A5062731984- Analytical Chemistry and Sensors
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Advanced Chemical Sensor Technologies
- Gas Sensing Nanomaterials and Sensors
- Marine animal studies overview
- Water Quality Monitoring Technologies
- Underwater Vehicles and Communication Systems
- Electrocatalysts for Energy Conversion
- Membrane Separation and Gas Transport
- Microfluidic and Capillary Electrophoresis Applications
- Fuel Cells and Related Materials
University of Freiburg
2015-2021
Technical University of Munich
2014
The limited performance of platinum-based electrocatalysts for glucose electrooxidation is a major concern fuel cells, since characterized by slow reaction kinetics and low diffusion coefficient. Here, the presented graphene-supported hierarchical nanostructures attain highly enhanced electrocatalytic activity towards oxidation. Platinum nanoparticles electrodeposited on graphene support retain mechanical stability act as junctions allowing reliable, smooth dense growth platinum nanowires...
Determining local concentrations of the analytes in state-of-the-art microreactors is essential for development optimized and safe processes. However, selective, parallel monitoring all relevant reactants products a multianalyte environment challenging. Electrochemical microsensors can provide unique information on reaction kinetics overall performance hydrogen peroxide synthesis process microreactors, thanks to their high spatial temporal resolution ability measure situ, contrast other...
Stability of hierarchical micro- and nanostructured platinum electrodes for non-enzymatic glucose sensors were investigated taking into account the two major aspects stability. The first aspect, loss sensitivity due to poisoning by reaction products was significantly minimized using a potential-step protocol during chronoamperometric electrochemical impedance spectroscopy measurement, which led significant increase in sensor In second part modification electrode surface potential cycling...
We present an electrochemical microsensor system for the multiparametric detection of dissolved concentrations hydrogen peroxide (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O ) and oxygen (O inside a direct synthesis membrane microreactor. Both reactants are detected with high sensitivity on same Pt-based electrode by changing applied measurement potential in chronoamperometric protocol. The robust integration cell microreactor...
We present an electrochemical microsensor for the monitoring of hydrogen peroxide direct synthesis in a membrane microreactor environment by measuring and oxygen concentrations. In prior work, first time, we performed situ measurements with microsensors setup. However, sensors used were only able to measure at bottom microchannel. Therefore, limited assessment gas distribution concentration change over reaction channel dimensions was possible because dissolved gases entered reactor through...
We present an electrochemical sensor system for the detection of hydrogen peroxide inside a direct synthesis microreactor. The setup allows online, in situ measurement high reactant concentrations by amperometric across micro channel width and length. robust integration cell microreactor was demonstrated. Hydrogen detected under reaction conditions (pH 3–4, presence bromide) showing linear behaviour up to 2 mM with sensitivity excellent stability. range increased 10 applying diffusion...
Microstructured membrane reactors present a promising approach to master the productivity and safety challenges during direct synthesis of hydrogen peroxide. However, various mass transport processes occur in this complex system. In order gain deeper understanding these processes, saturation desaturation behaviour liquid reaction medium with gaseous reactants is investigated experimentally examine possible cross-contamination. Moreover, employed PDMS membrane's permeances oxygen are...