Person
Jan Vávra
This person is no longer with EPFL
Related publications (10)
Solution-based Cu+ transient species mediate the reconstruction of copper electrocatalysts for CO2 reduction
Raffaella Buonsanti, Anna Loiudice, Petru Pasquale Albertini, Jan Vávra, Gaétan Philippe Louis Ramona
Understanding metal surface reconstruction is of the utmost importance in electrocatalysis, as this phenomenon directly affects the nature of available active sites. However, its dynamic nature renders surface reconstruction notoriously difficult to study. ...
Berlin2024Monitoring and understanding Cu catalyst dissolution during CO2 electroreduction
Electrochemical reduction of carbon dioxide is a promising approach to decrease the amount of anthropogenic CO2 being released into the atmosphere, provided that a surplus of renewable electrical energy is available. Copper based materials are at the cente ...
EPFL2022The native oxide skin of liquid metal Ga nanoparticles prevents their rapid coalescence during electrocatalysis
Raffaella Buonsanti, Anna Loiudice, Dragos-Constantin Stoian, Jan Vávra, Valery Okatenko, Laia Castilla Amorós
Liquid metals (LMs) have been used in electrochemistry since the 19th century, but it is only recently that they have emerged as electrocatalysts with unique properties, such as inherent resistance to coke-poisoning, which derives from the dynamic nature o ...
2022Photoluminescence emission induced by localized states in halide-passivated colloidal two-dimensional WS2 nanoflakes
Raffaella Buonsanti, Anna Loiudice, Jan Vávra, Michele Saba
Engineering physicochemical properties of two-dimensional transition metal dichalcogenide (2D-TMD) materials by surface manipulation is essential to enabling their practical and large-scale application. This is especially challenging for colloidal 2D-TMDs ...
2021Oxygen Evolution Reaction in Ba0.5Sr0.5Co0.8Fe0.2O3-delta Aided by Intrinsic Co/Fe Spinel-Like Surface
Vasiliki Tileli, Thi Ha My Pham, Tzu-Hsien Shen, Jan Vávra
Among the perovskites used to catalyze the oxygen evolution reaction (OER), Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) exhibits excellent activity which is thought to be related to dynamic reconstruction at the flexible perovskite surface due to accommodation of ...
AMER CHEMICAL SOC2020Real-time Monitoring Reveals Dissolution/Redeposition Mechanism in Copper Nanocatalysts during the Initial Stages of the CO2 Reduction Reaction
Raffaella Buonsanti, Vasiliki Tileli, Dragos-Constantin Stoian, Tzu-Hsien Shen, Jan Vávra
Size, morphology, and surface sites of electrocatalysts have a major impact on their performance. Understanding how, when, and why these parameters change under operating conditions is of importance for designing stable, active, and selective catalysts. He ...
WILEY-V C H VERLAG GMBH2020Stability and Degradation Mechanisms of Copper-Based Catalysts for Electrochemical CO2 Reduction
Raffaella Buonsanti, Jan Vávra
To date, copper is the only monometallic catalyst that can electrochemically reduce CO2 into high value and energy-dense products, such as hydrocarbons and alcohols. In recent years, great efforts have been directed towards understanding how its nanoscale ...
2020Ligand-mediated formation of Cu/metal oxide hybrid nanocrystals with tunable number of interfaces
Raffaella Buonsanti, Seyedehbehnaz Varandili, Dragos-Constantin Stoian, Jan Vávra, James Richard Pankhurst
Combining domains of different chemical nature within the same hybrid material through the formation of heterojunctions provides the opportunity to exploit the properties of each individual component within the same nano-object; furthermore, new synergisti ...
2020Synthesis of Cu/CeO2-x Nanocrystalline Heterodimers with Interfacial Active Sites To Promote CO2 Electroreduction
Raffaella Buonsanti, Emad Oveisi, Mounir Driss Mensi, Seyedehbehnaz Varandili, Jan Vávra, Chethana Janardhana Gadiyar, Michal Stanislaw Strach, Jianfeng Huang, Gian Luca De Gregorio
Synergistic effects at metal/metal oxide interfaces often give rise to highly active and selective catalytic motifs. So far, such interactions have been rarely explored to enhance the selectivity in the electrochemical CO2 reduction reaction (CO2RR). Herei ...
AMER CHEMICAL SOC2019Nanocrystal/Metal–Organic Framework Hybrids as Electrocatalytic Platforms for CO2 Conversion
Raffaella Buonsanti, Mounir Driss Mensi, Pascal Alexander Schouwink, Jan Vávra, James Richard Pankhurst, Valeria Mantella, Yannick Thomas Guntern
The tunable chemistry linked to the organic/inorganic components in colloidal nanocrystals (NCs) and metal–organic frameworks (MOFs) offers a rich playground to advance the fundamental understanding of materials design for various applications. Herein, we ...
2019