| 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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Macfarlane, Douglas
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (33/33 displayed)
- 2023High performance acidic water electrooxidation catalysed by manganese–antimony oxides promoted by secondary metalscitations
- 2018Ionic liquid electrolytes supporting high energy density in sodium-ion batteries based on sodium vanadium phosphate compositescitations
- 2018The electrochemistry and performance of cobalt-based redox couples for thermoelectrochemical cellscitations
- 2018The effect of cation chemistry on physicochemical behaviour of superconcentrated NaFSI based ionic liquid electrolytes and the implications for Na battery performancecitations
- 2017Properties of High Na-Ion Content N-Propyl-N-Methylpyrrolidinium Bis(Fluorosulfonyl)Imide -Ethylene Carbonate Electrolytescitations
- 2017Preparation and characterization of gel polymer electrolytes using poly(ionic liquids) and high lithium salt concentration ionic liquidscitations
- 2017Metal-free black silicon for solar-powered hydrogen generationcitations
- 2016Novel Na+ ion diffusion mechanism in mixed organic-inorganic ionic liquid electrolyte leading to high Na+ transference number and stable, high rate electrochemical cycling of sodium cellscitations
- 2016Reduction of oxygen in a trialkoxy ammonium-based ionic liquid and the role of watercitations
- 2016Stable zinc cycling in novel alkoxy-ammonium based ionic liquid electrolytescitations
- 2016Inorganic-organic ionic liquid electrolytes enabling high energy-density metal electrodes for energy storagecitations
- 2016Unexpected effect of tetraglyme plasticizer on lithium ion dynamics in PAMPS based ionomerscitations
- 2016Investigating non-fluorinated anions for sodium battery electrolytes based on ionic liquidscitations
- 2016In-situ-activated N-doped mesoporous carbon from a protic salt and its performance in supercapacitorscitations
- 2016Enhanced thermal energy harvesting performance of a cobalt redox couple in ionic liquid-solvent mixturescitations
- 2016Recent developments in environment-friendly corrosion inhibitors for mild steel
- 2015Spin-crossover, mesomorphic and thermoelectrical properties of cobalt(II) complexes with alkylated N3-Schiff basescitations
- 2015Evaluation of electrochemical methods for determination of the seebeck coefficient of redox electrolytescitations
- 2015Characterisation of ion transport in sulfonate based ionomer systems containing lithium and quaternary ammonium cationscitations
- 2012Electrodeposited MnOx films from ionic liquid for electrocatalytic water oxidationcitations
- 2012Electrochemical etching of aluminium alloy in ionic liquids
- 2011Anodising AA5083 aluminium alloy using ionic liquids
- 2011Electrochemical reactivity of trihexyl(tetradecyl)phosphonium bis(2,4,4-trimethylpentyl)phosphinate ionic liquid on glassy carbon and AZ31 magnesium alloycitations
- 2011On the use of organic ionic plastic crystals in all solid-state lithium metal batteriescitations
- 2011Anodic oxidation of AZ31 Mg alloy in ionic liquid
- 2011Crystallisation kinetics of some archetypal ionic liquidscitations
- 2011Transport properties and phase behaviour in binary and ternary ionic liquid electrolyte systems of interest in lithium batteriescitations
- 2010Potentiostatic control of ionic liquid surface film formation on ZE41 magnesium alloycitations
- 2010Long-term structural and chemical stability of DNA in hydrated ionic liquidscitations
- 2010An azo-spiro mixed ionic liquid electrolyte for lithium metal- LiFePO 4 batteriescitations
- 2010Characterization of the magnesium alloy AZ31 surface in the ionic liquid trihexyl(tetradecyl)phosphonium bis(trifluoromethanesulfonyl)amide
- 2010Proton transport properties in Zwitterion blends with Bronsted acidscitations
- 2000Experimental and theoretical investigations of the effect of deprotonation on electronic spectra and reversible potentials of photovoltaic sensitizerscitations
Places of action
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article
Experimental and theoretical investigations of the effect of deprotonation on electronic spectra and reversible potentials of photovoltaic sensitizers
Abstract
<p>Deprotonation of the photovoltaic dye sensitizers cis-(H<sub>2</sub>-dcbpy)<sub>2</sub>RuX<sub>2</sub> (L<sub>2</sub>RuX<sub>2</sub>) (X= -CN<sup>-</sup>, -NCS<sup>-</sup>; H<sub>2</sub>-dcbpy = L = 2,2'-bipyridine-4,4'- dicarboxylic acid) can be achieved in dimethylformamide by reductive electrolysis at platinum electrodes at 20 °C, which allows the thermodynamic and spectral changes associated with deprotonation to be established. The overall reaction that occurs when a potential of -2.0 V vs Fc/Fc<sup>+</sup> (Fc = ferrocene) is applied to a platinum electrode can be summarized as (H<sub>2</sub>- dcbpy)<sub>2</sub>Ru(NCS)<sub>2</sub> + xe<sup>-</sup> → [(H<sub>2-</sub>(x)/<sub>2</sub>-dcbpy(x)/<sup>2-</sup>)<sub>2</sub>Ru(NCS)<sub>2</sub>](x)<sup>-</sup> + (x)/<sub>2</sub>H<sub>2</sub>, where x is always slightly less than 4. Thus, under certain experimental conditions, [(H-dcbpy<sup>-</sup>)<sub>2</sub>RuX<sub>2</sub>]<sup>2-</sup> is believed to be the major product formed by bulk electrolysis, where H-dcbpy<sup>-</sup> is the singly deprotonated H<sub>2</sub>-dcbpy ligand. The hydrogen gas formed in this electrochemically induced deprotonation can be generated heterogeneously at the electrode surface or via homogeneous redox reactions between ligand- reduced forms of L<sub>2</sub>RuX<sub>2</sub> and protons or water. Short time domains, reduced temperatures, and glassy carbon electrodes lead to detection of transiently stable ligand-reduced forms of L<sub>2</sub>RuX<sub>2</sub>. The reversible half-wave potentials for the ligand-based reduction of electrochemically generated deprotonated L<sub>2</sub>RuX<sub>2</sub> are 0.65 V more negative than their protonated counterparts. In contrast, deprotonation leads to the metal-based oxidation process being shifted by only about 0.3 V. Interestingly, protonated and deprotonated forms of L<sub>2</sub>RuX<sub>2</sub> do not coexist in a facile acid-base equilibrium state on the voltammetric time scale. Data obtained from electrogenerated deprotonated forms of the sensitizers are compared to those found for 'salts' used in photovoltaic cells which are prepared by reaction of L<sub>2</sub>RuX<sub>2</sub> with tetrabutylammonium hydroxide. Molecular orbital calculations were employed to provide theoretical insights into the effect of deprotonation on reversible potentials and electronic spectra, and results are in good agreement with experimentally obtained data. Electronic spectra, measured in situ during the course of reduction in a spectroelectrochemical cell, reveal that all bands shift to higher energies and that the absorbance decreases as deprotonation occurs. Implications of the importance of the findings related to reduction potentials and electronic spectra to the operation of photovoltaic cells that utilize deprotonated forms of sensitizers are considered.</p>