A5059738966- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Advanced Battery Materials and Technologies
- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Advancements in Solid Oxide Fuel Cells
- Advanced biosensing and bioanalysis techniques
- Analytical Chemistry and Sensors
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Electrochemical sensors and biosensors
- Nanocluster Synthesis and Applications
- Membrane Separation Technologies
- Biosensors and Analytical Detection
- Ionic liquids properties and applications
- Radioactive element chemistry and processing
- DNA and Nucleic Acid Chemistry
- Carbon and Quantum Dots Applications
- Water Quality Monitoring and Analysis
- Membrane Separation and Gas Transport
- Extraction and Separation Processes
- Inorganic and Organometallic Chemistry
Northeastern University
2015-2024
Universidad del Noreste
2005-2023
College of Medical Sciences
2015-2018
Shenyang University
2015-2018
Technical University of Denmark
2003-2013
Yantai University
1992-2003
Ludong University
1993-1996
The state-of-the-art of polymer electrolyte membrane fuel cell (PEMFC) technology is based on perfluorosulfonic acid (PFSA) membranes operating at a typical temperature 80 °C. Some the key issues and shortcomings PFSA-based PEMFC are briefly discussed. These include water management, CO poisoning, hydrogen, reformate methanol as fuels, cooling, heat recovery. As means to solve these shortcomings, high-temperature for operation above 100 °C under active development. This treatise devoted...
Abstract Proton exchange membrane fuel cell (PEMFC) technology based on perfluorosulfonic acid (PFSA) polymer membranes is briefly reviewed. The newest development in alternative electrolytes for operation above 100 °C summarized and discussed. As one of the successful approaches to high operational temperatures, evaluation doped polybenzimidazole (PBI) are reviewed, covering synthesis, casting, doping, physicochemical characterization testing. A temperature PEMFC system, at up 200...
The CO poisoning effect on carbon-supported platinum catalysts (at a loading of 0.5 mg per electrode) in polymer electrolyte membrane fuel cells (PEMFCs) has been investigated temperature range from 125 to 200°C with the phosphoric acid-doped polybenzimidazole membranes as electrolyte. is very temperature-dependent and can be sufficiently suppressed at elevated temperature. By defining tolerance voltage loss less than 10 mV, it evaluated that 3% hydrogen tolerated current densities up 200°C,...
Abstract Hexafluoropropylidene polybenzimidazole (F 6 PBI) was synthesized with excellent chemical stability and improved solubility. When doped phosphoric acid, however, the F PBI membranes showed plastic deformation at elevated temperatures. Further efforts were made to covalently crosslink chloromethyl polysulfone as a polymeric crosslinker. Comparing linear m membranes, polymer crosslinked exhibited little organo solubility, towards radical oxidation, high resistance swelling in...
High molecular weight polybenzimidazole (PBI) was synthesized and grafted with benzimidazole pendant groups. The high of PBI resulted in good film-forming properties superior tensile strength. With a phosphoric acid doping level (ADL) 13.1, strength 16 MPa achieved at room temperature. Grafting moieties onto the macromolecular chain introduced additional basic sites which allowed membrane to achieve higher uptakes. A molar conductivity, defined as specific conductivity each mole acid,...
Covalently cross-linked polymer membranes were fabricated from poly(aryl sulfone benzimidazole) (SO(2)PBI) and poly(vinylbenzyl chloride) (PVBCl) as electrolytes for high-temperature proton-exchange-membrane fuel cells. The cross-linking imparted organo insolubility chemical stability against radical attack to the otherwise flexible SO(2)PBI membranes. Steady phosphoric acid doping of was achieved at elevated temperatures with little swelling. acid-doped exhibited increased mechanical...
Abstract Polybenzimidazole (PBI) membranes were doped in phosphoric acid solutions of different concentrations at room temperature. The doping chemistry was studied using the Scatchard method. energy distribution complexation polymer is heterogeneous, that is, there are two types sites PBI for doping. protonation constants by found to be 12.7 L mol −1 (K 1 ) complexing with higher affinity, and 0.19 2 lower affinity. dissociation onto these 5.4 × 10 −4 3.6 −2 , respectively, about times...
Poly(aryl sulfone benzimidazole) (SO2PBI) and its copolymers with poly[2,2′-p-(phenylene)-5,5′-bibenzimidazole] (pPBI), termed as Co-SO2PBI, were synthesized varied feeding ratios of 4,4′-sulfonyldibenzoic acid (SDBA) to terephthalic (TPA). Incorporation the stiff para-phenylene flexible aryl linkages in macromolecular structures resulted high molecular weight good solubility. The chemical stability towards radical oxidation was improved for SO2PBI copolymer membranes due...