydrogen Adsorption at Strained Pd Nanoshellscitations
- 2005Adsorption and photoreactivity of CdSe nanoparticles at liquid|liquid interfacescitations
- 2004Electrochemical and optical properties of two dimensional electrostatic assembly of Au nanocrystalscitations
- 2003Photoinduced electron transfer at liquid vertical bar liquid interfaces. Part VII. Correlation between self-organisation and structure of water-soluble photoactive speciescitations
Places of action
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article
Promoting Active Electronic States in LaFeO3 Thin-Films Photocathodes via Alkaline-Earth Metal Substitution
Abstract
The effects of alkaline-earth metal cation (AMC: Mg2+, Ca2+, Sr2+ and Ba2+) substitution on the photoelectrochemical properties of phase-pure LaFeO3 (LFO) thin-films are elucidated by X-ray Photoemission Spectroscopy (XPS), X-ray Diffraction (XRD), diffuse reflectance and electrochemical impedance spectroscopy (EIS). XRD confirms the formation of single-phase cubic LFO thin films, with a rather complex dependence on the nature of the AMC and extent of substitution. Interestingly, subtle trends in lattice constant variations observed in XRD are closely correlated with shifts in the binding energies of Fe 2p3/2 and O 1s orbitals associated with the perovskite lattice. We establish a scaling factor between these two photoemission peaks, unveiling key correlation between Fe oxidation state and Fe-O covalency. Diffuse reflectance shows that optical transitions are little affected by AMC substitution below 10%, which are dominated by a direct bandgap transition close to 2.72 eV. Differential capacitance data obtained from EIS confirm the p-type characteristic of pristine LFO thin-films, revealing the presence of sub-bandgap electronic state (A-states) close to the valence band edge. The density of A-states is decreased upon AMC substitution, while the overall capacitance increases (increase in dopant level) and the apparent flat-band potential shifts towards more positive potentials. This behaviour is consistent with the change in the valence band photoemission edge. In addition, capacitance data of cation-substituted films show the emergence of deeper states centred around 0.6 eV above the valence band edge (B-states). Photoelectrochemical responses towards the hydrogen evolution and oxygen reduction reactions in alkaline solutions show a complex dependence on alkaline-earth metal incorporation, reaching incident-photon-to-current conversion efficiency close to 20% in oxygen saturated solutions. We rationalise the photoresponses of the LFO films in terms of the effect sub-band gap states on majority carrier mobility, charge transfer and recombination kinetics.