A5005830057- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Conducting polymers and applications
- Advancements in Solid Oxide Fuel Cells
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Vanadium and Halogenation Chemistry
- Electronic and Structural Properties of Oxides
- Catalysis and Oxidation Reactions
- Advancements in Battery Materials
- Advanced Battery Technologies Research
Hyundai Motors (South Korea)
2020
Illinois Institute of Technology
2011-2016
The stability of cardo-poly(etherketone) based anion exchange membranes was investigated by performing 1-D and 2-D HMQC NMR spectroscopy.
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.
Abstract Cardo‐poly(etherketone)‐based anion‐exchange membranes (AEMs) were prepared and employed as separators in a vanadium–cerium redox flow battery (V‐Ce RFB). V‐Ce RFBs with AEM yielded energy efficiencies (EEs) ranging from 67 to 84 % at current densities between 20 80 mA cm −2 . using Nafion 212 the separator had EEs 50 displayed capacity efficiency loss result of cation intermixing. Over charge/discharge cycles, RFB unchanged capacity, whereas was separator. There no substantial...
The synthesis, structural characterization, and performance evaluation of silsesquioxane - based sulfonated polyether ether ketone (SPEEK) composite membranes for direct methanol fuel cell (DMFC) applications are presented. 3-(trihydroxysilyl)-1-propanesulfonic acid (TPS) was used as a (SQO) precursor. Two batches SPEEK with ion exchange capacities (IEC) 1.06 ± 0.02 meq/g (denoted by SPEEK11) 1.34 0.05 SPEEK13) were prepared. SQO loadings in the ranged from 5 wt% to 30 wt%. ionic...
3-(trihydroxysilyl)-1-propanesulfonic acid (TPS) was used as a precursor to prepare SPEEK composite membranes (with added sulfonated silica). The ionic conductivity of (at 60oC in DI water) increased ~15 mS/cm after incorporation 15wt% TPS, and the methanol permeability slightly reduced (5-10%). Two batches with different ion exchange capacity (IEC) were prepared. SPEEK11 SPEEK13 have IEC 1.06{plus minus}0.02 mmolg-1 1.34{plus minus}0.05 mmolg-1, respectively. +5wt% TPS tested DMFC at using...
Cardo-polyethereketone (PEK-C) based anion exchange membrane (AEM) was prepared by quaternization using trimethylammonium. The structures of intermediates and AEMs were confirmed NMR spectroscopy. ion capacity the PEK-C 1.4±0.1 mmol g -1 , which resulted in membranes with an ionic conductivity (sulfate form, 30 o C) 5.6 ± 0.5 mS cm a vanadium (IV) permeability (at room temperature) 8.2±0.2 ×10 -9 2 s . Stability tests performed immersion 1.5M VO + oxidizing solution during two months no...
Novel silica aerogels functionalized with sulfonic acid were synthesized and employed in the preparation of composite membranes for DMFC applications. The additives had an ionic conductivity on order 100 mS/cm at 60oC 100% relative humidity. An enhancement was observed when using as inorganic fillers within SPEEK matrix to prepare membranes. addition 10 wt% sulfonated aerogel doubled membrane. methanol permeability higher that pristine although values measured additive still acceptable use
The vanadium redox flow battery (VRFB) is an electrochemical device suitable for large-scale energy storage due to its fast response time, long cycle life, and high efficiency 1 . In VRFBs, the electrodes provide sites facilitate reactions between V 3+ / 2+ 4+ 5+ ions 2 Graphite felt most common electrode material employed in VRFBs low cost, stability conductivity, reasonable surface area 3 Micro-tomograms of fresh graphite have already been obtained used extract detailed structural...
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