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343 results for “Redox”
Chemical data accompanying the manuscript "Chromium cycling in redox-stratified basins challenges δ53Cr paleoredox proxy applications" in Geophysical research Letters
<p>Water column and sediment chromium concentration and stable isotope data and ancillary metal data from Lake Cadagno, Switzerland. These data accompany a manuscript by the same authors in Geophysical Research Letters (doi: 10.1029/2022GL099154).</p> <p> </p> <p>The associated CTD data are available in the following Zenodo dataset: Sepúlveda Steiner, O., Carlino, C., Haizmann, E., Roman, S., Wüest, A., & Bouffard, D. (2022). Lake Cadagno 2017 CTD and water quality monitoring [Data set]. Zenodo. <a href="http://doi.org/10.5281/zenodo.7127882">http://doi.org/10.5281/zenodo.7127882</a></p>
Seawater dissolved chromium concentration, redox speciation, and stable isotope composition in the North Pacific Ocean
<p>Dissolved seawater chromium concentrations, redox speciation, and stable isotope composition were measured on samples collected in the North Pacific Ocean. Samples were collected over diel cycles (2 for stations 1-5, 1 for station 6) on board the RV Kilo Moana cruise KM1713 from Seward Alaska to Honolulu Hawai’i. Sampling stations spanned the subarctic North Pacific (stations 1 & 2), the dynamic subarctic-subtropical convergence zone (stations 3 and 4) and the subtropical North Pacific (stations 5 and 6). Chromium was enriched from filtered samples by Mg(OH)<sub>2</sub> co-precipitation and analyzed by MC-ICP-MS using either isotope dilution (Cr redox speciation) or double spike methodology.</p>
Unveiling the potential of redox chemistry to form size tunable, high index silicon particles
<p>In the present work, the effect of changing the precursor ratio of silicon between sodium silicde and a hexacoordinated silicon complex to form various sizes of particles is studied. TEM images show the size difference between particles produced with different ratios. Particles produced with a 1:1 ratio are 45 nm in diameter and up to a 1:4 precursor ratio is used to make 230 nm particles. X-ray diffraction patterns confirm the presence of crystalline silicon for all sizes, while Raman spectroscopy shows how different degree of oxidation occurs thanks to different particle sizes, shifting the Raman peak. The surface chemistry is also studied to evidence the growth mechanism.</p>
Dataset for "Methodology for fast testing of carbon-based nanostructured 3D electrodes in vanadium redox flow battery"
<p>Here, we describe a technique for integrating carbon-based rod-like nanomaterials into a vanadium redox flow battery and a methodology for fast nanomaterial performance testing. The technique is based on creating a fixed nanomaterial bed sandwiched between two graphite felt electrodes, forming a 3D flow-through electrode in the battery. Performing various positive and negative control experiments, we show the beneficial effect of a nanostructured bed on the primary battery characteristics obtained from short-term electrochemical experiments. We then characterize carbon nanotubes exhibiting promising electrochemical behavior in vanadium electrolytes, as observed in our previous study. The load curves obtained from charge-discharge steps at various current densities and electrolyte flow rates revealed considerable differences in the performance of the tested materials, with few-walled carbon nanotubes reaching unsurpassable characteristics. Although developed for vanadium redox flow batteries, the method enables testing tube-like and rod-like (nano-)materials as electrodes for other flow battery systems. </p>
Redox-Active Organic Matter Measurements at the APEX fen in the Bonanza Creek Experimental Forest near Fairbanks, Alaska (2021-2022)
This dataset contains measurements collected for the publication "Direct and Indirect Effects of Water Table on Redox-Active Organic Matter Reduction in an Alaskan Rich Fen". This includes redox-active organic matter reduction measurements for three different experiments that took place at the APEX Fen; (1) common substrate in 2021, (2) common substrate in 2022, (3) peat collected from each water-table manipulation plot. Water-table levels are reported for experiments 1 and 2. Carbon greenhouse gas measurements and fluorescence and absorbance data are reported for experiment 2. Carbon greenhouse gas measurements are reported for experiment 3.
