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40 results for “hydrogen oxidation”
Supplementary Material: Putative novel hydrogen- and iron-oxidizing sheath-producing Zetaproteobacteria thrive at the Fåvne deep-sea hydrothermal vent field
<p>This repository contains four Supplementary Material files related to the manuscript "<strong>Putative novel hydrogen- and iron-oxidizing sheath-producing Zetaproteobacteria thrive at the Fåvne deep-sea hydrothermal vent field</strong>".</p> <p>1) SupplementaryMaterial1_TableS1.pdf</p> <p><strong>Supplementary Material 1.</strong> Sampling locations.</p> <p>2) SupplementaryMaterial2.pdf</p> <p><strong>Supplementary Material 2.</strong> Supplementary Data and Figures.</p> <p>3) SupplementaryMaterial3.xlsx</p> <p><strong>Supplementary Material 3.</strong> Supplementary Tables.</p> <p>Supplementary Table S1. Viral populations in Fåvne black smoker iron microbial mat.<br> Supplementary Table S2. MAGs present in the black smoker iron microbial mat.<br> Supplementary Table S3. Coverage of Zetaproteobacteria MAGs in Fåvne samples.<br> Supplementary Table S4. Zetaproteobacteria MAGs used in this study.<br> Supplementary Table S5. Predicted gene expression based on codon usage.<br> Supplementary Table S6. Hydrogenase Hya included in the hya phylogenetic tree.<br> Supplementary Table S7. Cyc2 included in the cyc2 phylogenetic tree.<br> Supplementary Table S8. Results of proteomics analysis.<br> Supplementary Table S9. Heavy metal resistance genes identified using BacMet database.<br> Supplementary Table S10. Sequencing statistics for MinION Nanopore sequencing.<br> Supplementary Table S11. Sequencing statistics for Illumina NovaSeq sequencing. <br> Supplementary Table S12. Assembly statistics for comparison, based on MetaQUAST. <br> Supplementary Table S13. List of single-copy marker genes used for concatenated phylogeny.<br> Supplementary Table S14. Selected genes for metabolism annotation.</p> <p>4) SupplementaryMaterial4.mp4</p> <p><strong>Supplementary Material 4.</strong> Sampling video of black smoker iron microbial mats at Fåvne hydrothermal vent (North Tower vent site).</p>
Participation of electrochemically inserted protons in the hydrogen evolution reaction on tungsten oxides
<p>Understanding the mechanisms by which electrodes undergo the hydrogen evolution reaction (HER) is<br>necessary to design better materials for aqueous energy storage and conversion. Here, we investigate<br>the HER mechanism on tungsten oxide electrodes, which are stable in acidic electrolytes and can<br>undergo proton-insertion coupled electron transfer concomitant with the HER. Electrochemical<br>characterization showed that anhydrous and hydrated tungsten oxides undergo changes in HER activity<br>coincident with changes in proton composition, with activity in the order HxWO3*H2O>HxWO3 ><br>HxWO3*2H2O. We used operando X-ray diffraction and density functional theory to understand the<br>structural and electronic changes in the materials at high states of proton insertion, when the oxides are<br>most active towards the HER. H0.69WO3*H2O and H0.65WO3 have similar proton composition, structural<br>symmetry, and electronic properties at the onset of the HER, yet exhibit different activity. We<br>hypothesize that the electrochemically inserted protons can diffuse in hydrogen bronzes and participate<br>in the HER. This would render the oxide volume, and not just the surface, as a proton and electron<br>reservoir at high overpotentials. HER activity is highest in HxWO3*H2O, which optimizes both the degree<br>of proton insertion and solid-state proton transport kinetics. Our results highlight the interplay between<br>the HER and proton insertion-coupled electron transfer on transition metal oxides, many of which are<br>non-blocking electrodes towards protons.</p>
Coexisting multi-states in catalytic hydrogen oxidation on rhodium - Supplementary Database 1
