Cobalt Hydroxide Nitrate Research Articles

Ce-doped cobalt-based hydroxide assisted with low-temperature molten salt for industrial oxygen evolution reaction

Developing low cost and high-performance oxygen evolution electrocatalysts is significant to improve the efficiency of water electrolysis for large-scale hydrogen production. Cobalt hydroxide is a promising electrocatalyst for oxygen evolution reaction (OER), but its poor conductivity and activity seriously restrict the practical application. A simple one-step low temperature molten salt method was applied to successfully synthesize the Ce-doped cobalt hydroxide nitrate (Ce-CoNH/CF), which exhibits outstanding OER performance with a low overpotential of 448 mV at the current density of 1000 mA/cm2 in 1 mol/L KOH. The remarkable performance of Ce-CoNH/CF electrode in OER may be the comprehensive result of fast reaction kinetics, large electrochemical active specific surface area (ECSA) and small charge transfer resistance (Rct) as revealed by the Tafel, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) analysis. Under the simulated industrial test conditions (6 mol/L KOH, 70 °C), the Ce-CoNH/CF electrode still displays excellent OER performance.

Solvothermal synthesis of nickel cobalt hydroxide nitrate on CuO nanowires via redox reaction between nitrate and ethanol for electrochemical energy storage

Due to high theoretical capacity and good electrochemical stability, nickel-cobalt hydroxide has attracted extensive attention in alkaline energy storage applications. In this work, we coated nickel cobalt hydroxide nitrate nanosheets arrays on CuO nanowires using a simple solvothermal reaction without any alkali sources and additional oxidants. The three-dimensional structure of core-shell nanowire arrays and the synergistic combination of Ni2+ and Co2+/Co3+ resulted in a large specific capacity of 3.76 mAh cm−2 (43.2 F cm−2) under 11.6 mg cm−2. At the power density of 0.754 kW kg−1, the energy density of as-fabricated nickel-zinc battery can reach 530.1 Wh kg−1, indicating excellent alkaline energy storage performance.

Composites of polyethylene and layered cobalt hydroxide salts as potential ultraviolet radiation absorbers

This paper describes the synthesis of cobalt hydroxide nitrate (CoHN) and cobalt hydroxide p-aminobenzoate (CoHAB), which were dispersed in polyethylene with the objective of protecting the polymer from ultraviolet (UV) radiation degradation. First, CoHN was synthesized by urea hydrolysis in the presence of Co(II) nitrate and the intercalation of p-aminobenzoate into CoHAB was performed under hydrothermal alkaline conditions. The structure and thermal stability of the CoHN and CoHAB were characterized by several instrumental techniques. Results indicated that both fillers were dispersed in polyethylene and absorb radiation in the whole UV range, modifying the behavior of the polymer degradation under artificial weathering conditions.

Preparation and X-ray diffraction characterization of two modifications of the cobalt hydroxide nitrate Co(OH)NO 3 · H 2O

Samples of cobalt hydroxide nitrate, Co(OH)NO 3 · H 2O, have been prepared by thermal treatment of Co(NO 3) 2 · 6H 2O melts at different temperatures, in the presence of soft hydrolyzing agents, such as urea or ammonium hydrogen carbonate amide. The results of chemical analyses and the values of the unit cell parameters, refined from X-ray powder diffraction data, have shown that the investigated compound crystallizes in two different monoclinic modifications, whose relative amount varies depending on the temperature of preparation.

Cobalt hydroxide nitrate hydrate, Co(OH)(NO3).cntdot.H2O: a novel double-chain compound with competing interactions

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt hydroxide nitrate hydrate, Co(OH)(NO3).cntdot.H2O: a novel double-chain compound with competing interactionsS. Angelov, M. Drillon, E. Zhecheva, R. Stoyanova, M. Belaiche, A. Derory, and A. HerrCite this: Inorg. Chem. 1992, 31, 8, 1514–1517Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://doi.org/10.1021/ic00034a037RIGHTS & PERMISSIONSArticle Views330Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (473 KB) Get e-AlertsSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts

X-ray diffraction study of mixed Cu – Co hydroxide nitrates

Abstract The dependence of the unit-cell parameters of copper(II)-cobalt(II) hydroxide nitrate mixed crystals Cu x Co2 – x (OH)3NO3 on x have been studied by means of X-ray powder diffraction techniques. It has been shown that the relatively rapid precipitation of the hydroxide nitrates leads to the formation of monophase continuous solid solutions. The pure cobalt hydroxide nitrate and the intermediate compounds below x = 1.0 are monoclinic pseudohexagonal. For x = 1.0 a short-range order occurs, so that copper and cobalt ions are in different crystallographic positions.

Zinc-cobalt oxide spinels with precursor-controlled degree of inversion

Zinc-cobalt oxide spinels, ZnCo2O4, have been prepared by thermal decomposition of three different precursors: (I) coprecipitated zinc-cobalt hydroxide nitrate; (II) coprecipitated zinc-cobalt hydroxide, and (III) zinc-cobalt hydroxide nitrate prepared by isomorphous replacement of the tetrahedrally coordinated Co2+ ions in the double-layered parent cobalt hydroxide nitrate by Zn2+ ions. It has been shown that the cationic distribution in the oxide product is predetermined by the cationic distribution of the precursor. The coprecipitated precursors (I) and (II) decompose to statistical spinels, whereas precursor (III) decomposes to a normal Zn [Co2]O4 spinet.