SALTEx soil oxidation-reduction (redox) potential measurements from the GCE LTER Seawater Addition Long-Term Experiment (SALTEx) between July 2016 and March 2017
SALTEx (Seawater Addition Long-Term Experiment) is a field experiment designed to simulate saltwater intrusion in a tidal freshwater wetland to predict how chronic (Press) and acute (Pulse) salinization will affect this and other tidal freshwater ecosystems. The SALTEx experiment was initiated in 2012 and consists of 31 field plots , each 2.5 m on a side. There are three treatments (Press, Pulse, and Fresh) and two types of controls (with and without sides), each consisting of six replicates. The Press treatment plots receive regular (4 times each week) additions of a mixture of seawater and fresh river water. Pulse plots receive the same mixture of seawater and river water during September and October, which is historically a time of low flow in the river when natural saltwater intrusion occurs. The Fresh treatment plots receive regular additions of fresh river water. Treatment water is added during low tide to facilitate its infiltration into the soil, and all plots are inundated by astronomical tides at high tide. Response measurements include porewater chemistry, specifically concentrations of chloride, sulfate, sulfide, dissolved organic carbon (DOC), ammonium-N, nitrate/nitrite-N, dissolved reactive phosphorus, total phosphorus, total nitrogen, organic nitrogen, carbon:nitrogen ratio, organic-carbon:organic-nitrogen ratio, and pH.
Synthesis, Structure and Redox Properties of Single-atom Bridged Diuranium Complexes Supported by Aryloxides
<p>This upload contains raw data (NMR, X-Ray Diffraction, Electrochemistry, SQUID and Elemental Analysis) files for the article</p>
Salt marsh redox potential at sites with runnel remediation in SE Massachusetts, 2020-2022
Natural disturbances, sea level rise, and historic human impacts to salt marshes have increased impounded water on marsh surfaces, resulting in vegetation loss and the associated loss of important ecosystem services such as carbon storage. Runnels are a climate adaptation technique designed to restore salt marsh habitat by reestablishing a tidal connection between impounded water and a nearby drainage feature. While runnels can drain impounded water and promote revegetation, the unintended effects of altering redox conditions remain unknown. Draining sediment and increasing redox potential could stimulate decomposition. We measured redox potential in two marshes in SE Massachusetts (Little Bay in Fairhaven, and Ocean View Farm in Dartmouth) prior to runnel restoration, and two years post restoration. We measured redox potential using three spatial distinctions: in the center of the panne, landward of the panne, and seaward of the panne. This was done every 2-3 weeks over a growing season.
Porewater nutrients, dissolved organics, redox species, and gasses in estuarine intertidal sediments at sites on Sapelo Island and near the Satilla River from Fall 2000 through Fall 2002
Seasonal patterns of estuarine creek-bank sediment porewater nutrients, dissolved organics, redox species and gasses were investigated at several sites on Sapelo Island and the Satilla River in coastal Georgia. Porewater ammonium, nitrate+nitrite, phosphate, silica, dissolved organic carbon, nitrogen and phosphorus, reduced iron and manganese, chloride, sulfate, hydrogen sulfide, pH, dissolved inorganic carbon, methane and nitrogen gas were measured at centimeter scale resolution depth profiles with the use of porewater equilibration meters. Several relatively pristine sites on Sapelo Island (Moses Hammock, Dean Creek and Marine Institute), a site slightly impacted by development (White Oak Creek) and a presumably heavily impacted site (Dover Bluff) show different levels and patterns of several porewater constituents.
