Global ETD Search
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Showing 1 to 15 of 15 for “"cathode catalyst"”.
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MANGANESE OXIDE AS A NEW CATHODE CATALYST IN MICROBIAL FUEL CELLS (MFCs)
… sieve (OMS-2) structure to replace platinum as a cathode catalyst in microbial fuel cells (MFCs). Undoped (ud-OSM-2) and three catalysts doped with cobalt (Co-OMS-2), copper (Cu-OMS-2), and cerium (Ce-OMS-2) to enhance their catalytic performances were investigated. The novel OMS-2 cathodes were …
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In-situ investigation and mitigation of carbon support corrosion of cathode catalyst in PEM fuel cells
… (CSC) is one of the key factors causing cathode electrocatalyst (Pt/C) degradation in proton exchange membrane fuel cells (PEMFC). It is electrochemical oxidation and thus needs to be investigated in-situ with potential imposed. CSC was characterized in-situ and correlated to the Pt redox …
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Transient Model of Heat,Mass,and Charge transfer as well as Electrochemistry in the Cathode Catalyst Layer of a PEMFC
A transient model of the cathode catalyst layer of a proton exchange membrane fuel cell is presented. The catalyst layer structure can be described as a superposition of the polymer membrane, the backing layer, and some additional platinum particles. The model, which incorporates some of the …
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Engineering Advanced Electrolyte and Metal Organic Framework Catalyst for Lithium Batteries
… of a high-entropy metal-organic framework (MOF) cathode catalyst to significantly change the discharge reaction pathway are the two main strategies used in this dissertation to overcome these significant obstacles. First, 1-methyl-3-propylimidazolium iodide (MPII) ionic liquid was added to a …
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Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells
Catalyst layer modeling can be a useful tool for fuel cell design. By comparing numerical results to experimental results, numerical models can provide a better understanding of the physical processes occurring within the fuel cell catalyst layer. This can lead to design optimization and cost …
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Probing the influence of relative humidity and temperature on the sulfonated silica ceramic carbon electrode for PEM fuel cell operation
… 80 ℃ to 95 °C. This indicates that the SS-CCE cathode catalyst layer promotes back diffusion of water generated at the cathode to the anode resulting in an increased performance with temperature and low relative humidity. Moreover, the SS-CCE catalyst showed better stability after an …
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Bioelectrochemical Systems: Microbiology, Catalysts, Processes and Applications
… microbiology of BES, develop cost-effective cathode catalysts, optimize the process engineering and identify the application niches. It has been shown in Chapter 2 that electrochemically active bacteria can take advantage of shuttle-mediated EET and create optimal anode salinities for their …
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Microscopic and spectroscopic characterization of fuel cell catalyst layer materials and interfaces
… the investigation of the role of defects at the catalyst layer/membrane interface, the degradation of alkaline fuel cell materials, and the investigation of catalyst ionomer distribution and catalyst ionomer interfaces within the catalyst layer. Chapter 3 investigates the properties of a series …
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Microscopic and spectroscopic characterization of fuel cell catalyst layer materials and interfaces
… the investigation of the role of defects at the catalyst layer/membrane interface, the degradation of alkaline fuel cell materials, and the investigation of catalyst ionomer distribution and catalyst ionomer interfaces within the catalyst layer. Chapter 3 investigates the properties of a series …
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Enhancement of Platinum Cathode Catalysis by Addition of Transition Metals
… of performance due to the degradation of the cathode catalyst under the harsh operating conditions in fuel cells. In the second part of my study, the performance, stability, and durability of four different Pt-based cathode catalysts were investigated in a microfluidic hydrogen-oxygen (H2/O2) …
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A Microscopic Continuum Model of a Proton Exchange Membrane Fuel Cell Electrode Catalyst Layer
… steady-state microscopic continuum models of the cathode catalyst layer (active layer) of a proton exchange membrane fuel cell are developed and presented. This model incorporates O₂ species and ion transport while taking a discrete look at the platinum particles within the active layer. The …
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Direct methanol fuel cell with extended reaction zone anode : PtRu and PtRuMo supported on fibrous carbon
… platinum. Further, methanol crosses over to the cathode, which decreases the fuel utilization and causes cathode catalyst poisoning. Another issue is the accumulation of the reaction product CO₂ (g) in the anode, which increases the Ohmic resistance and blocks reactant mass transfer pathways. A …
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Modifications and studies of the anode catalyst layer for the direct formic acid fuel cell
… of the effect of Nafion® loading in the anode catalyst layer using electrochemical techniques. Nafion®, within the anode and cathode catalyst layers, plays a large role in the performance of fuel cells. Nafion® also serves as a binder to help hold the catalyst nanoparticles onto the proton …
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NON-PLATINUM GROUP METAL OXGYEN REDUCTION CATALYSTS AND THEIR MECHANISM IN BOTH ACID AND ALKALINE MEDIA: THE EFFECT OF THE CATALYST PRECURSOR AND THE IONOMER ON OXYGEN REDUCTION
Non-platinum catalysts are an attractive strategy for lowering the cost of fuel cells, but much more development is needed in order to replace platinum, especially at the cathode where oxygen is reduced. Research groups worldwide have donated material for a study in which precursor structure to …