Publications de Vasiliki Tileli

Interior Morphology and Pore Structure in High Surface Area Carbon Catalyst Supports

Vasiliki Tileli, Robin Pierre Alain Girod

In proton exchange membrane fuel cells, the interior porosity of the standard high surface area carbon (HSC) supports anchors and shields catalysts, offering benefits in performance and durability. Yet, these carbons also add mass transport resistance. Thi ...

WILEY-V C H VERLAG GMBH2025

On Tortuosity and Water Management in Hydrophobic and Hydrophilic Microporous Layers with Different Carbon Structures

Vasiliki Tileli, Michele Bozzetti

To improve mass transport limitations in proton exchange membrane fuel cells (PEMFCs), a detailed analysis of the gas diffusion layer structure can aid to understand the transport processes of oxygen to the catalyst layer and the liquid water removal mecha ...

ELECTROCHEMICAL SOC INC2025

Chemical Interactions at the Interface of Au on Bi2Se3 Topological Insulator

Vasiliki Tileli

This study explores the intricate chemical processes at the interface between the topological insulator Bi2Se3 and deposited Au. The study mainly focused on room-temperature interactions that can cause the aging of, e.g., gold contacts on electronic device ...

2024

Quasi-operando Transmission Electron Microscopy Diagnostics for Electrocatalytic Processes in Liquids

Vasiliki Tileli

It is of great interest to the energy community to understand how the mechano-physico-chemical phenomena that eventually lead to device degradation are related to the startup, operation, and shutdown phases. For electrocatalytic systems operating in liquid ...

Swiss Chemical Soc2024

Graphene Electrode for Studying CO2 Electroreduction Nanocatalysts under Realistic Conditions in Microcells

Vasiliki Tileli, Tzu-Hsien Shen

The ability to resolve the dynamic evolution of electrocatalytically induced processes with electrochemical liquid-phase electron microscopy (EM) is limited by the microcell configuration. Herein, a free-standing tri-layer graphene is integrated as a membr ...

Wiley-V C H Verlag Gmbh2024

Up-Scaled Preparation of Pt-Ni Aerogel Catalyst Layers for Polymer Electrolyte Fuel Cell Cathodes

Vasiliki Tileli, Michele Bozzetti

High activity and durability are two key requirements for the successful development of Pt-based ORR catalyst layers for polymer electrolyte fuel cell (PEFC) cathodes. Unsupported Pt-Ni aerogels consisting of an interconnected nanoparticle network have bee ...

2024

Catalyst Aggregate Size Effect on the Mass Transport Properties of Non-Noble Metal Catalyst Layers for PEMFC Cathodes

Vasiliki Tileli, Robin Pierre Alain Girod, Michele Bozzetti, Yen-Chun Chen, Secil Unsal

Non-noble metal catalysts (NNMCs) are regarded as a promising alternative to the costly Pt-based materials required to catalyze the oxygen reduction reaction (ORR) in proton exchange membrane fuel cell (PEMFC) cathodes. However, the large diversity of NNMC ...

ELECTROCHEMICAL SOC INC2023

Insights into Electrocatalyst Transformations Studied in Real Time with Electrochemical Liquid-Phase Transmission Electron Microscopy

Vasiliki Tileli, Tzu-Hsien Shen, Robin Pierre Alain Girod

The value of operando and in situ characterization methodologies for understanding electrochemical systems under operation can be inferred from the upsurge of studies that have reported mechanistic insights into electrocatalytic processes based on such mea ...

Amer Chemical Soc2023

Three-dimensional nanoimaging of fuel cell catalyst layers

Vasiliki Tileli, Robin Pierre Alain Girod, Timon Lazaridis

Catalyst layers in proton exchange membrane fuel cells consist of platinum-group-metal nanocatalysts supported on carbon aggregates, forming a porous structure through which an ionomer network percolates. The local structural character of these heterogeneo ...

NATURE PORTFOLIO2023

Elucidating the Mechanism of Fe Incorporation in In Situ Synthesized Co-Fe Oxygen-Evolving Nanocatalysts

Andreas Züttel, Vasiliki Tileli, Thi Ha My Pham, Tzu-Hsien Shen, Youngdon Ko, Liping Zhong

Ni- and Co-based catalysts with added Fe demonstrate promising activity in the oxygen evolution reaction (OER) during alkaline water electrolysis, with the presence of Fe in a certain quantity being crucial for their enhanced performance. The mode of incor ...

Amer Chemical Soc2023