Commercialisation of proton exchange membrane fuel cell (PEMFC) technology depends on high volumetric power density and specific power for a given cost. In the present study, a novel wave-like architecture for PEMFC stack based on... more
Commercialisation of proton exchange membrane fuel cell (PEMFC) technology depends on high volumetric power density and specific power for a given cost. In the present study, a novel wave-like architecture for PEMFC stack based on undulate membrane electrode assembles (MEAs) and perforated bipolar plates (PBPs) was presented. Different from conventional plate-and-frame architecture, this design increased active area and achieved higher volumetric power density due to undulate MEAs. Moreover, perforated sheet metal was used as bipolar plates so that it could improve specific power.A single cell was designed and fabricated in house to evaluate the performance of the novel architecture stack. Stamped PBPs with open rate of 28.26% and hot pressed 5-layer undulate MEAs with Nafion® 112 were adopted. The results indicated that the peak volumetric power density and specific power are 2,715.94 W L–1 and 2,157.86 W kg–1, respectively, while they are 2,151.28 W L–1 and 1,709.22 W kg–1 at the output voltage of 0.6 V. This study may propose a possible means to meet the DOE's 2010 technical target that volumetric power density is 2,000 W L–1 and specific power is 2,000 W kg–1 for stack.
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Laser micro-adjustment is an application of laser forming for the adjustment of micro-, fiber- and electro-optical systems. Experience has shown that conventional material models cannot properly describe the micro-scale deformation... more
Laser micro-adjustment is an application of laser forming for the adjustment of micro-, fiber- and electro-optical systems. Experience has shown that conventional material models cannot properly describe the micro-scale deformation behavior due to size effects. As a result, traditional macro-scale laser forming is not suitable for the micro-scale laser forming process. In this study, the mechanical behavior of two-bridge actuators in laser micro-adjustment is investigated under the condition of geometrically scaled actuators. Numerical simulation is conducted by using a material model that takes into account the size effects. Simulation results obtained for cases with and without consideration of the size effects are compared, showing that size effects have a significant influence on the laser forming of micro-adjustment. The results with consideration of the size effects are found to agree well with the experimental data.
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Research Interests: Materials Engineering, Mechanical Engineering, Microstructure, Plasticity, Stress, and 16 moreMetal Forming, Finite element method, Finite Element, Numerical Simulation, Process Design, Dislocations, Forming, Scale Effect, Size Effect, Constitutive model, Stress distribution, Stress Distribution, Dimensions, Material Model, Constitutive Equation, and Mesoscale
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Research Interests: Engineering, Computational Fluid Dynamics, Manufacturing, Optimization, Proton Exchange Membrane Fuel Cells, and 15 moreSimulation, Computation Fluid Dynamics, Fabrication, Fluid flow, Parallel, CHEMICAL SCIENCES, Analytical Model, Three Dimensional, CFD simulation, Channel Flow, Proton Exchange Membrane Fuel Cell, Distributed Optimization, Low Pressure Boiler, Electrical Network, and Power Sources
Research Interests: Mechanical Engineering, Renewable Energy, Sensitivity Analysis, Comparative Study, Optimization, and 14 moreProton Exchange Membrane Fuel Cells, Linear Model, Porosity, Multi objective optimization, PEM fuel cell, Compression, Sensitivity, Roughness, Concept Design, Optimal Design, Channel Flow, Proton Exchange Membrane Fuel Cell, Electrical And Electronic Engineering, and Clamping
Research Interests: Engineering, Mechanical Engineering, Aerospace Engineering, Carbon, Performance, and 24 moreFuel Cell, Water Management, Proton Exchange Membrane Fuel Cells, Power, Cooling System, Current Density, Magnetron Sputtering, Feasibility, Thermal Conductivity, CHEMICAL SCIENCES, Concentration polarization, Thermal management, Contact Resistance, Oxygen Reduction Reaction, Surface Energy, Amorphous carbon, High Altitude, Proton Exchange Membrane Fuel Cell, Flow Rate, Pyrolytic Graphite (Pyrographite), Water Vapor, Power Sources, Stacking, and Power Density(Fuel Cell, Water Management, Proton Exchange Membrane Fuel Cells, Power, Cooling System, Current Density, Magnetron Sputtering, Feasibility, Thermal Conductivity, CHEMICAL SCIENCES, Concentration polarization, Thermal management, Contact Resistance, Oxygen Reduction Reaction, Surface Energy, Amorphous carbon, High Altitude, Proton Exchange Membrane Fuel Cell, Flow Rate, Pyrolytic Graphite (Pyrographite), Water Vapor, Power Sources, Stacking, and Power Density)
(Fuel Cell, Water Management, Proton Exchange Membrane Fuel Cells, Power, Cooling System, Current Density, Magnetron Sputtering, Feasibility, Thermal Conductivity, CHEMICAL SCIENCES, Concentration polarization, Thermal management, Contact Resistance, Oxygen Reduction Reaction, Surface Energy, Amorphous carbon, High Altitude, Proton Exchange Membrane Fuel Cell, Flow Rate, Pyrolytic Graphite (Pyrographite), Water Vapor, Power Sources, Stacking, and Power Density)