SONAR -- experimental redox potentials for organic compounds undergoing 2-electron/2-proton transfer reactions
<p>reference data for the demo-compounds used as input for predicting redox potentials by a trained model </p><p>The file</p><ul><li>lists redox potentials and oxidized/reduced form for organic molecules undergoing a two-electron/two-proton reduction reaction (M + 2 e- + 2 H+ --> MH2)</li><li>contains data for 25 organic compounds compiled from various sources in literature</li><li>uses "|" as a separator</li><li>column names and explanations<ol><li><strong>ID</strong>: abbreviated trivial names e.g. for labelling</li><li><strong>orig redox potential [V]:</strong> original values reported in respective reference</li><li><strong>solvent</strong>: total formula, water (H2O) throughout</li><li><strong>pH</strong>: pH value of electrolyte solution. If not reported, inferred from the concentration of supporting electrolyte</li><li><strong>supporting_electrolyte</strong>: if spefified: total formula, if available; concentration</li><li><strong>SMILES_ox</strong>: molecular structures encoded as (manually assigned) SMILES strings for the oxidized species (M)</li><li><strong>SMILES_red</strong>: molecular structures encoded as (manually assigned) SMILES strings for the reduced species (MH2)</li><li><strong>ref_electrode:</strong> reference electrode the originally reported half cell potential refers to. If not specified, RHE was used as default</li><li><strong>redox potential vs SHE [V]</strong>:<ul><li>In case of missing information, reversible hydrogen electrode (RHE at pH = 0) was assumed, which corresponds to SHE</li><li>In case of conflicting entries (SHE and pH != 0), we assumed the pH should be accounted for and replaced "RHE" as reference electrode instead of "SHE". "NHE" was treated like "RHE".</li><li>In case the reference electrode was other than SHE, NHE or RHE, a respective offset was added. This was the case once for Ag/AgCl (assuming saturated solution, offset = 0.210, see respective reference)</li><li>Finally, the potential values were transferred to SHE according to: E(SHE) = E(RHE) + 0.05913 * pH</li><li>CAVEAT: Lacking information about individual pKa values, no other correction was made.</li></ul></li><li><strong>reference</strong>: orginal source</li></ol></li></ul>
Two-Electron Redox Reactivity of Thorium Supported by Redox-Active Tripodal Frameworks
<p>This upload contains raw data (NMR, X-Ray, UV, Electrochemistry and Elemental Analysis) files for the article</p>
SubductCR17_MAG-redox_and_CFP_diversity
<p>The code and data connected to the "Biology Meets Subduction" Metagenomic analysis of the 2017 Costa Rica project.</p>
Advanced Redox Electrochemical Capacitor Diode (CAPode) based on Parkerite (Ni3Bi2S2) with High Rectification Ratio for Iontronic Applications
<p>Recently, CAPodes were introduced as a new type of capacitive diode analogues. This device realizes unidirectional charging of ultracapacitors based on ion sieving mechanisms. Here, we present a new redox CAPode system in which hydroxide ions react with nickel bismuth sulfide on nickel foam as a battery-like electrode. This redox reaction leads to a high capacitance in a specific polarization window. However, for reversed bias this Faradaic electrode becomes inactive as it does not react with potassium cations, resulting efficient blocking. By adapting counter electrode materials, mass loading, utilized substrates, and electrolyte concentrations a very high rectification ratio (<em>R<sub>I</sub></em> = 37 and <em>R<sub>II</sub></em> = 0.96 at 10 mV s<sup>-1</sup>) was achieved, significantly surpassing the performance of other reported redox-type CAPodes. Moreover, this system shows an outstanding long-term stability of a rectification retention of 90% for <em>R<sub>II</sub></em> over 5000 repolarization cycles. Additionally, operando electrochemical measurements provide deep insights into the charge/discharge mechanism leading to a rationalization of the proposed concept. The integrated device, tested in logic gate circuits such as AND and OR gates, shows prospective results in ionologic applications.</p>
Redox paradox of vanadium in Tavorite LiVPO4F1-yOy : supplementary materials
