A5027291670- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Advanced battery technologies research
- CO2 Reduction Techniques and Catalysts
- Catalytic Processes in Materials Science
- Advancements in Battery Materials
- Electrochemical sensors and biosensors
- Analytical Chemistry and Sensors
- Advanced Materials Characterization Techniques
- Advancements in Solid Oxide Fuel Cells
- Advanced Battery Materials and Technologies
- Graphene research and applications
- Spectroscopy and Quantum Chemical Studies
- Electrodeposition and Electroless Coatings
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Anodic Oxide Films and Nanostructures
- Advanced Memory and Neural Computing
- Innovative Teaching and Learning Methods
- Ammonia Synthesis and Nitrogen Reduction
- High Entropy Alloys Studies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
University of Bern
2016-2025
Society for Chemical Engineering and Biotechnology
2024
City Colleges of Chicago
2019
Harold Washington College
2019
University of Copenhagen
2013-2017
Argonne National Laboratory
2012-2015
Technical University of Munich
2007-2012
We report on the influence of glass corrosion establishing electrocatalytic activity fuel cell catalysts. A Teflon electrochemical was designed for measurements in alkaline electrolyte. The performance tested and compared to a standard by measuring oxygen reduction reaction hydrogen oxidation polycrystalline platinum KOH. It is demonstrated that shape cyclic voltammogram as well reactions are reproducible do not alter over long period time. By comparison, using made out Duran glass, it found...
Water and oxygen electrochemistry lies at the heart of interfacial processes controlling energy transformations in fuel cells, electrolyzers, batteries. Here, by comparing results for ORR obtained alkaline aqueous media to those ultradry organic electrolytes with known amounts H2O added intentionally, we propose a new rationale which water itself plays an important role determining reaction kinetics. This effect derives from formation HOad···H2O (aqueous solutions) LiO2···H2O (organic...
Hydrogen production from renewable resources and its reconversion into electricity are two important pillars toward a more sustainable energy use. The efficiency viability of these technologies heavily rely on active stable electrocatalysts. Basic research to develop superior electrocatalysts is commonly performed in conventional electrochemical setups such as rotating disk electrode (RDE) configuration or H-type cells. These experiments easy set up; however, there large gap real conversion...
Abstract In this study the oxygen reduction reaction (ORR) is investigated on a nanoparticulate silver electrocatalyst in alkaline solution. The catalytic activity of catalyst determined both terms mass as well specific and turn over frequency, respectively. It demonstrated that established activities are independent applied loading, an essential requirement for reasonable analysis. determination electrochemically active surface area (ECA) or number accessible sites ( N ECAS ), respectively,...
Abstract Based on H‐cell measurements, gold (Au) is one of the most selective catalysts for CO 2 reduction reaction (CO RR) to CO. To ensure a high dispersion, typically small Au nanoparticles (NPs) are used as catalyst. However, preparation NPs based conventional synthesis methods often requires use surfactants such polyvinylpyrrolidone (PVP). Here, systematic evaluation performance laser‐generated, surfactant‐free RR in gas diffusion electrode (GDE) setup was presented and results were...
We present a comprehensive comparison of the catalytic evaluation FeNC catalyst using two different approaches, i.e., employing rotating ring disk electrode (RRDE) technique and gas diffusion (GDE) setup. With both techniques, is evaluated in acidic as well alkaline environment. The oxygen reduction reaction (ORR) studied parameters such ORR kinetic activity, Tafel slope, apparent activation energy are determined at applied temperatures/overpotentials. obtained results offer clear evidence...
We present a detailed description of the construction and testing an electrochemical cell setup allowing investigation gas diffusion electrode containing carbon supported high surface area catalysts. The is designed for measurements in concentrated phosphoric acid at elevated temperature, i.e., very close to actual conditions temperature proton exchange membrane fuel cells (HT-PEMFCs). consists stainless steel flow field PEEK plastic body comprising cell, which exhibits three configuration....
The electrocatalytic oxidation of glucose to value-added chemicals, such as glucaric acid, has gathered increased interest in recent years. Glucose is a promising process which the potential contribute establishing renewable resources alternatives fossil carbon sources. Herein, we present rotating disk electrode (RDE) studies on polycrystalline gold surfaces and subsequent Koutecký-Levich analysis benchmark expand understanding reaction kinetics competition between glucose, intermediates OH−...