<p>Supplementary Database 1 to the associated article in Nature Communications (DOI: <a href="https://doi.org/10.1038/s41467-021-26855-y">10.1038/s41467-021-26855-y</a>) containing the raw data for the results shown in the display items. Experimental conditions, parameters and evaluation procedures are given in the corresponding figure captions and the Methods section of the associated article.</p>
Hydrogen-bonded xanthones as potential UV absorbers. The synthesis of xanthones from bio-renewable cardanol utilizing a ceric ammonium sulfate (CAS) mediated oxidation reaction
<p>The synthesis of hydrogen-bonded xanthones using the bio-renewable phenol, cardanol is described. Cardanol was initially converted into hydroxy-benzophenones. These benzophenones were converted into xanthones utilizing an oxidative ceric ammonium sulfate (CAS) mediated reaction. Subsequent ruthenium-mediated late-stage oxidation of the xanthones provided hydrogen-bonded xanthones, which displayed good UVA and UVB absorbing properties.</p>
Synthesis of 4-Quinolone N-Oxides via Controlled Partial Hydrogenation of 2-Nitrobenzoyl Enamines - NMR Data
<p>This archive contains raw 1H/13C FIDs and associated data in Bruker-specific format that can be viewed with Bruker’s TopSpin or other appropriate NMR processing software. The subfolders are named in accordance with the compound numbering in the associated research paper (Synthesis of 4-Quinolone N-Oxides via Controlled Partial Hydrogenation of 2-Nitrobenzoyl Enamines).</p> <p>Correspondence: angelov@uni-plovdiv.bg</p>
Reaction-Induced Metal-Metal Oxide Interactions in Pd In2O3/ZrO2 Catalysts Drive Selective and Stable CO2 Hydrogenation to Methanol
<p>Ternary Pd-In<sub>2</sub>O<sub>3</sub>/ZrO<sub>2</sub> systems hold promise as industrial catalysts for CO<sub>2</sub>-based methanol synthesis, but maximization of their productivity requires appropriate structuring of the active phase, promoter, and carrier. Here, we report that Pd-In<sub>2</sub>O<sub>3</sub>/ZrO<sub>2</sub> systems prepared by impregnation evolve into a unique catalyst architecture under CO<sub>2</sub> hydrogenation conditions, leading to selective and stable behavior. Detailed space and time-resolved <em>operando</em> characterization and simulations reveal that the restructuring process, completed within the first 30 min under reaction conditions, is governed by the energetics of metal-metal oxide interactions. The resulting architecture comprises InPd<em><sub>x</sub></em> alloy particles decorated by InO<em><sub>x</sub></em> layers, whose proximity is crucial to avoiding performance losses typically observed when palladium agglomerates. The findings highlight the potential beneficial role of reaction-induced restructuring in advancing catalyst design.</p>
Energy extraction from air: structural basis of atmospheric hydrogen oxidation
<p>MD simulation trajectories of HucSL dimer including wild-type and mutant proteins(E15A+I64A; I64A+L112A; E15A+I64A+L112A) in the presence of excess hydrogen and oxygen molecules. Preprint with details of the simulations and results can be found here: https://doi.org/10.1101/2022.10.09.511488.</p>
Dataset of paper "Solar photoelectrocatalytic oxidation of urea in water coupled to green hydrogen production"
<p>Dataset of paper "Solar photoelectrocatalytic oxidation of urea in water coupled to green hydrogen production"</p> <ul> <li>Material characterization for TiO<sub>2</sub> and WO<sub>3</sub> electrodes. </li> <li>Photoelectrochemical characterization for TiO<sub>2</sub> and WO<sub>3</sub>. </li> <li>One compartment cell characterization.</li> <li>Urea oxidation experiments for TiO<sub>2</sub> and WO<sub>3</sub> electrodes.</li> <li>Urea oxidation and products using one compartment cell.</li> <li>Production of NO<sub>2</sub><sup>-</sup> during urea oxidation.</li> <li>Evolution of NO<sub>3</sub><sup>−</sup> oxidation in time and conversion to NH<sub>4</sub><sup>+</sup>.</li> <li>Two compartment cell characterization.</li> <li>Urea oxidation and products using two-compartment cell.</li> </ul>
Cooperative O-atom binding produces the active configuration for OH formation in high-temperature catalytic hydrogen oxidation
Open the record for dataset details and reuse information.
