Alkaline Electrolyte Fuel Cells

2013 ◽  
pp. 121-139 ◽  
Author(s):  
James Larminie ◽  
Andrew Dicks
Keyword(s):  
Fuel Cells ◽  
Alkaline Electrolyte

scholarly journals Increasing the efficiency Proton exchange membrane (PEMFC) & other fuel cells through multi graphene layers including polymer membrane electrolyte

2020 ◽  
Vol 8 (1) ◽  
pp. 95-107
Author(s):  
Azin Chitsazan ◽  
Majid Monajje
Keyword(s):  
Fuel Cells ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Alkaline Electrolyte ◽  
Membrane Thickness ◽  
Graphene Layers ◽  
Electrolyte Membranes ◽  
Polymer Membrane Electrolyte ◽  
Lower Temperature ◽  
Exchange Membrane

Multi layers Graphene has been simulated theoretically for hydrogen storage and oxygen diffusion at a single unit of fuel cell. Ion transport rate of DFAFC, PAFC, AFC, PEMFC, DMFC and SOFC fuel cells have been studied. AFC which uses an aqueous alkaline electrolyte is suitable for temperature below 90 degree and is appropriate for higher current applications, while PEMFC is suitable for lower temperature compared to others. Thermodynamic equations have been investigated for those fuel cells in viewpoint of voltage output data. Effects of operating data including temperature (T), pressure (P), proton exchange membrane water content (λ) , and proton exchange membrane thickness on the optimal performance of the irreversible fuel cells have been studied.Obviously, the efficiency of PEMFC extremely related to amount of the H2 concentration, water activities in catalyst substrates and polymer of electrolyte membranes, temperature, and such variables dependence in the direction of the fuel and air streams.

Carbon Quantum Dots Derived N-Doped Porous Carbon Frameworks with High Electrocatalytic for Oxygen Reduction Reaction

NANO ◽  
2017 ◽  
Vol 12 (08) ◽  
pp. 1750093 ◽  
Author(s):  
Xuelian Li ◽  
Xuming Xue ◽  
Yongsheng Fu
Keyword(s):  
Quantum Dots ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Carbon Quantum Dots ◽  
Reduction Reaction ◽  
Alkaline Electrolyte ◽  
Metal Free ◽  
Defect Sites

Developing low-cost, high-performance metal-free oxygen reduction reaction (ORR) catalysts for fuel cells is highly desirable but still full of challenges. In this study, nitrogen-doped three-dimensional (3D) porous carbon frameworks (NCFs) derived from zero-dimensional carbon quantum dots have been prepared by a simple one-step self-assembly technique. The resultant NCF-800 (carbonized at 800[Formula: see text]C) possesses unique 3D porous framework architecture, large specific surface area (171[Formula: see text]cm2 g[Formula: see text] and abundant defect sites. As a catalyst for ORR, the optimized NCF-800 displays a positive onset potential at 0.87[Formula: see text]V (versus reversible hydrogen electrode), which is roughly 60[Formula: see text]mV more negative than that of Pt/C (0.93[Formula: see text]V). Additionally, the NCF-800 exhibits long-term stability and strong endurance to methanol in alkaline electrolyte, which is much superior to those of Pt/C. Considering the outstanding activity of NCF-800, it can be worked as a prospective metal-free ORR catalyst for fuel cells in the future.

scholarly journals Modelling and Controlling of ion transport rate efficiency in Proton exchange membrane (PEMFC), alkaline (AFC), direct methanol (DMFC), phosphoric acid (PAFC), direct forming acid(DFAFC) and direct carbon (DCFC) fuel cells

2019 ◽  
Vol 9 (4) ◽  
pp. 4050-4059 ◽  
Keyword(s):  
Fuel Cells ◽  
Ion Transport ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Transport Rate ◽  
Alkaline Electrolyte ◽  
Membrane Thickness ◽  
Lower Temperature ◽  
Exchange Membrane ◽  
Power Curves

Ion transport rate of DFAFC, PAFC, AFC, PEMFC, DMFC and SOFC fuel cells have been studied. AFC which uses an aqueous alkaline electrolyte is suitable for temperature below 90 degree and is appropriate for higher current applications, while PEMFC is suitable for lower temperature compared to others. Thermodynamic equations have been investigated for those fuel cells in viewpoint of voltage output data. Effects of operating data including temperature (T), pressure (P), proton exchange membrane water content (λ) , and proton exchange membrane thickness ( on the optimal performance of the irreversible fuel cells have been studied. Performance of fuel cells was analyzed by simulating polarization and power curves for a fuel cell operating at various conditions with current densities.

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