Abstract Within the Recycalyse project different research organization and industrial partners worked together to develop catalysts for oxygen evolution reaction proton exchange membrane electrolysis that reduce use of critical raw materials. The are applied polymer electrolyte membranes via a direct coating process tested both in single cells at stack level. In order dependence on material imports Europe long term, recycling is considered catalysts, electrodes entire system.
Abstract NiFe‐layered double hydroxides (LDHs) are promising electrocatalysts for the oxygen evolution reaction (OER) in alkaline media. Here, operando X‐ray diffraction (XRD) and total scattering used with Pair Distribution Function (PDF) analysis to investigate atomic structure of catalytically active material follow structural changes under operating conditions. XRD shows an interlayer contraction applied oxidative potential, which relates a transition from α‐LDH γ‐LDH phase. The phase is...
In our previous paper [ Journal of the Electrochemical Society , 155 P1 (2008) ] we reported on impact glass corrosion establishing electrocatalytic activity fuel cell catalysts. It was shown that leaching constituents into electrolyte is responsible for insufficiently reproducible measurements oxygen reduction reaction as well hydrogen oxidation polycrystalline platinum. present report elucidate which are leached through analysis alkaline electrolytes in contact with Duran by inductively...
Abstract Graphene is a promising candidate for an ideal membrane material. Its ultralow (one‐atomic) thickness potentially provides high permeation and at the same time selectivity. Here, it shown that these properties can be used to create confined, two‐dimensional electrochemical environment between graphene layer single‐crystal Pt(111) surface. The well‐defined fingerprint voltammetric characteristics of provide immediate information about penetration intercalation ions into confined...
In this work, we discuss the application of a gas diffusion electrode (GDE) setup for benchmarking electrocatalysts reductive conversion CO2 (CO2RR: reduction reaction). Applying silver nanowire (Ag-NW) based catalyst, it is demonstrated that in GDE conditions can be reached, which are relevant industrial to CO. This reaction part so-called 'Rheticus' process uses CO subsequent production butanol and hexanol on fermentation approach. contrast conventional half-cell measurements using liquid...
Abstract Gas diffusion electrode (GDE) setups have been recently introduced as a new experimental approach to test the performance of fuel cell catalysts under high mass transport conditions, while maintaining simplicity rotating disk (RDE) setups. In contrast RDE protocols, for investigations using GDE only few systematic studies performed. literature, different arrangements were demonstrated, example, with and without an incorporated proton exchange membrane. Herein, we chose membrane‐GDE...
Gas diffusion electrode (GDE) setups recently and increasingly received attention as testing platforms for fuel cell catalysts. GDE provide realistic reaction conditions while remaining simple efficient to use. Therefore, bridge the gap between rotating disk (RDE) measurements membrane assembly (MEA) testing. Here, we describe our initial design development its latest improvements that allow application of high temperatures. We point out experimental challenges overcame, yet also discuss...
We describe the development and test of an elevated pressure temperature rotating disk electrode (RDE) system that allows measurements under well-defined mass transport conditions. As demonstrated for oxygen reduction reaction on polycrystalline platinum (Pt) in 0.5M H2SO4, setup can easily be operated a range 1-101 bar oxygen, 140 °C. Under such conditions, diffusion limited current densities increase by almost two orders magnitude as compared to conventional RDE setups allowing, example,...
In this work, we have synthesized tetrahexahedral (THH) Pt nanoparticles (NPs) enclosed with {730} high-index facets using a one-step square wave potential procedure. The catalytic activity of the THH NPs toward oxygen reduction reaction (ORR) is studied under both transient and steady-state conditions. As benchmark, ORR compared those polycrystalline commercial Pt/C catalyst. results show that, conditions, performance are approximately same about 2 times lower than that Pt. However,...
Innovative PTE setup enhances laboratory benchmarking of next-generation catalysts for the oxygen evolution reaction under technologically relevant conditions.
The oxygen reduction reaction (ORR) is one of the key processes in electrocatalysis. In this communication, ORR studied using a rotating disk electrode (RDE). conventional work, method limits potential region where kinetic (mass transport free) rates can be determined to narrow range. Here, we applied new approach, which allows us analyze diffusion-limited high mass transport. Thus, for first time, effect anion adsorption on at such potentials.