A5076555361- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- Fuel Cells and Related Materials
- Carbon and Quantum Dots Applications
- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Microbial Fuel Cells and Bioremediation
- Advanced Nanomaterials in Catalysis
- Chemical Reactions and Isotopes
- Copper-based nanomaterials and applications
- Supercapacitor Materials and Fabrication
- Catalytic Processes in Materials Science
- ZnO doping and properties
- Medical Imaging Techniques and Applications
- Advancements in Battery Materials
- Graphene and Nanomaterials Applications
University of California, Santa Cruz
2015-2022
Graphene quantum dots (GQDs)-supported palladium nanoparticles were synthesized by thermolytic reduction of PdCl2 in 1,2-propanediol at 80 °C the presence GQDs and then subject to hydrothermal treatment an elevated temperature within range 140 200 °C. Transmission electron microscopic measurements showed a raspberry-like morphology for samples before after temperatures ≤160 °C, where ca. 8 nm diameter formed large aggregates 50 100 diameter, higher (180 °C), chain-like nanostructures...
Metal–nitrogen–carbon (MNC) nanocomposites have been hailed as promising and efficient electrocatalysts toward oxygen reduction reaction (ORR), due to the formation of MNx coordination moieties. However, MNC hybrids are mostly prepared by pyrolysis organic precursors along with select metal salts, where part sites inevitably buried in carbon matrix. This limited accessibility compromises electrocatalytic performance. Herein, we describe a wet-impregnation procedure facile thermal refluxing,...
Abstract Ruthenium has been hailed as a competitive alternative for platinum toward hydrogen evolution reaction (HER), critical process in electrochemical water splitting. In this study, we successfully prepare metallic Ru nanoparticles supported on carbon paper by utilizing novel magnetic induction heating (MIH) method. The samples are obtained within seconds, featuring Cl‐enriched surface that is unattainable via conventional thermal annealing. best sample the series shows remarkable HER...
Palladium nanoparticles supported on nitrogen-doped graphene quantum dots (NGQD) were synthesized by hydrothermal coreduction of palladium salts, citric acid, and urea at 160 °C for up to 12 h. Transmission electron microscopic studies showed that in the resulting PdNGQD nanocomposites, small clustered into superstructures 100 nm larger. X-ray photoelectron spectroscopic NGQDs contained only p-type pyridinic pyrrolic nitrogen centers, although total concentrations dopants rather consistent...
Rational design and engineering of high-efficiency electrocatalysts toward overall water splitting is crucial for the development hydrogen energy technology. Herein, a facile procedure described preparation effective bifunctional both evolution reaction (HER) oxygen (OER), where ruthenium nanoparticles are supported on graphene nanosheets that codoped with atomic cobalt nitrogen by controlled pyrolysis melamine-functionalized oxide metal ion precursors. The obtained nanocomposites (CoNG/Ru)...
Antibiotic resistance is an imminent threat to human health, requiring the development of effective alternate antibacterial agents. One such alternative includes nanoparticle (photo)catalysts that are good at producing reactive oxygen species (ROS). Herein, we report design and preparation nitrogen-doped carbon dots functionalized with atomically dispersed copper centers by Cu–N coordination (Cu/NCD) exhibit apparent activity toward Gram-negative Escherichia coli (E. coli) under...
Abstract Heteroatom‐doped carbon materials are promising electrocatalysts towards the oxygen reduction reaction (ORR). In this study, dual metals (Fe an Co) and nitrogen‐codoped porous cages (CHS−FeCo) were synthesized by controlled pyrolysis of silica nanoparticle‐supported melamine‐formaldehyde resin embedded with iron cobalt precursors, followed acid etching. Transmission electron microscopy measurements confirmed formation hollow cages, absence metal (oxide) nanoparticles suggested...
Platinum is atomically dispersed within P-doped C 3 N 4 forming Pt–N/P/Cl coordination interactions, and exhibits markedly enhanced electrocatalytic activity towards the hydrogen evolution reaction in acidic media, as compared to P-free counterpart.
Carbon-supported nanocomposites are attracting particular attention as high-performance, low-cost electrocatalysts for electrochemical water splitting. These mostly prepared by pyrolysis and hydrothermal procedures that time-consuming (from hours to days) typically difficult produce a nonequilibrium phase. Herein, the first time ever, we exploit magnetic induction heating-quenching ultrafast production of carbon-FeNi spinel oxide (within seconds), which exhibit an unprecedentedly high...
Electrochemical hydrogen generation is a rising prospect for future renewable energy storage and conversion. Platinum remains leading choice of catalyst, but because its high cost low natural abundance, it critical to optimize use. In the present study, platinum oxide nanoparticles approximately 2 nm in diameter are deposited on carbon nitride (C3N4) nanosheets by thermal refluxing C3N4 PtCl2 or PtCl4 water. These exhibit apparent electrocatalytic activity toward evolution reaction (HER)...
Oxygen reduction reaction (ORR) plays an important role in dictating the performance of various electrochemical energy technologies. As platinum nanoparticles have served as catalysts choice towards ORR, minimizing cost by diminishing nanoparticle size has become a critical route to advancing technological development. Herein, first-principle calculations show that carbon-supported Pt 9 clusters represent threshold domain size, and ORR activity can be significantly improved doping adjacent...
Electrocatalytic synthesis of hydrogen peroxide (H2O2) via two-electron reduction oxygen has emerged as an effective strategy to replace the traditional anthraquinone oxidation route. Herein, copper/carbon nanocomposites are prepared by pyrolytic treatment a metal organic framework precursor, which consists copper oxide (CuOx) nanoparticles dispersed within carbon matrix, evidenced results from transmission electron microscopy and X-ray photoelectron spectroscopy measurements. Deliberate...
Graphene derivatives have been attracting extensive interest as effective antimicrobial agents. In the present study, ternary nanocomposites are prepared based on graphene oxide quantum dots (GOQD), polyaniline (PANI), and manganese oxides. Because of hydrophilic GOQD PANI, resulting GPM readily dispersible in water upon photoirradiation at 365 nm exhibit activity toward both Gram-negative
Copper compounds have been extensively investigated for diverse applications. However, studies of cuprous hydroxide (CuOH) scarce due to structural metastability. Herein, a facile, wet-chemistry procedure is reported the preparation stable CuOH nanostructures via deliberate functionalization with select organic ligands, such as acetylene and mercapto derivatives. The resulting are found exhibit nanoribbon morphology consisting small nanocrystals embedded within largely amorphous...
Carbon-based nanocomposites have been attracting extensive attention as high-performance catalysts in alkaline media towards the electrochemical reduction of oxygen. Herein, polyacrylonitrile nanoflowers are synthesized via a free-radical polymerization route and used structural scaffold precursor, whereby controlled pyrolysis leads to ready preparation carbon (FeNi-NCF) doped with both metal (Fe Ni) nonmetal (N) elements. Transmission electron microscopy studies show that FeNi-NCF...
Carbon nanocomposites with Ru-doped Fe 2 O 3 nanoparticles are derived from a Fe–Ru–Fe trinuclear complex and zeolitic imidazolate framework 8 exhibit excellent electrocatalytic activity towards oxygen reduction reaction, comparable to that of Pt/C.