Carbon monoxide (CO) oxidation is crucial in fuel cell anodes. Recent research has focused on ele... more Carbon monoxide (CO) oxidation is crucial in fuel cell anodes. Recent research has focused on electrocatalysts that synergistically enhance CO oxidation alongside alcohol/hydrogen oxidation. High sensitivity and selectivity for CO oxidation at lower onset potentials are the key objectives. Molybdenum (Mo) has emerged as a promising non‐noble transition metal co‐catalyst for CO oxidation. Mo versatility arises from its ability to alloy with Pt and mix with other non‐noble transition metals in various forms (MoOx, MoS2, MoC). Carbon‐supported Mo nanoparticles have shown potential in reducing Pt loading and improving CO tolerance due to Mo oxyphilic properties, effectively oxidizing weakly adsorbed CO and lowering onset and peak potentials. However, challenges persist, such as a limited potential window for CO oxidation and decreased CO adsorption affinity at higher potentials. Addressing these issues requires understanding factors affecting Mo‐based electrocatalysts (Mo‐ECs) activity,...
Easy wrap film has been widely used a single use film for dust free storage and COVID 19 preventi... more Easy wrap film has been widely used a single use film for dust free storage and COVID 19 prevention during the global pandemic. In the study, natural rubber (NR) latex was chosen as the domestic raw material for a coating application. Sulfur pre-vulcanized NR (PVNR) latex was prepared and purposely planned to be mixed with PVAc-co-PVA (Polyvinyl acetate-co-polyvinyl alcohol) or copolymer as the coating product for the proposed easy wrap film. Role of ratio between polymeric materials in physical, mechanical, thermal and weather resistant properties of the prepared films was elucidated. Ability of spark resistance of the easy wrap film prepared from the polymer mixtures prepared was tested.
A voltage decrease in the long‐term operation of hydrogen fuel cell (FC) electric cars under stea... more A voltage decrease in the long‐term operation of hydrogen fuel cell (FC) electric cars under steady settings under constant load and dynamic operating conditions is a performance constraint of concern. Although accelerated stress test (AST) procedures have been sought to diagnose degradation, the AST results of FC stacks have not been reported extensively. The purpose of this article is to discuss the generation of AST of FC stacks based on real load profiles and the consequences of load changes and start‐stop circumstances, which are mostly generated by common driven cycles in urban regions with high driving speeds and traffic jams. The highlight of this study is to analyze the effects of cycle repetition on the aging FC stack, especially the voltage degradation factor, degradation kinetics, and energy consumption. The relation between actual system temperatures in side cells assembled in the FC stacks and material degradation was also analyzed. The results presented high heat accu...
The commercial viability of fuel cells for vehicle application has been examined in the context o... more The commercial viability of fuel cells for vehicle application has been examined in the context of lightweight material options, as well as in combination with improvements in fuel cell powertrain. Investigation into ultra-lightweight bipolar plates (BPs), the main component in terms of the weight effect, is of great importance to enhance energy efficiency. This research aims to fabricate a layered carbon fiber/epoxy composite structure for BPs. Two types of carbon fillers (COOH-MWCNT and COOH-GNP) reinforced with woven carbon fiber sheets (WCFS) have been utilized. The conceptual idea is to reduce molding cycle time by improving the structural, electrical, and mechanical properties of BPs. Reducing the reactive molding cycle time is required for commercial production possibility. The desired crosslink density of 97%, observed at reactive molding time, was reduced by 83% at 140 °C processing temperature. The as-fabricated BPs demonstrate excellent electrical conductivity and mechani...
Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment
The term elastomer is a curtailment of two words, which are elastic and polymers. Accordingly, el... more The term elastomer is a curtailment of two words, which are elastic and polymers. Accordingly, elastomers are polymer materials with elasticity. The significant challenges hindering the development of materials for naval applications, similar to other engineering sectors, include achieving a competitive light elastomeric structure. Marine structures are susceptible to various damage responses due to various loads throughout their service life. Being flexible, elastomer has a low modulus of elasticity, exhibits higher values of failure strain and yield strength. In these regards, elastomers are attractive materials for applications that require elasticity because they offer substantial advantages compared to traditional materials. However, the low fire resistance of these elastomeric materials jeopardizes their use in some critical applications. As a result, elastomeric blends and composites containing flame retardant (FR) additives are commonly used. On the other hand, elastomers po...
