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Kevin Sivula

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Publications associées (165)

Photogenerated charge transfer in Dion-Jacobson type layered perovskite based on naphthalene diimide

Jacques-Edouard Moser, Jun Ho Yum, Kevin Sivula, Etienne Christophe Socie, Simon Nussbaum, George Cameron Fish

Incorporating organic semiconducting spacer cations into layered lead halide perovskite structures provides a powerful approach to mitigate the typical strong dielectric and quantum confinement effects by inducing charge-transfer between the organic and in ...

2023

Understanding and Mitigating the Degradation of Perovskite Solar Cells Based on a Nickel Oxide Hole Transport Material during Damp Heat Testing

Christophe Ballif, Mounir Driss Mensi, Jun Ho Yum, Kevin Sivula, Yongpeng Liu, Marion Solange Madeleine Dussouillez, Christian Michael Wolff

The development of stable materials, processable on alarge area,is a prerequisite for perovskite industrialization. Beyond the perovskiteabsorber itself, this should also guide the development of all otherlayers in the solar cell. In this regard, the use o ...

AMER CHEMICAL SOC2023

Efficient Cu2O Photocathodes for Aqueous Photoelectrochemical CO2 Reduction to Formate and Syngas

Michael Graetzel, Shaik Mohammed Zakeeruddin, Mounir Driss Mensi, Kevin Sivula, Linfeng Pan, Yongpeng Liu, Dan Ren, Jing Gao, Meng Xia, Jun Li

Photoelectrochemical carbon dioxide reduction (PEC-CO2R) represents a promising approach for producing renewable fuels and chemicals using solar energy. However, attaining even modest solar-to-fuel (STF) conversion efficiency often necessitates the use of ...

Amer Chemical Soc2023

Do You Really Mean to Call It Highly Efficient?

Kevin Sivula

AMER CHEMICAL SOC2023

Edge-Sharing Octahedrally Coordinated Ni-Fe Dual Active Sites on ZnFe2O4 for Photoelectrochemical Water Oxidation

Kevin Sivula

The structural properties of octahedral sites (B-Oh) in spinel oxides (AB(2)O(4)) play vital roles in the electrochemical performance of oxygen-related reactions. However, the precise manipulation of AB(2)O(4) remains challenging due to the complexity of t ...

WILEY2023

Transparent Porous Conductive Substrates for Gas-Phase Photoelectrochemical Hydrogen Production

Jun Ho Yum, Kevin Sivula, Linda Lazouni, Loï Charles Carbone, Benjamin Goldman, Rebekah Anne Wells, Simon Nussbaum, Marina Caroline Michèle Caretti, Elizaveta Potapova Mensi, Hannah Elizabeth Johnson, Emeline Cécile Rideau

Gas diffusion electrodes are essential components of common fuel and electrolysis cells but are typically made from graphitic carbon or metallic materials, which do not allow light transmittance and thus limit the development of gas-phase based photoelectr ...

Wiley-V C H Verlag Gmbh2023

Ink-Based CuIn0.3Ga0.7S2 Nanocrystal Thin Films as Photocathodes for Photoelectrochemical CO2 Reduction Reaction

Jun Ho Yum, Kevin Sivula, Nestor Guijarro Carratala

One of the promising methods to solve the current energyand environmentissues is photoelectrochemical (PEC) water splitting and CO2 reduction reaction. Chalcopyrite copper indium gallium sulfide (CIGS)and CuIn0.3Ga0.7S2 nanocrystal thinfilms have been cons ...

AMER CHEMICAL SOC2023

Photoelectrochemical CO2 Reduction at a Direct CuInGaS2/Electrolyte Junction

Michael Graetzel, Jun Ho Yum, Kevin Sivula, Nestor Guijarro Carratala, Yongpeng Liu, Simon Nussbaum, Dan Ren, Meng Xia

Photoelectrochemical (PEC) CO2 reduction has received considerable attention given the inherent sustainability and simplicity of directly converting solar energy into carbonbased chemical fuels. However, complex photocathode architectures with protecting l ...

AMER CHEMICAL SOC2023

Enabling Direct Photoelectrochemical H2 Production Using Alternative Oxidation Reactions on WO3

Kevin Sivula, Nukorn Plainpan

The efficient and inexpensive conversion of solar energy into chemical bonds, such as in H2 via the photoelectrochemical splitting of H2O, is a promising route to produce green industrial feedstocks and renewable fuels, which is a key goal of the NCCR Cata ...

SWISS CHEMICAL SOC2023

Assembling a Photoactive 2D Puzzle: From Bulk Powder to Large- Area Films of Semiconducting Transition-Metal Dichalcogenide Nanosheets

Kevin Sivula, Rebekah Anne Wells

CONSPECTUS: Two-dimensional (2D) semiconducting materials are poised to revolutionize ultrathin, high-performance optoelectronic devices. In particular, transition-metal dichalcogenides (TMDs) are well-suited for applications requiring robust and stable ma ...

