A5089967637- Ammonia Synthesis and Nitrogen Reduction
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Inorganic Chemistry and Materials
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Caching and Content Delivery
- Inorganic Fluorides and Related Compounds
- MXene and MAX Phase Materials
- Nanowire Synthesis and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and devices
University of North Texas
2022-2025
Dean College
2023
Significant interest in the electrocatalytic reduction of molecular nitrogen to ammonia (the reaction: NRR) has focused attention on transition metal carbides as possible electrocatalysts. However, a fundamental understanding carbide surface structure/NRR reactivity relationships is sparse. Herein, electrochemistry, DFT-based calculations, and situ photoemission studies demonstrate that NbC, deposited by magnetron sputter deposition, active for NRR at pH 3.2 but only after immersion an...
Nitrate ion is a common pollutant in surface and groundwater. Hence, its catalytic conversion into ammonia at ambient conditions by electrochemical photoelectrochemical pathways an attractive alternative to current production from the energy-intensive high-carbon-featuring Haber-Bosch process. As such, developing highly active product-selective catalysts with good durability cost-effectiveness desired. In this work, exfoliated MoS2-x reported as selective electrocatalyst photoelectrocatalyst...
To understand the competing HER and NRR reactions, their selectivities are compared for well-known catalysts, viz. , metal oxynitrides of high (vanadium) low (cobalt) oxophilicity as a function pH.
The production of ammonia for agricultural and energy demands has accelerated research more environmentally-friendly synthesis options, particularly the electrocatalytic reduction molecular nitrogen (nitrogen reaction, NRR). Catalyst activity NRR, selectivity NRR over competitive hydrogen evolution reaction (HER), are critical issues which fundamental knowledge remains scarce. Herein, we present results regarding sputter-deposited titanium nitride oxynitride films HER. Electrochemical,...
The electrochemical reduction of nitrate to ammonia is interest as an energy/environmentally friendly source for agriculture and energy applications a route toward groundwater purification. We report in situ photoemission data, results, density functional theory calculations that demonstrate vanadium oxide—prepared by ambient exposure V metal, with distribution surface 3+ 4+ oxidation states—specifically adsorbs reduces at pH 3.2 cathodic potentials. Negligible activity the absence NO 3 −...
Interactions of N2 at oxide surfaces are important for understanding electrocatalytic nitrogen reduction reaction (NRR) mechanisms. the polycrystalline vanadium oxide/vapor interface were monitored room temperature and total pressures up to 10-1 Torr using Near-Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS). The film was predominantly V(IV), with V(III) V(V) components. XPS spectra acquired in environments both pure equal H2O vapor. In N2, broad, partially resolved N1s features...
Abstract Single‐site molecular electrocatalysts, especially those that perform catalytic conversion of N 2 to NH 3 under mild conditions, are highly desirable derive fundamental structure‐activity relations and as potential alternatives the current energy‐consuming Haber‐Bosch ammonia production process. Combining theoretical calculations with experimental evidence, it has been shown easily reducible cobalt porphyrins catalyze six‐electron, six‐proton reduction dinitrogen at neutral pH...
Single-site electrocatalysts for dinitrogen reduction to ammonia have been developed based on easily reducible N-fused cobalt porphyrins. Faradic efficiencies in the 6–7.5% range with yield rates of 300–340 μmol g-1 h-1 at room temperature and neutral pH conditions accomplished. Nitrogen fixation under mild reaction was demonstrated. More information can be found Research Article by T. R. Cundari, M. Sankar, F. D'Souza, co-workers (DOI: 10.1002/chem.202402610).
Germanium exhibits superior hole and electron mobility compared with silicon, making it a promising candidate for replacement of silicon in certain future CMOS applications. In such applications, achieving atomically clean Ge surfaces the subsequent deposition ultrathin passivation barriers without interfacial reaction are critical. this study, we present situ x-ray photoelectron spectroscopy (XPS) investigations hydrocarbon removal from surface utilizing atomic oxygen at room temperature,...