A5006008755- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Microwave-Assisted Synthesis and Applications
- Advanced materials and composites
- Advanced ceramic materials synthesis
- Electrochemical sensors and biosensors
- Advancements in Solid Oxide Fuel Cells
- Nonlinear Optical Materials Research
- Advanced Welding Techniques Analysis
- Metal Alloys Wear and Properties
- Dielectric properties of ceramics
- Multiferroics and related materials
- Thin-Film Transistor Technologies
- Energetic Materials and Combustion
- Electronic Packaging and Soldering Technologies
- Composite Material Mechanics
- Machine Learning in Materials Science
- Optical and Acousto-Optic Technologies
- Chalcogenide Semiconductor Thin Films
- Non-Destructive Testing Techniques
- Advanced battery technologies research
- Silicon and Solar Cell Technologies
Fraunhofer Institute for Solar Energy Systems
2020-2024
University of Delhi
2013-2023
Sanata Dharma University
2016-2023
Thapar Institute of Engineering & Technology
2016-2020
In this work we investigate the effect of platinum loading and layer thickness on cathode catalyst degradation by a comprehensive in situ STEM-EDS characterization. To decouple from each other, experiments were categorized two sets, with loadings varying between 0.1 0.4 mg Pt cm −2 : (i) Samples constant Pt/C ratio thus thickness, (ii) samples ratios, achieved dilution bare carbon, to maintain at different loadings. Every MEA was subjected an accelerated stress test, where cell operated for...
To advance the technology of polymer electrolyte membrane fuel cells, material development is at forefront research. This especially true for electrode assembly, where structuring its various layers has proven to be directly linked performance increase. In this study, we investigate influence ingredients in cathode catalyst layer, such as ionomer content, loading and type, on oxygen ion transport using a full parametric analysis. Using two types catalysts, 40 wt.% Pt/C 60 with high surface...
The solid state syntheses of cubic Zinc Telluride nanoparticles were successesfully achieved for the first time by microwave irradiation technique within ∼25 min as per author's knowledge. crystalline phase was confirmed powder X-ray diffraction. crystallite size calculated and found to be ∼40 nm. Scanning electron microscope also used determine shape nanoparticles, average particle ∼60 nm with spherical shapes. distribution in range ∼50 70 One transverse optic (TO) two longitudinal (1LO...
Abstract Dissimilar metal joints (DMJs) between ferritic stainless steel (FSS)-430 and low carbon (CS) are the prime requirements in several applications, such as storage vessels, chemical processing equipment, oil burner parts. Consequently, there is a high demand industry for development of an economic faster route DMJs FSS-430 CS. In present research work, CS have been carried out butt configuration by novel approach hybrid microwave heating (MH) with two additive metals, namely, Ni-based...
In this paper, joining of Hastelloy has been successfully carried out by microwave hybrid heating process. The joints were developed using a oven at frequency 2.45 GHz and 900 W. A thin layer slurry consisting nickel-based powder epoxy resin was introduced between the faying surfaces. obtained characterized XRD, SEM–EDS, Vicker's microhardness, tensile tests. Microstructure analysis revealed formation equiaxed grains, results XRD some intermetallics suppression carbide formation. This can be...
Abstract In this work, flatbed screen printing is evaluated regarding its capability to produce catalyst layers of PEM fuel cells. the field printed electronics, regarded as robust and high-throughput coating technology. The possibility in-plane structuring could be an additional degree freedom, enabling more complex designs in future. study, process parameters are varied investigate their effect on resulting layer thickness, homogeneity, Pt-loading. With usage different screens, Pt-loading...
In this study, the authors focused on preparation and characterization of Lead-free ferroelectric ceramics known as Sr 1−X Bi 2+2X/3 Nb 2 O 9 : SBBNX, where 0.0≤ × ≤0.4. The were synthesized using a conventional solid-state reaction route. researchers performed X-ray diffraction (XRD) analysis to confirm phase formation employed Rietveld refinement technique. results indicated that prepared SBBNX exhibited single with an orthorhombic structure, specifically belonging A2 1 am space group. All...
Abstract In this study, the enhancement of ZnO’s dielectric properties is pursued through manipulation its particle size using a surfactant-based approach. The synthesis ZnO nanoparticles with aid surfactants achieved sol–gel method. Through x-ray diffraction analysis, formation desired Wurtzite structure confirmed, no secondary phases detected. surface characteristics synthesized powders are examined scanning electron microscopy (SEM) and transmission (TEM), both which highlight even...
This paper presents the synthesis of iron oxide nanoparticles using atmospheric microplasma (AMP). The properties synthesized AMP are compared with particles (i) formed in as-prepared solution and (ii) prepared thermal decomposition method. Iron by all 3 treatment methods exhibit quite soft ferromagnetic coercivities less than 10 G. technique was found to be more efficient better method due ultra-shorter experiment time (around 2.5 min) as 90 min required for Moreover, isolated smaller size...
Nonstoichiometric strontium bismuth niobate (Sr0.8Bi2.2Nb2O9: SBN) ceramic was prepared using conventional solid-state reaction and microwave sintering methods. Complex impedance spectroscopy (CIS) has been used to investigate the intra intergranular contribution SBN ceramics as a function of temperature frequency. Cole‑Cole plots were interpret relaxation mechanism in which showed non-Debye relaxation. The grain boundary conductivity have estimated from plots. bulk (grain) resistance both...
Platinum on graphitized low surface area carbon (Pt/C) is coated with a silicon oxide thin film and employed as anode catalyst to manipulate the tolerance of proton exchange membrane fuel cells toward monoxide hydrogen sulfide contamination. The SiO 2 coating, prepared by successive hydrolysis 3‐aminopropyl‐triethoxisilane tetraethoxysilane, forms clusters in proximity Pt sizes comparable particles, leaving most surfaces free. performance without CO investigated situ at relative humidities...
ABSTRACT Current state‐of‐the‐art coating techniques for PEM fuel cell electrode manufacturing such as slot‐die use closed ink reservoirs, allowing low boiling point solvents the dispersion matrix solid components of catalyst ink. Applying inks to printing methods that expose air, like flatbed screen printing, results in an instable and nonscalable production process due successive evaporation these solvents. Within this study, a total 12 different are examined stability electrochemical...
In this work innovative additive printing methods for formation of polycrystalline silicon (poly-Si) and carbide (poly-SiC) layers local tunnel oxide passivating contacts (TOPCon) is evaluated. Replacement conventional vacuum processes vapor-phase deposition by Si in fabrication process high efficiency solar cells reduces processing complexity, and, hence manufacturing costs. Reliable inkjet- FlexTrail-printing are developed liquid-phase polysilane organic polysilazane inks that precursors...
The heat transfer coefficients (HTC) on the surface of a copper disk sample during quenching operation have been studied here. is made very small so that lumped mass approach can be applied for measurements. Lumped capacitance one technique, which advantageous due to its simplicity, but it an approximate technique determine HTCs, as this method assumes temperature part constant. change in HTC with orientation showed varied orientation. was also two surfaces facing towards each other distance...
During the heat treatment by quenching in a liquid medium convective transfer coefficient plays crucial role extraction of heat. The ultimately influences cooling rate and hence hardness mechanical properties. A Finite Element analysis simple flat copper sample with different orientation quenchant temperatures were carried out to check verify results obtained from experiments. (HTC) was calculated temperature history disc experimentally. This HTC data further used as input simulation...