Hierarchically Porous Reduced Graphene Oxide Coated with Metal-Organic Framework HKUST-1 for Enhanced Hydrogen Gas Affinity
<p>Metal organic frameworks (MOFs) are crystalline porous materials with interconnected pores and have been actively explored for various gas storage, separation and conversion applications due to their structural tunability. While the micropores (<2 nm) in MOFs are essential for increased gas affinity, these small pores significantly decrease the mass transport kinetics. One way to address this challenge is to develop hierarchically porous MOFs with interconnected micro-, meso- and macropores. Whereas these MOFs can be formed by using soft/hard templates or by creating pores through post-modification, it can also be achieved by growing MOFs on structural templates such as porous carbons i.e., reduced graphene oxide. The latter strategy can enable the introduction of hierarchical porosity, while creating a synergistic effect to simultaneously improve both mechanical property and gas affinity by creating pores at the interface. In this direction, we demonstrated that the coating of HKUST-1 onto a porous reduced graphene oxide (HRGO) led to the formation of a hierarchically porous structure, namely, HKUST-1@HRGO with increased affinity towards H2 gas. While the isosteric heats of adsorption (<em>Q</em><sub>st</sub>) values for H2 were found to be 7.7, 6.9 and 6.7 kJ mol<sup>-1</sup> for HRGO, HKUST-1 and the physical mixture of HKUST-1 and HRGO, respectively, at zero coverage, that of HKUST-1@HRGO composite revealed a significant increase up to 9.26 kJ mol<sup>-1 </sup>,<sup> </sup>thus clearly demonstrating not only the synergetic effect between HKUST-1 and the reduced graphene oxide and also the critical role interfacial pores as high affinity binding sites.</p> <p> </p>
Carbon and hydrogen isotope fractionation during uncultured aerobic oxidation of short-chain alkanes that discharged from a natural hydrothermal system
<p>Aerobic oxidation of short-chain alkanes was observed in gas samples from the Lutao intertidal hydrothermal vents in Taiwan, during storage without adding strains and replenishing substrates at 20 <sup>o</sup>C up to 29 months. The carbon isotope fractionation factors (<em>ε<sub>C</sub></em>) of methane (C<sub>1</sub>), ethane (C<sub>2</sub>), and propane (C<sub>3</sub>), were calculated using the Rayleigh fractionation equation to be -37.1 ± 7.5‰, -14.8 ± 4.8‰, and -4.7 ± 5.2‰, respectively. The hydrogen isotope fractionation factor (<em>ε<sub>H</sub></em>) of methane was determined to be -281 ± 187‰. DNA sequencing of the 16sRNA gene in the vent fluids suggests that aerobic oxidation is dominated by methanotrophs of the genera <em>Methylomicrobium</em> and <em>Methylophaga,</em> which use the ribulose monophosphate pathway (RuMP). The degrees of isotope fractionation (<em>ε<sub>C</sub></em> and <em>ε<sub>H</sub></em> values) herein are larger than previously reported values, possibly due to the limited O<sub>2</sub> supply and low abundance of aerobic methane-oxidizing bacteria in the experiments. Since the fractionation factor of methane is higher than those of ethane and propane, the aerobic oxidation of thermogenic or microbial alkanes could produce carbon isotope reversal, which is frequently noted as a trait of abiotic hydrocarbons. This work demonstrates that in addition to anaerobic microbial oxidation, aerobic oxidation with a low cell density can also produce significant isotope fractionation of alkanes in geological closed/semi-closed environments that are characterized by moderate temperatures and a limited supply of substrates and O<sub>2</sub>; these environments include cold seeps, mud volcanoes, and low-temperature hydrothermal aquifers/reservoirs.</p>
Data file for the paper "General Models for the Electrochemical Hydrogen Oxidation and Hydrogen Evolution Reactions – Theoretical Derivation and Experimental Results Under Near Mass-Transport Free Conditions", J. Phys Chem. C., 2016, DOI:10.1021/acs.jpcc.6b00011