<p>Vanadyl-type defects in vanadium oxy-fluoride phosphates confer interesting properties to these materials as positive electrodes in Li-ion or Na-ion batteries... <strong>List figures :</strong></p> <p><strong>2019-122-SM-FIGS1 :</strong> <strong>(a)</strong> Comparison of the SXRPD patterns obtained for the pristine LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> material <em>in situ</em>, in the electrochemical cell, (blue) and in a sealed capillary (black). The symbols mark peaks not belonging to the LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> phase (originating from lithium metal, beryllium, aluminum, PTFE, separator and Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> impurity). The grey areas represent the excluded 2θ regions for Rietveld refinement. <strong>(b)</strong> Comparison between voltage profiles obtained <em>in situ </em>in electrochemical cells during the XRD and XAS experiments and in coin cells. The small features seen at 3.7 and 4.1V originate from the Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> impurity.</p> <p><strong>2019-122-SM-FIGS2 :</strong> Rietveld refinement of (a) LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> and (b) Li<sub>0.45</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub>, the PTFE contribution is represented by *. For (b) two phases are required to fit the pattern: LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (91(1) w%, blue markers) and Li<sub>0.25</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (9(1) w% brown markers).</p> <p><strong>2019-122-SM-FIGS3 :</strong> Rietveld refinement of the last pattern obtained <em>operando</em> after Lithium deintercalation from LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (#126, corresponding to an overall composition of Li<sub>0.2</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub>): the refinement was performed considering a mixture of 3 phases, Li<sub>0.45</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (orange), Li<sub>0.25</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (brown) and VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (red), with their contributions being of 17(1), 58(1) and 25(1) wt.%, respectively. The peak highlighted by # corresponds to the LiV<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> impurity (<em>i.e.</em> delithiated form of Li<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>). For the refinement, the profile and the atomic position of the secondary phases (i.e. LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55 </sub>and VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub>) have been fixed based on their individual refinements (i.e. pattern #86 and <em>ex situ fully charged </em>pattern) whereas the cell parameters, profile and atomic positions of Li<sub>0.25</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55 </sub>have been refined independently.</p> <p><strong>2019-122-SM-FIGS4 : (a)</strong> SXRPD patterns obtained <em>operando</em> during lithium extraction from LiVPO<sub>4</sub>F<sub>0.25</sub>O<sub>0.75</sub>, <strong>(b)</strong> Selected SXRPD patterns at specific compositions.</p> <p><strong>2019-122-SM-FIGS5 : </strong>Evolution of the volume changes for each Li<sub>x</sub>VPO<sub>4</sub>F<sub>1-y</sub>O<sub>y</sub> sample as function of x during the first step of the charge (i.e. until Δx = y).</p> <p><strong>2019-122-SM-FIGS6 : (a)</strong> The evolution of the pre-edge intensity (obtained by integration of the signal from 5464 to 5474 eV) and the edge position (taken at half jump) upon cycling.<strong> (b)</strong> The variance plot justifying the use of three components.</p> <p><strong>2019-122-SM-FIGS7 : (a)</strong> V K-edge XANES spectra of several Tavorite-type references: LiV<sup>III</sup>PO<sub>4</sub>F (black line), LiV<sup>IV</sup>PO<sub>4</sub>O (grey line), V<sup>IV</sup>PO<sub>4</sub>F (orange line) and V<sup>V</sup>PO<sub>4</sub>O (red line) and LiVPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> (purple line). <strong>(b)</strong> The enlargement of the pre-edge region with the typical energy position of each pre-edge contributions (<em>i.e.</em> F-V<sup>3+</sup>O<sub>4</sub>-F, O=V<sup>4+</sup>O<sub>4</sub>—O and O=V<sup>5+</sup>O<sub>4</sub>—O)</p> <p><strong>2019-122-SM-FIGS8 : </strong>Magnitude of the Fourier transforms of the reconstructed components obtained by MCR-ALS (k-range: 2.7-12.7 Å<sup>-1</sup>, sine window). Li<sub>x</sub>VPO<sub>4</sub>F<sub>0.45</sub>O<sub>0.55</sub> with x = 1, 0.45 and 0 respectively for components #1, #2 and #3. The black lines represent the fit done in the R space (R range: 1.0 – 2.05 Å, dR = 0.1 Å, sine window).</p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p> <p> </p>