2017 IEEE Vehicle Power and Propulsion Conference (VPPC), 2017
Proton exchange membrane fuel cells (PEMFCs) appear nowadays to be promising devices to face ener... more Proton exchange membrane fuel cells (PEMFCs) appear nowadays to be promising devices to face energy transition challenges in automotive applications. Nevertheless, the impact of the dynamic operations on their durability represents the main constraint for FC electric vehicles (FCEV) deployment. As a consequence, research and industry mainly focus on the ageing characterization of stack components, aiming at system lifetime prediction and enhancement. In this framework, to reduce test duration and costs, developing suited accelerated stress test (AST) procedures is the main challenge. To this purpose a new procedure able to accelerate the real ageing induced by driving cycle operations is investigated. In this paper the effects of load variations and start and stop conditions are presented. The aim of this work is to observe the lifetime dependence on load profile amplitude and frequency (dynamics) in order to deduce basic rules to develop ad-hoc AST procedures. The presented methodo...
An original equipment market (OEM) in Thailand mainly imports thermoplastic vulcanizates (TPV) fr... more An original equipment market (OEM) in Thailand mainly imports thermoplastic vulcanizates (TPV) from abroad that leads to a high manufacturing cost. To reduce the cost and to create value-added products from a plastic scrap, therefore, this research aim is to observe a possibility of using TPV and recycled polypropylene (rPP) blends as a raw material for OEM. The blends with various rPP loadings were successfully prepared through a traditional twin-screw extruder. Proportions between TPV and rPP were adjusted to determine the optimal flow and mechanical properties for productions of different auto parts. The blends were tested for studying rheology and mechanical properties: tensile; hardness; flexural; and creep behavior. All tests resulted in discussions about the feasibility of using TPV/rPP blends with respect to auto part specifications in real applications. Test results suggested that the TPV/rPP blends meet the requirements of specific automotive applications. Thermal property...
Carbon monoxide (CO) oxidation is crucial in fuel cell anodes. Recent research has focused on ele... more Carbon monoxide (CO) oxidation is crucial in fuel cell anodes. Recent research has focused on electrocatalysts that synergistically enhance CO oxidation alongside alcohol/hydrogen oxidation. High sensitivity and selectivity for CO oxidation at lower onset potentials are the key objectives. Molybdenum (Mo) has emerged as a promising non‐noble transition metal co‐catalyst for CO oxidation. Mo versatility arises from its ability to alloy with Pt and mix with other non‐noble transition metals in various forms (MoOx, MoS2, MoC). Carbon‐supported Mo nanoparticles have shown potential in reducing Pt loading and improving CO tolerance due to Mo oxyphilic properties, effectively oxidizing weakly adsorbed CO and lowering onset and peak potentials. However, challenges persist, such as a limited potential window for CO oxidation and decreased CO adsorption affinity at higher potentials. Addressing these issues requires understanding factors affecting Mo‐based electrocatalysts (Mo‐ECs) activity,...
Easy wrap film has been widely used a single use film for dust free storage and COVID 19 preventi... more Easy wrap film has been widely used a single use film for dust free storage and COVID 19 prevention during the global pandemic. In the study, natural rubber (NR) latex was chosen as the domestic raw material for a coating application. Sulfur pre-vulcanized NR (PVNR) latex was prepared and purposely planned to be mixed with PVAc-co-PVA (Polyvinyl acetate-co-polyvinyl alcohol) or copolymer as the coating product for the proposed easy wrap film. Role of ratio between polymeric materials in physical, mechanical, thermal and weather resistant properties of the prepared films was elucidated. Ability of spark resistance of the easy wrap film prepared from the polymer mixtures prepared was tested.
