A5084777176- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advancements in Solid Oxide Fuel Cells
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Advanced Battery Materials and Technologies
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Analytical Chemistry and Sensors
- Concrete and Cement Materials Research
- Nanopore and Nanochannel Transport Studies
- Magnesium Oxide Properties and Applications
- Catalysis and Oxidation Reactions
- Membrane-based Ion Separation Techniques
- Electrochemical Analysis and Applications
- Corrosion Behavior and Inhibition
- Extraction and Separation Processes
- Sensor Technology and Measurement Systems
- Industrial Engineering and Technologies
- Catalysts for Methane Reforming
- Machine Learning in Materials Science
- Gas Sensing Nanomaterials and Sensors
University College London
2014-2023
Biochemical Society
2013-2022
London Centre for Nanotechnology
2015-2022
Transnational Press London
2017-2018
Engineering and Physical Sciences Research Council
2017
ECSI Fibrotools (United States)
2017
Harvard University
2015
LifeArc
2012
Lung-inspired flow fields are employed to overcome reactant homogeneity issues in PEFCs, resulting enhanced performance and minimal pressure drop.
This paper describes the use of an in situ analytical technique based on simultaneous displacement and resistance measurement gas diffusion layers (GDLs) used polymer electrolyte fuel cells (PEFCs), when exposed to varying compaction pressure. In terms losses within cells, ohmic loss makes up a significant portion. Of this loss, contact between GDL bipolar plate (BPP) is important constituent. By analysing change thickness GDLs under compression, mechanical electrical properties are...
Lung-inspired, fractal flow-fields hold great potential in improving the performance of polymer electrolyte membrane fuel cells (PEMFCs) by providing uniform gas distribution across electrodes and ensuring minimum entropy production whole system. However, inherent susceptibility to flooding renders their use inadequate at high humidity conditions. In-depth understanding water management lung-inspired is indispensable for implementation alternative outlet channel geometries or engineered...
Operando microbeam Raman spectroscopy is used to map the changes in hard carbon during sodiation and desodiation unprecedented detail, elucidating several important unresolved aspects of mechanism. On a substantial, reversible decrease G-peak energy observed, which corresponds directly sloping part voltage profile we argue can only be due steady intercalation sodium between turbostratic layers carbon. The corresponding reversibility D-peak change consistent with rather than representing...
Effective diagnostic techniques for Li-ion batteries are vital to ensure that they operate in the required voltage and temperature window prevent premature degradation failure. Ultrasonic analysis has been gaining significant attention as a low cost, fast, non-destructive, operando technique assessing state-of-charge state-of-health of batteries. Thus far, majority studies have focused on single C-rate at relatively charge discharge currents, such relationship between changing acoustic...
The current obstacles for all-vanadium redox flow batteries (VRFBs) include the sluggish reaction kinetics of electrode materials and overlapping potential range hydrogen evolution (HER) with negative couple. Bismuth (Bi) additives have exhibited tremendous enhancement battery performance; however, performance plateaus concentration Bi catalytic mechanism remains inconclusive controversial. Quantified kinetic values from three electrochemical methodologies, including modelling, show that...
Micro-tomography (CT) can be successfully employed to characterize ex situ the structural changes occurring in graphite felt electrodes during vanadium redox flow battery (VRFB) operation. Coupled high resolution X-ray and electron microscopy conjunction with XPS are used elucidate microstructural chemical voltage RFB carbon electrode. The results reveal onset of corrosion structure relatively early VRFB life-cycle, extended operation is expected result extensive evolution effects.
Different characterization techniques were used to analyse the chemically activated carbons in (i) one dimensional analysis including MIP and BET, (ii) two dimensions SEM TEM (iii) three X-ray CT. This structure has been directly linked electrochemical performance of supercapacitors for first time.
Activated carbons, with different surface chemistry and porous textures, were used to study the mechanism of electrochemical hydrogen oxygen evolution in supercapacitor devices. Cellulose precursor materials activated potassium hydroxide (KOH) ratios, behaviour was studied 6 M KOH electrolyte. In situ Raman spectra collected obtain structural changes carbons under severe oxidation reduction conditions, obtained data correlated cyclic voltammograms at high anodic cathodic potentials....
Porous metal foams have been used as alternative flow-fields in proton exchange membrane fuel cells (PEMFCs), exhibiting improved performance compared to conventional 'land and channel' designs. In the current work, mechanical behaviour of PEMFCs using foam is investigated across different length scales a combination electrochemical testing, X-ray computed tomography (CT), compression tests, finite element analysis (FEA) numerical modelling. Fuel cell peak power was seen improve by 42% when...
Water management and flooding play an important role in the performance durability of polymer electrolyte fuel cells (PEFCs). In this study, a dynamic electro-mechanical analysis is performed to examine working PEFC during hydration transients events. Cell resistance measured using electrochemical impedance spectroscopy (EIS), stress/strain characteristics – cell compression membrane electrode assembly (MEA) dimensional change are studied controlled unit (CCU). Ex-situ measurements thickness...
Some of the new liquid water management systems in polymer electrolyte membrane (PEM) fuel cells hold great potential providing flood-free performance and internal humidification. However, current entail major setbacks, which either inhibit implementation into state-of-the-art architectures, such as stamped metal flow-fields, or restrict their application to certain channel configurations. Here, a novel strategy is presented that uses capillary arrays control PEMFCs. These capillaries are...
Flow batteries represent a possible grid-scale energy storage solution, having many advantages such as scalability, separation of power and capabilities, simple operation. However, they can suffer from degradation during operation the characteristics felt electrodes are little understood in terms wetting, compression pressure drops. Presented here is design miniature flow cell that allows use x-ray computed tomography (CT) to study carbon materials situ operando, both lab-based synchrotron...