A5059593165- Gas Sensing Nanomaterials and Sensors
- Advancements in Solid Oxide Fuel Cells
- Advanced Chemical Sensor Technologies
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Analytical Chemistry and Sensors
- Advanced battery technologies research
- Multiferroics and related materials
- Magnetic and transport properties of perovskites and related materials
- Air Quality Monitoring and Forecasting
- ZnO doping and properties
- Ammonia Synthesis and Nitrogen Reduction
- Electronic and Structural Properties of Oxides
- Magnetic Properties and Synthesis of Ferrites
- Copper-based nanomaterials and applications
- Physics of Superconductivity and Magnetism
- Theoretical and Computational Physics
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Advanced Condensed Matter Physics
- Perovskite Materials and Applications
- Magneto-Optical Properties and Applications
- Caching and Content Delivery
University of New Mexico
2020-2024
Los Alamos National Laboratory
2016-2022
Pondicherry University
1999-2020
Los Alamos Medical Center
2020
University of Calgary
2012-2016
University of Birmingham
2015
National Chemical Laboratory
2007-2013
Karunya University
2011
Anna University, Chennai
2011
Bharathidasan University
2011
Fuel efficiency: Enhanced proton conductivity is obtained by the incorporation of single-walled carbon nanotubes prefunctionalized with sulfonic acid groups (S-SWCNTs) into a Nafion matrix (see scheme). The content CNT connects hydrophobic regions membrane, thus providing network for mobility. polymer electrolyte membranes also have improved mechanical stability in H2/O2 fuel cells. Supporting information this article available on WWW under...
The application of sulfonic acid-functionalized multiwalled (s-MWNT) carbon nanotubes to manipulate the hydrophilic domain size Nafion membranes is explored here as an option for tuning proton conductivity polymer electrolyte hydrogen-oxygen fuel cells. electrochemical impedance experiments provide preliminary evidence increased conductivity, while small-angle X-ray scattering measurements line out enhanced ionic cluster in these composite central reason higher (70 A optimum membrane vs 50...
Development of chemically stable proton conductors for solid oxide fuel cells (SOFCs) will solve several issues, including cost associated with expensive inter-connectors, and long-term durability. Best known Y-doped BaCeO3 (YBC) conductors-based SOFCs suffer from chemical stability under SOFC by-products CO2 H2O. Here, the first time, we report novel perovskite-type Ba0.5Sr0.5Ce0.6Zr0.2Gd0.1Y0.1O3-δ by substituting Sr Ba co-substituting Gd + Zr Ce in YBC that showed excellent (e.g., H2O)...
Development of thermally stable polymer electrolyte membranes with higher proton conductivity as well mechanical stability is a key challenge in commercializing PEM fuel cells operating above 100 °C. Polybenzimidazole are one the promising candidates this category although limited and moderate conductivity. Here incorporation functionalized MWCNT shown to increase both these parameters polybenzimidazole membranes. Further, formation domain like structure after phosphonated MWCNTs (P-MWCNTs)...
The ability of phosphonated carbon nanotubes to offer an unprecedented approach tune both proton conductivity and mechanical stability hybrid polymer electrolytes based on the polybenzimidazole membrane is demonstrated for fuel cell applications. covalent attachment between amino group 2-aminoethylphosphonic acid precursor CNTs has been confirmed by NMR IR experiments, while EDAX analysis indicates that one out every 20 atoms in CNT functionalized. Proton composite shows a remarkable 50%...
Gas sensors are widely used in environmental monitoring and provide controls especially when working with toxic gases. YSZ based λ -sensors have been utilized the automobile industry for exhaust gas more than 40 years. However, recent regulations on emissions reduction has forced further development of gases various applications. Mixed potential electrolyte receiving increased attention due to their higher sensitivity durability under harsh conditions. This review focuses (past 5 years)...
Efforts to create a sustainable hydrogen economy are gaining momentum as governments all over the world investing in production, storage, distribution, and delivery technologies develop infrastructure. This involves transporting gaseous or liquid form using carrier gases such methane, ammonia, mixtures of methane hydrogen. Hydrogen is colorless, odorless gas can easily leak into atmosphere leading economic loss safety concerns. Therefore, deployment robust low-cost sensors for various...