Advancing Vanadium Redox Flow Battery Analysis: A Deep Learning Framework for High-Throughput 3D Visualization and Bubble Quantification via Synchrotron X-ray Tomography
<p>Dataset and model of UTILE-Redox - Deep Learning based Tool for Autonomous 3D Bubble Analysis of Vanadium Flow Batteries from Synchrotron X-ray Imaging. This project focuses on the deep learning-based automatic analysis of Vanadium Redox Flow Batteries (VRFB) Synchrotron X-ray tomographies. This repository contains the Python implementation of the UTILE-Redox software for automatic volume analysis, feature extraction, and visualization of the results.</p>
Data for: "Carbon dioxide reduction by lanthanide(III) complexes supported by redox-active Schiff base ligands"
<p>RAW DATA FOR ARTICLE</p> <p>DATE: NOVEMBER 2022</p> <p>TITLE: Carbon dioxide reduction by lanthanide(III) complexes supported by redox-active Schiff base ligands</p> <p>AUTHORS: Nadir Jori, Davide Toniolo, Bang C. Huynh, Rosario Scopelliti, and Marinella Mazzanti*</p> <p>JOURNAL: Inorganic Chemistry Frontiers (RSC) 2020</p> <p>DOI: <a href="https://doi.org/10.1039/D0QI00801J">10.1039/D0QI00801J</a> </p> <p> </p>
Soil redox potential vs. soil microbial activity and structure
<p>The dataset was collected as a part of the Carbon Action field experiment in 2021. The experiment had 100 farms testing carbon farming practices 2019-2023. These samples were from a subset of 20 farms, which were routinely sampled every year.</p> <p>I measured the following parameters</p> <ul> <li>redox potential Eh, with an ORP meter + electrode reference voltage at 50% pore filled moisture</li> <li> pH in distilled water 10:1 water:soil mixture</li> <li>VESS soil structure on the field</li> <li>CO2burst by rewetting dried soil and measuring how much CO2 was respired in 24 hours</li> </ul> <p>pH and Eh were used to calculate a rH2 hydrogen potential, which combines Eh and pH</p> <p>Background information for clay and organic matter content was determined separately</p> <p>the clay content was defined by sieving and the organic matter content by loss of ignition.</p> <p>The analysis of the results is published in Plant and Soil journal in 2023. </p> <p>Mattila, T.J., 2023. Redox potential as a soil health indicator - how does it compare to microbial activity and soil structure?</p> <p><a href="https://doi.org/10.1007/s11104-023-06305-y">https://doi.org/10.1007/s11104-023-06305-y</a></p>
Soil microbial community composition (16S) data from a laboratory redox fluctuation experiment conducted with an Oxisol and Mollisol
To test the response of microbial communities to periodic oxygen limitation, we conducted a laboratory experiment where two contrasting soils (a rainforest Oxisol from Puerto Rico, and an Iowa cropland Mollisol) were incubated under headspace treatments where oxygen availability varied cyclically over time. Treatments consisted of 0, 2, 4, 8, or 12 d of anoxic conditions (dinitrogen headspace) followed by 4 d of oxic conditions (i.e., ambient oxygen concentrations), and these treatments were repeated for a total of 384 d. At 0, 48, and 384 days, DNA was extracted from replicates from each treatment for sequencing of 16S rRNA amplicons. Companion biogeochemical measurements from this experiment were published previously by Huang et al. (2021a,b). These data support the Hall et al. (2022) manuscript published in Frontiers in Microbiology.
Raw data: Redox protein Memo1 coordinates FGF23-driven signaling and small Rho-GTPases in the kidney
<p>This dataset contains the raw data for "Redox protein Memo1 coordinates FGF23-driven signaling and small Rho-GTPases in the kidney". We investigated the role of Memo1 redox function in FGF23-driven receptor tyrosine kinase signaling in the kidney.</p> <p> </p> <p>Raw data which are not included here can be found using the following accession codes:</p> <p>RNAseq data: NCBI SRA, Accession: PRJNA672305 </p> <p>LC-MS/MS kidney data: proteomeXchange accession PXD022342 </p> <p>LC-MS/MS recombinant protein data: proteomeXchange PXD022382 </p>
Reversible H2 oxidation and evolution by hydrogenase embedded in a redox polymer film
<p>This data set contains the source data of the nature catalysis manuscript NATCATAL-20033655A.</p> <p>All files are named according to the respective figure numbers of the manuscript. </p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.