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And in electrolyte containing Mn 2+ salt, manganese oxide shows significant dissolution in aqueous zinc-ion batteries. MnO 2 deposition on all conductive surfaces is produced by the incorporation of Mn 2+ salt in the electrolyte, requiring that distracting side reactions be eliminated to determine the active phase's dynamics. capacity decreases dramatically and a highly crystalline tetragonal ZnMn 2 O 4 phase forms under dissolution conditions, favoring dissolution, while redeposition helps maintain capacity and promotes a turbulent cubic Zn-rich phase.
Source link: https://www.osti.gov/biblio/1819500
We show the first example of a rechargeable alkaline zinc/copper oxide battery in the first example of a battery chemistry that is supposed to be only primary. Whether you're looking for a unique way to promote Cu 2 O, Cu 2 o, and Cu o was aided by scanning and transmission electrochemical microscopy, cyclic voltammetry, and rotating ring-disc electrode voltammetry, monitored by operando energy-dispersive X-ray diffraction measurements. Bismuth was found to have two roles, reducing cell resistance and promoting Cu and Cu reduction. In addition, we present two limited depths of discharge plans in order to minimize the capacity losss of long-term cycling CuO cells. With near-100 percent Coulombic effectiveness, the CuO cathode's update, as the introduction of additional Cu metal increases the CuO cathode's capacity to a much higher areal capacity of 40 mA h/h/L and record densities of 260 W h/L, enabling operation at tying densities of 260 W h/L.
Source link: https://www.osti.gov/biblio/1834131
On both silica substrates, octahedral Zn ADs features a single K-edge peak, whereas tetrahedral Zn ADs features two absorbance characteristics. Zn on quartz and 3. 2 eV for Zn on SiO 2 are respectively 2. 4 ev for Zn on siO2 and 3. 2 eV for Zn on SiO 2. The XANES spectra of octahedral and tetrahedral Zn ads on silica are not easy to determine by quantitative analysis, despite a linear combination modeling of samples with a mixture of Zn ads diverse shapes. Correlation between XANES spectral characteristics and prior extended X-ray absorption fine structure used for these Zn ads on silica samples provides insight into Zn speciation in natural systems with XANES compatible Zn concentrations too low for EXAFS analysis.
Source link: https://www.osti.gov/biblio/1818467
Following photoexcitation of 1 and 2 in toluene at 295 K, a femtosecond transient absorption spectroscopy shows that the electron transfer rate for 2 is about three times higher than that of 1, which can be accounted for by the statistical characteristics of incoherent ET as well as the charge separation reactions' electron couplings. The electron on NDI 2 u2219- in 2 localizes into one of the two NDIs prior to CR, thus preventing electronic coherent CR from NDI 2 u2219-19-. CR is a spin-coherent process that involves in coherent hopping of the electron between the two NDIs in 2 and 2, consistent with the lack of delocalization described above, results in increased spin decoherence in 2 relative to 1.
Source link: https://www.osti.gov/biblio/1864313
The presence of second phase defects, particularly flux inclusions of tellurium rich compositions, is causing significant challenges for charge collection efficiency in cadmium zinc telluride and cadmium telluride resins intended for applications such as radiation detection. In this research, a forced melt convection technique was used in Vertical Bridgman melt growth of CZT without lowering the required growth rate by 2 mm/hr. Several rotation profiles were compared while adjusting the melt composition from 51. 62 to 61. 75 percent Te, where the Te concentration was initially elevated to increase overall material purity, but eventually increased to improve overall material quality. These ingots had near-total Te concentrations, even with ingots rising from Te concentrations as high as 60. 7 percent at percent Te. A recipe for the reduction of inclusions in CZT melt growth is presented in this paper, and the implications of this procedure on our understanding of inclusion formation are explored.
Source link: https://www.osti.gov/biblio/1801120
Sincerest, a great deal has been paid to the stabilization of atomic platinum catalysts on target substrates in order to minimize Pt consumption, increase the catalyst stability, and later improve catalyst quality in renewable energy sources such as fuel cells and zinc-air batteries. We rationally developed a new method to stabilize atomic Pt catalysts in alloyed platinum cobalt nanosheets with embedded interstitial fluorine for ZABs. The trapped interstitial F atoms in the PtCoF matrix contribute to lattice dispersion, leading to the degradation of the Pt-u2013Co bond, which is the driving force to produce atomic Pt.
Source link: https://www.osti.gov/biblio/1607991
By a significant increase in axial value, the crystal structure of zinc metal deviates from the desired hexagonal close packing system. The local atomic structure of zinc metal is investigated using the total scattering atomic pair distribution function analysis based on X-ray powder diffraction data collected at ambient temperatures. Also, this means that the local structure features in zinc metal differ from those of average building ones.
Source link: https://www.osti.gov/biblio/1617669
Zinc tin nitride semiconductor is a newly developed ternary nitride semiconductor optimized for use in solar cells, light-emitting diodes, and other optoelectronic circuits. Nevertheless, the most common electron scattering methods in ZnSnN 2 are uncertain, especially in the presence of oxygen that is often present during thin film sputter deposition of this material. We'll explore both of these topics here and there with temperature-dependent Hall effect measurements of sputtered ZTNO thin films as a result of Zn composition and O content. The measured temperature dependence of the mobility is attributed to scattering on ionized and neutral defects as well as grain boundary scattering. These neutral defects are likely to arise from the abundant Zn Sn -2O N complexes in the ZTNO material, according to First principles theoretical models. These results also show the key electron scattering mechanisms in polycrystalline sputtered ZTNO, helping position the material for future use in optoelectronic devices.
Source link: https://www.osti.gov/biblio/1544539
On lattice matched and MgO substrates, experiments were carried out on composites of lead zirconate titanate and 2-30-thick nickel zinc ferrite films grown by liquid phase epitaxy. Ferromagnetic resonance was used to determine the consistency of CME from reports on electric field E induced shift in the resonance frequency and thickness, as well as MgO substrate thickness. In samples with NZFO films with orientation rather than films, the CME coupling coefficient A was found to be a factor of 2 to 4 higher. With increasing ferrite film thickness, A decrease in A was measured, and a drastic decrease in the strength of CME was measured for decreasing MgO thickness. The results presented here are also relevant for a new breed of electric field tunable ferrite microwaves.
Source link: https://www.osti.gov/biblio/1512437
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