Emissions of CH 4 from natural gas infrastructure must urgently be addressed to mitigate its effect on global climate. With hundreds thousands miles pipeline in the US used transport gas, current methods surveying for leaks are inadequate. Mixed potential sensors a low cost, field deployable technology remote and continuous monitoring infrastructure. We demonstrate first time trial mixed sensor device coupled with machine learning internet-of-things platform at Colorado State University’s...
We demonstrate a facile construction of iron nitride-doped carbon nanofiber by effectively utilizing the existing slit pores and rough edges along inner wall substrate as originated virtue its cup-stack structure for increasing number active sites consequently oxygen reduction activity.
Ceria nanoparticles (NPs) have unique catalytic properties which make them suited to scavenge degrading radical species and their precursor peroxides during PEM fuel cell operation. However, in the acidic environment of cell, ceria dissolves resulting cations migrate within MEA, causing performance durability losses. In this work, ex situ testing was used evaluate peroxide decomposition, selectivity towards generation, solubility Gd, Pr, Zr-doped NPs over a range crystallite sizes dopant...
Mixed-potential electrochemical sensor arrays consisting of indium tin oxide (ITO), La 0.87 Sr 0.13 CrO 3 , Au, and Pt electrodes can detect the leaks from natural gas infrastructure. Algorithms are needed to correctly identify sources background anthropogenic such as wetlands or agriculture. We report for first time a comparison several machine learning methods mixture identification in context emissions monitoring by mixed potential arrays. Random Forest, Artificial Neural Network, Nearest...
Temperature-dependent, low-field (50 Oe) dc magnetic susceptibility (\ensuremath{\chi}) studies are reported for the randomly diluted fcc system ${\mathrm{Co}}_{\mathrm{p}}$${\mathrm{Mg}}_{1\mathrm{\ensuremath{-}}\mathrm{p}}$O. The studies, using powder samples, covered temperature range 1.6--300 K and composition 0.10\ensuremath{\le}p<1. Variations of N\'eel ${T}_{N}$, Curie-Weiss \ensuremath{\Theta}, Curie constant C, low-temperature magnetization M, lattice ${a}_{0}$ with p reported....
We here demonstrate a remarkable potential-dependent morphological evolution of platinum mesostructures in the form multipods, discs, and hexagons using porous anodic alumina membrane (PAAM). These structures prepared potentiostatically at -0.7, -0.5 -0.3 V, respectively, reveal unique shape-dependent electrocatalytic activity toward both formic acid ethanol oxidation reactions. A comparison electrooxidation kinetics these illustrates that show better performance whereas, for oxidation,...
In this paper, we report the chemical stability of a highly proton conducting Sm+Zr–codoped BaCe0.85-xZrxSm0.15O3-δ (BCZS) (0.01 < x 0.3) in H2O vapor and CO2, their electrical conductivity air, N2 + 3% H2O, H2 D2O. All prepared BCZS was found to be structurally stable against reaction with pure CO2 at 400°C for 24 h, showing positive role Zr providing stability. However, 600°C (0 0.2) showed formation BaCO3, while = 0.3 remained 20% N2. Upon exposure 90°C, Ba(OH)2.xH2O observed all...
Although nitrogen doped CNTs (N-CNTs) are considered as a promising alternative to platinized carbon for the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs), origin of enhanced ORR activity with N-CNTs is not clear at present. Among several plausible reasons, exposure edge plane and creation impurity band/surface states near Fermi level major causes behind catalytic activity. However, without doping known catalyze ORR. In this work, we study functionalized...
The continuous growth of modern industries has left the world with poor air quality especially in urban areas and work place environments, posing a major challenge to life. contributors traditional pollution are NOx, SOx, H2S while NH3 Volatile organic compounds increasing concern recently. Traditional monitors based on mass spec, infra-red spectroscopy gas chromatography expensive not suitable for large scale deployment. Electrochemical sensors provide cheap alternative option widespread...
Formation of platinum Y-junction nanostructures through templated electrodeposition using hierarchically designed alumina membranes is demonstrated for the first time. These unique reveal enhanced electrocatalytic activity toward both formic acid (up to 270%) and ethanol oxidation 180%), which are immense relevance fuel cell technology.