2023

Covalent Organic Framework Nanoplates Enable Solution-Processed Crystalline Nanofilms for Photoelectrochemical Hydrogen Evolution

Michael Graetzel, Kevin Sivula, Yongpeng Liu, Meng Xia

As covalent organic frameworks (COFs) are coming of age, the lack of effective approaches to achieve crystalline and centimeter-scale-homogeneous COF films remains a significant bottleneck toward advancing the application of COFs in optoelectronic devices. ...

AMER CHEMICAL SOC2022

Transparency and Morphology Control of Cu2O Photocathodes via an in Situ Electroconversion

Michael Graetzel, Kevin Sivula, Linda Lazouni, Rebekah Anne Wells, Simon Nussbaum, Marina Caroline Michèle Caretti, Dan Ren, Meng Xia

2022

Effects of surface wettability on (001)-WO3 and (100)-WSe2: A spin-polarized DFT-MD study

Kevin Sivula, Rangsiman Ketkaew

An extensive understanding of WO3 and WSe2 bulk crystalline structures and explicit solvent effects on (001)-WO3 and (100)-WSe2 facets are essential for design of efficient (photo) electrocatalysts. The atomistic level understanding of both WO(3 )and WSe2 ...

ELSEVIER2022

Multiple Effects Induced by Mo6+ Doping in BiVO4 Photoanodes

Kevin Sivula, Ivan Grigioni, Nukorn Plainpan, Charles Roger Jean Lhermitte, Annalisa Polo

Mo6+ doping increases the photoelectrochemical performance of BiVO4 photoanodes in water oxidation. Herein, the underlying mechanisms is elucidated through a systematic structural, morphological, and photoelectrochemical investigation on photoelectrodes of ...

WILEY-V C H VERLAG GMBH2022

An Organic Semiconductor Photoelectrochemical Tandem Cell for Solar Water Splitting

Mounir Driss Mensi, Jun Ho Yum, Kevin Sivula, Han-Hee Cho, Dan Zhang

Photoelectrochemical cells employing organic semiconductors (OS) are promising for solar-to-fuel conversion via water splitting. However, despite encouraging advances with the half reactions, complete overall water splitting remains a challenge. Herein, a ...

WILEY-V C H VERLAG GMBH2022

Tuning Napththalenediimide Cations for Incorporation into Ruddlesden–Popper-Type Hybrid Perovskites

Jacques-Edouard Moser, Jun Ho Yum, Kevin Sivula, Etienne Christophe Socie, Liang Yao, Simon Nussbaum

Layered hybrid organic−inorganic perovskite (LHOIP) materials constructed with low-band-gap chromophore-based organic spacer cations are anemerging class of materials that promise unique tunability of their optoelectronic properties. However, the large siz ...

2022

Bulk Heterojunction Organic Semiconductor Photoanodes: Tuning Energy Levels to Optimize Electron Injection

Jun Ho Yum, Kevin Sivula, Nestor Guijarro Carratala, Arvindh Sekar, Liang Yao, Barbara Alexandra Primera Darwich, Yongpeng Liu, Han-Hee Cho, Juan Manuel Moreno Naranjo

The use of a bulk heterojunction of organic semiconductors to drive photoelectrochemical water splitting is an emerging trend; however, the optimum energy levels of the donor and acceptor have not been established for photoanode operation with respect to e ...

AMER CHEMICAL SOC2022

Derivative voltammetry: a simple tool to probe reaction selectivity in photoelectrochemical cells

Kevin Sivula, Nukorn Plainpan, Florent Alexandre Boudoire

We demonstrate the use of the derivative voltammogram method to predict the selectivity of the photo-driven oxidation of 5-hydroxymethylfurfural (HMF) on a WO3 photoanode as a function of applied potential using only information obtained from the linear sw ...

2022

High Performance Semiconducting Nanosheets via a Scalable Powder-Based Electrochemical Exfoliation Technique

Aleksandra Radenovic, Kevin Sivula, Miao Zhang, Victor Carle Adrien Boureau, Tzu-Heng Chen

The liquid-phase exfoliation of semiconducting transition metal dichalcogenide (TMD) powders into 2D nanosheets represents a promising route toward the scalable production of ultrathin high-performance optoelectronic devices. However, the harsh conditions ...

2022

Light-Responsive Oligothiophenes Incorporating Photochromic Torsional Switches

Kevin Sivula, Emilie Baudat, Muhammad Aiman Bin Rahmanudin Hamdan, Giuseppe Sforazzini, Augustina Jozeliunaite

We present a quaterthiophene and sexithiophene that can reversibly change their effective pi-conjugation length through photoexcitation. The reported compounds make use of light-responsive molecular actuators consisting of an azobenzene attached to a bithi ...

WILEY-V C H VERLAG GMBH2022

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