A voltage decrease in the long‐term operation of hydrogen fuel cell (FC) electric cars under stea... more A voltage decrease in the long‐term operation of hydrogen fuel cell (FC) electric cars under steady settings under constant load and dynamic operating conditions is a performance constraint of concern. Although accelerated stress test (AST) procedures have been sought to diagnose degradation, the AST results of FC stacks have not been reported extensively. The purpose of this article is to discuss the generation of AST of FC stacks based on real load profiles and the consequences of load changes and start‐stop circumstances, which are mostly generated by common driven cycles in urban regions with high driving speeds and traffic jams. The highlight of this study is to analyze the effects of cycle repetition on the aging FC stack, especially the voltage degradation factor, degradation kinetics, and energy consumption. The relation between actual system temperatures in side cells assembled in the FC stacks and material degradation was also analyzed. The results presented high heat accu...
The commercial viability of fuel cells for vehicle application has been examined in the context o... more The commercial viability of fuel cells for vehicle application has been examined in the context of lightweight material options, as well as in combination with improvements in fuel cell powertrain. Investigation into ultra-lightweight bipolar plates (BPs), the main component in terms of the weight effect, is of great importance to enhance energy efficiency. This research aims to fabricate a layered carbon fiber/epoxy composite structure for BPs. Two types of carbon fillers (COOH-MWCNT and COOH-GNP) reinforced with woven carbon fiber sheets (WCFS) have been utilized. The conceptual idea is to reduce molding cycle time by improving the structural, electrical, and mechanical properties of BPs. Reducing the reactive molding cycle time is required for commercial production possibility. The desired crosslink density of 97%, observed at reactive molding time, was reduced by 83% at 140 °C processing temperature. The as-fabricated BPs demonstrate excellent electrical conductivity and mechani...
Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment
The term elastomer is a curtailment of two words, which are elastic and polymers. Accordingly, el... more The term elastomer is a curtailment of two words, which are elastic and polymers. Accordingly, elastomers are polymer materials with elasticity. The significant challenges hindering the development of materials for naval applications, similar to other engineering sectors, include achieving a competitive light elastomeric structure. Marine structures are susceptible to various damage responses due to various loads throughout their service life. Being flexible, elastomer has a low modulus of elasticity, exhibits higher values of failure strain and yield strength. In these regards, elastomers are attractive materials for applications that require elasticity because they offer substantial advantages compared to traditional materials. However, the low fire resistance of these elastomeric materials jeopardizes their use in some critical applications. As a result, elastomeric blends and composites containing flame retardant (FR) additives are commonly used. On the other hand, elastomers po...
2017 IEEE Vehicle Power and Propulsion Conference (VPPC), 2017
Proton exchange membrane fuel cells (PEMFCs) appear nowadays to be promising devices to face ener... more Proton exchange membrane fuel cells (PEMFCs) appear nowadays to be promising devices to face energy transition challenges in automotive applications. Nevertheless, the impact of the dynamic operations on their durability represents the main constraint for FC electric vehicles (FCEV) deployment. As a consequence, research and industry mainly focus on the ageing characterization of stack components, aiming at system lifetime prediction and enhancement. In this framework, to reduce test duration and costs, developing suited accelerated stress test (AST) procedures is the main challenge. To this purpose a new procedure able to accelerate the real ageing induced by driving cycle operations is investigated. In this paper the effects of load variations and start and stop conditions are presented. The aim of this work is to observe the lifetime dependence on load profile amplitude and frequency (dynamics) in order to deduce basic rules to develop ad-hoc AST procedures. The presented methodo...
An original equipment market (OEM) in Thailand mainly imports thermoplastic vulcanizates (TPV) fr... more An original equipment market (OEM) in Thailand mainly imports thermoplastic vulcanizates (TPV) from abroad that leads to a high manufacturing cost. To reduce the cost and to create value-added products from a plastic scrap, therefore, this research aim is to observe a possibility of using TPV and recycled polypropylene (rPP) blends as a raw material for OEM. The blends with various rPP loadings were successfully prepared through a traditional twin-screw extruder. Proportions between TPV and rPP were adjusted to determine the optimal flow and mechanical properties for productions of different auto parts. The blends were tested for studying rheology and mechanical properties: tensile; hardness; flexural; and creep behavior. All tests resulted in discussions about the feasibility of using TPV/rPP blends with respect to auto part specifications in real applications. Test results suggested that the TPV/rPP blends meet the requirements of specific automotive applications. Thermal property...
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Papers by Rungsima Yeetsorn