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Kevin Sivula

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Publications associées (165)

Surface modification of semiconductor photoelectrodes

Kevin Sivula, Mathieu Steven Prévot, Nestor Guijarro Carratala

Photoelectrochemical (PEC) cells have emerged as promising devices that afford the direct conversion of solar energy into electric power and/or chemical fuels. Apart from the obvious importance of the bulk properties of semiconductor materials employed as ...

Royal Soc Chemistry2015

Toward Economically Feasible Direct Solar-to-Fuel Energy Conversion

Kevin Sivula

Amer Chemical Soc2015

Challenges towards Economic Fuel Generation from Renewable Ellectricity: The Heed for Efficient Electro-Catalysis

Kevin Sivula, Florian Le Formal, Wiktor Stefan Bourée, Mathieu Steven Prévot

Utilizing renewable sources of energy is very attractive to provide the growing population on earth in the future but demands the development of efficient storage to mitigate their intermittent nature. Chemical storage, with energy stored in the bonds of c ...

Swiss Chemical Soc2015

Multiflake Thin Film Electronic Devices of Solution Processed 2D MoS2

Kevin Sivula, Xiaoyun Yu, Mathieu Steven Prévot

Amer Chemical Soc2014

A novel approach for the preparation of textured CuO thin films from electrodeposited CuCl and CuBr

Kevin Sivula

We report on the electrodeposition of CuX (X = Cl, Br) thin films on fluorine-doped tin oxide (FTO) electrodes. The electrodeposited CuX thin films, for the first time, were used as intermediates to prepare CuO thin films. Calcination of the as-prepared Cu ...

Elsevier2014

A Bismuth Vanadate-Cuprous Oxide Tandem Cell for Overall Solar Water Splitting

Michael Graetzel, Kevin Sivula, Pauline Bornoz, Stanley David Tilley

Through examination of the optoelectronic and photoelectrochemical properties of BiVO4 and Cu2O photoelectrodes, we evaluate the feasibility of a BiVO4/Cu2O photoanode/photocathode tandem cell for overall unassisted solar water splitting. Using state-of-th ...

American Chemical Society2014

Hematite photoelectrodes for water splitting: evaluation of the role of film thickness by impedance spectroscopy

Michael Graetzel, Kevin Sivula, Florian Le Formal

The electrochemical behavior of alpha-Fe2O3 photoelectrodes prepared by spray pyrolysis with different thicknesses was examined under dark and illumination conditions. The main charge transport phenomena occurring in the PEC cell photoelectrodes were chara ...

Royal Soc Chemistry2014

Enhancing the Charge Separation in Nanocrystalline Cu2ZnSnS4 Photocathodes for Photoelectrochemical Application: The Role of Surface Modifications

Kevin Sivula, Mathieu Steven Prévot, Nestor Guijarro Carratala

Cu2ZnSnS4 (CZTS) colloidal inks were employed to prepare thin-film photocathodes that served as a model system to interrogate the effect of different surface treatments, viz. CdS, CdSe, and ZnSe buffer layers along with methylviologen (MV) adsorption, on t ...

Amer Chemical Soc2014

Controlling conjugated polymer morphology and charge carrier transport with a flexible-linker approach

Kevin Sivula, Andrea Gasperini, Sébastien Jacky Daniel Bivaud

The Stille-coupling polymerization of a short conjugated polymer with an aliphatic linker was used to demonstrate a prototype in a new class of polymer semiconductors wherein the conjugation segment length and the length of the entire chain can be independ ...

Royal Soc Chemistry2014

Defects Give New Life to an Old Material: Electronically Leaky Titania as a Photoanode Protection Layer

Kevin Sivula

Wiley-VCH Verlag2014

Photoelectrochemical Tandem Cells for Solar Water Splitting

Kevin Sivula, Mathieu Steven Prévot

In order to be economically competitive with simple "brute force" (i.e., PV + electrolyzer) strategies or the production of promising solar fuels, like H-2, from fossil fuels, a practical photoelectrochemical device must optimize cost, longevity, and perfo ...

