A5054713368- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Theoretical and Computational Physics
- Conducting polymers and applications
- Advanced battery technologies research
- Advancements in Solid Oxide Fuel Cells
- Advanced Battery Technologies Research
- Membrane-based Ion Separation Techniques
- Stochastic processes and statistical mechanics
- Quantum chaos and dynamical systems
- Electrochemical Analysis and Applications
- Quantum and electron transport phenomena
- Advanced Battery Materials and Technologies
- Physics of Superconductivity and Magnetism
- Quantum many-body systems
- Material Dynamics and Properties
- Heat transfer and supercritical fluids
- Advanced Memory and Neural Computing
- Biomedical Text Mining and Ontologies
- Random Matrices and Applications
- Spacecraft and Cryogenic Technologies
- AI in cancer detection
- Heat Transfer and Boiling Studies
- Metal Extraction and Bioleaching
- Analytical Chemistry and Sensors
Imperial College London
2014-2024
University College London
2016-2023
Evangelische Hochschule Ludwigsburg
2017
University of Connecticut
2004-2015
Clean Energy (United States)
2012-2015
Technische Universität Braunschweig
2011-2015
University of Central Florida
2009-2014
École Polytechnique Fédérale de Lausanne
1992-2012
Advanced Energy (United States)
2012
Charité - Universitätsmedizin Berlin
2004-2010
Carbon‐supported catalysts of Pt, Pt/Ru, Pt/Ru/W, and Pt/Ru/Pd were evaluated for the electro‐oxidation methanol in phosphoric acid at 180°C. These characterized using cyclic voltammetry x‐ray diffraction. Addition Ru to a 0.5 mg/cm2 Pt catalyst (1:1 atomic ratio) caused large reduction polarization. The open‐circuit voltage was reduced by 100 mV polarization 400 mA/cm2 180 mV. A Pt/Ru (5:2) with same content lowered 70 Additions W form Pt/Ru/W (1:1:1, Pd (2:2:1), all platinum loading, gave...
Nafion membrane degradation was studied in a polymer electrolyte fuel cell (PEMFC) under accelerated decay conditions. Fuel effluent water analyzed to determine the fluoride emission rate. Experimental findings show that formation of active oxygen species from decomposition or direct reduction reaction are not dominating mechanisms PEMFCs. Instead, occurs because molecular and react on surface Pt catalyst form membrane-degrading species. The source is reactant crossover through membrane....
An experimental program was conducted to determine the catalytic activity of high surface area platinum supported on carbon for electrochemical reduction oxygen in phosphoric acid. The Tafel slope at 160°C 96 weight per cent acid found be approximately 90 mV/decade. exchange current unit real same as that black or a flat sheet if effect electrode prepolarization is considered. Additional tests other temperatures indicated varies and similar sulfuric temperature. prediction double exists when...
Abstract Es werden die Verbrennungswärmen von Zr‐, Ti‐, Mo‐, Be‐ und Ta‐Metall ‐Nitrid, sowie Th‐Nitrid in der kalorimetrischen Bombe gemessen daraus Bildungswärmen Nitride berechnet.
The involvement of in the membrane degradation mechanism a polymer electrolyte fuel cell (PEMFC) was investigated. Measurement fluoride concentration effluent water used as an indicator rate. It found that is formed small concentrations but not main source harmful species, which degrade membrane. decomposition due to impurities or catalyst leading possible formation radical species would only account for fraction rate cell.
Nafion membrane degradation was studied in a polymer electrolyte fuel cell (PEMFC) under accelerated decay conditions. Fluoride emission rate (FER) determined by effluent water analysis used to quantify the degradation. Membrane is most likely caused either directly or indirectly species formed as result of and reaction on catalyst. To further understand mechanism, effects catalyst location, type, its interaction with , current density FER were investigated their implications underlying...
As a measure of catalytic activity, , the current density at 0.3 V overpotential, was chosen to evaluate oxygen reduction reaction (ORR) elevated temperatures and various relative humidities (RH) for polymer exchange membrane (PEM) fuel cells. The purely kinetic order ORR with respect partial pressure is less than 1.0 changes RH. activation energy 100% RH 50% active electrochemical surface area platinum little has strong effect on activity under dry conditions (0-60% RH), but wet its...
The authors prove that several one-dimensional wave equations for electrons, phonons and light propagation have all their states or proper modes exponentially localised when the medium is disordered. Vanishing of DC conductivity obtained models describing electronic motion. exact spectrum these also explicitly. Bounds on localisation length are exhibited in some cases.
The ability to determine the state of charge vanadium solutions is critical understanding reaction mechanisms and transport dynamics. This paper describes in detail methods used generate quantitative concentrations three four species an all-vanadium flow battery. UV-Vis method was shown provide concentration values that were more reliable than using either electrode voltage or integrated current with respect time. Furthermore, a proposed bring battery system into balance by independently...
The primary goal of this study is to examine if a convolutional neural network (CNN) can be applied as diagnostic tool for predicting Alzheimer's Disease (AD) from magnetic resonance imaging (MRI) using the MIRIAD-dataset (Minimal Interval Resonance Imaging in Disease) one single central slice brain. MIRIAD dataset contains patients' health records represented by set MRI scans brain and further data. Hyperparameters configurations CNNs were optimized determine best-performing model. CNN was...
Three gas-diffusion layers (GDL) with distinctively different gas permeability were used to study the influence of convection through GDL on cathode limiting current in proton exchange membrane (PEM) fuel cells. Several flow rates between 50 and 1000 cm3/min constant rate operation oxidant gases being air, 4% oxygen/nitrogen, 21% oxygen/helium. The was conducted at three cell temperature/relative humidity conditions: 80°C/75% inlet R.H., 100°C/70% 120°C/35% objective evaluate temperature,...
A step-by-step technique to evaluate six sources of polarization, mainly associated with the cathode, in hydrogen/air proton exchange membrane fuel cells is demonstrated. The polarization were nonelectrode ohmic overpotential, electrode concentration activation overpotential from Tafel slope, and catalyst activity. demonstrated as applied analysis curves an in-house assembly (MEA) using hydrogen/oxygen a diagnostic tool. results are discussed at three cell temperature/relative humidity...