<p>The data in this folder is supplementary information for the paper:<br /> Anthony Kucernak and Christopher Zalitis, "General Models for the Electrochemical Hydrogen Oxidation and Hydrogen Evolution Reactions – Theoretical Derivation and Experimental Results Under Near Mass-Transport Free Conditions", J. Phys Chem. C., 2016, DOI:10.1021/acs.jpcc.6b00011</p> <p>The information is © Anthony Kucernak</p> <p>A description of the models used in these files is provided in that paper. Below is a description of the files</p> <p>Experimental Data.xlsx - This file contains the experimental data used to produce figures 6 and 7 in the aforementioned paper<br /> Model.xlsx - This file contains verified versions of the Heyrovsky-Volmer, Tafel-Volmer and Heyrovsky-Tafel-Volmer mechanisms developed in the paper mentioned above. These excel spreadsheets may be used to fit experimental data user the Solver function in Excel.</p> <p>Heyrovsky-Tafel.cdf, Heyrovsky-Tafel-Volmer.cdf, Tafel-Volmer.cdf, Heyrovsky-Volmer.cdf - These are "computable document format" files produced using Wolfram Mathematica. They allow easy and quick modification of model parameters to allow real-time exploration of the effect of the parameters on current density (as linear and Tafel plots), hydrogen coverage, Effective Tafel slope, and derived parameters. The CDF viewer is availble to download from the Wolfram site - www.wolfram.com</p>
Activation of 2D cobalt hydroxide with 0D cobalt oxide decoration for microplastics degradation and hydrogen evolution
<p>See the paper:</p><p> </p><p>Greco, R.; Baxauli-Marin, L.; Temerov, F.; Daboczi, M.; Eslava, S.; Niu, Y.; Zakharov, A.; Zhang, M.; Li, T.; Cao, W. <i>Chem. Eng. J.</i> <strong>2023</strong>, 471, 1144569</p><p> </p><p>The authors acknowledge MAX IV Laboratory for time on Beamline [MAXPEEM] under Proposal [20210172]. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496.</p>
Data from paper: "Design principles for platinum nanoparticles catalysing the electrochemical hydrogen evolution and oxidation reactions: edges are much more active than facets"
<p>The data in this spreadsheet was used to produce the figures in the paper</p> <p>C M Zalitis, A. R. Kucernak, J. Sharman, and E. Wright, "Design principles for platinum nanoparticles catalysing the electrochemical hydrogen evolution and oxidation reactions: edges are much more active than facets"Journal of Materials Chemistry A, 2017, DOI:10.1039/c7ta05543a.</p> <p>Please cite the above reference if you wish to use this data</p>
Fig. 6 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 6. Longevity of AmSOD1 activity. Purified His-AmSOD1 was tested for its longevity both at room temperature and 4 ◦ C for different time period (20, 40, 60, 80, 100, 120 1st 140 days). The ratio enzyme activity was determined based on the activity of enzyme before incubation. Each data point represents the mean ± SD obtained from three independent reactions.
Fig. 7 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 7. Growth curves of the strains control and R-AmSOD1 in the medium without treatment and the medium containing containing (A) salt and (B) hydrogen peroxide. Each data point represents the mean ± SD obtained from three independent reactions.
Fig. 2 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 2. The effects of salt and hydrogen peroxide stress on the appearance pattern and activity of AmSOD1 in the leaves of A. marina (A) Appearance pattern of AmSOD1 and (B) AmSOD assay in the leaves responding to hydrogen peroxide and salt stress as well as control at various time points (0–48 h). Each histogram represents the mean obtained from three independent reactions (± SD). Different letters above the bars indicate statistically significant differences by LSD test.
Fig. 1 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 1. Phylogenetic tree of SOD sequences from different plants. For accession numbers and organisms, see ''Materials and Methods.''.
Fig. 4 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 4. Molecular mass of purified AmSOD1 using gel filtration. (A) Native molecular mass of recombinant AmSOD1 was measured with respect to standard protein marker as resolved in Biosil-250 analytical gel filtration column. Standard proteins used were: (a) 66.5 kDa-BSA fraction (b) 29 kDa-Carbonic anhydrase and (c) 16.7 kDa human myoglubin.
Fig. 3 in A highly efficient, thermo stable and broad pH adaptable copper-zinc super oxide dismutase (AmSOD1) mediates hydrogen peroxide tolerance in Avicennia marina
Fig. 3. SDS-PAGE analysis and the solubility of expressed His-AmSOD1 in the strain R-AmSOD1 harboring pET28a-AmSOD1 (A) Total soluble protein extracted from control strain and the strain R-AmSOD1 before and 1–4 h after induction with IPTG. (B) The study of solubility of His-AmSOD1 by comparison of His-AmSOD1 band intensities in the total protein (T), the soluble fraction extracted from R-AmSOD1 (S) and the unsoluble fraction (U) extracted from RAmSOD1 (The recombinant proteins were shown with arrows) (C) SDS-PAGE analysis of AmSOD1 after purification with affinity chromatography.
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