American Chemical Society2013

Solar-to-Chemical Energy Conversion with Photoelectrochemical Tandem Cells

Kevin Sivula

Efficiently and inexpensively converting solar energy into chemical fuels is an important goal towards a sustainable energy economy. An integrated tandem cell approach could reasonably convert over 20% of the sun's energy directly into chemical fuels like ...

Swiss Chemical Soc2013

Effects of Molecular Weight on Microstructure and Carrier Transport in a Semicrystalline Poly(thieno)thiophene

Kevin Sivula, Andrea Gasperini

The ultimate control over chain self-assembly is key to unravel and optimize the relationship between film microstructure and charge carrier mobility in solution processable conjugated polymer semiconductors. Here we employ preparatory size exclusion chrom ...

American Chemical Society2013

Metal Oxide Photoelectrodes for Solar Fuel Production, Surface Traps, and Catalysis

Kevin Sivula

The photoelectrochemical reduction of water or CO2 is a promising route to sustainable solar fuels but hinges on the identification of a stable photoanode for water oxidation. Semiconductor oxides like Fe2O3 and BiVO4 have been gaining significant attentio ...

Amer Chemical Soc2013

Optimization and Stabilization of Electrodeposited Cu2ZnSnS4 Photocathodes for Solar Water Reduction

Kevin Sivula, Lorenzo Rovelli, Stanley David Tilley

Cu2ZnSnS4 (CZTS) is a promising p-type semiconductor that has not yet been extensively investigated for solar fuel production via water splitting. Here, we optimize and compare two different electrodeposition routes (simultaneous and sequential) for prepar ...

Amer Chemical Soc2013

The Transient Photocurrent and Photovoltage Behavior of a Hematite Photoanode under Working Conditions and the Influence of Surface Treatments

Michael Graetzel, Kevin Sivula, Florian Le Formal

Hematite (alpha-Fe2O3) is widely recognized as a promising candidate for the production of solar fuels via water splitting, but its intrinsic optoelectronic properties have limited its performance to date. In particular, the large electrochemical overpoten ...

American Chemical Society2012

A Ga2O3 underlayer as an isomorphic template for ultrathin hematite films toward efficient photoelectrochemical water splitting

Michael Graetzel, Maurin Cornuz, Kevin Sivula, Florian Le Formal, Jérémie Minh-Châu Brillet, Nicolas Tétreault, Takashi Hisatomi

Hematite photoanodes for photoelectrochemical (PEC) water splitting are often fabricated as extremely-thin films to minimize charge recombination because of the short diffusion lengths of photoexcited carriers. However, poor crystallinity caused by structu ...

2012

Dynamics of photogenerated holes in surface modified alpha-Fe2O3 photoanodes for solar water splitting

Michael Graetzel, Kevin Sivula, Takashi Hisatomi

This paper addresses the origin of the decrease in the external electrical bias required for water photoelectrolysis with hematite photoanodes, observed following surface treatments of such electrodes. We consider two alternative surface modifications: a c ...

National Academy of Sciences2012

TaOxNy Sputtered Photoanodes For Solar Water Splitting

Michael Graetzel, Rosendo Sanjines, Nicolas Xanthopoulos, Maurin Cornuz, Vincent Laporte, Kevin Sivula

A series of TaOxNy photoelectrodes were deposited on F:SnO2 (FTO) substrates by DC reactive sputtering at room temperature, under a mixture of Ar, N-2 and O-2. The effects of the O-2 partial pressure during deposition (Po-2) on the films crystallinity, the ...

Elsevier Science Bv2012

Highly efficient water splitting by a dual-absorber tandem cell

Michael Graetzel, Maurin Cornuz, Jun Ho Yum, Kevin Sivula, Jérémie Minh-Châu Brillet, Takashi Hisatomi

Photoelectrochemical water-splitting devices, which use solar energy to convert water into hydrogen and oxygen, have been investigated for decades. Multijunction designs are most efficient, as they can absorb enough solar energy and provide sufficient free ...

Nature Publishing Group2012

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