Investigation of the mechanism of nickel hydroxide formation from nickel nitrate
نویسندگان
چکیده
Nickel hydroxides are widely used as electrochemically active substances in alkaline batteries and hybrid supercapacitors; they can be for electrocatalysis, electrochemical sensors, pigments. Knowledge of the formation mechanism nickel is necessary developing optimizing targeted synthesis methods. The thermal effects processes hydroxide from nitrate were studied by calorimetry method. precipitate was investigated method simultaneous potentiometric (with a glass universal electrode) conductometric titration. content samples obtained at determined NaOH/Ni2+ ratios chemical trilonometry after preliminary dissolution. Calorimetric investigations showed that reaction with NaOH exothermic ΔНreaction=‒28328.5 J/mol. nature dilution process revealed ΔНdilution =‒2454 According to results titration, basic salt NiOHNO3 type not detected. Analysis titration two-stage nitrate. At first stage, which had high rate, due liquid-phase cation hydroxyl anion, primary composition Ni(OH)1.87(NO3)0.13 formed. In second result slow topochemical anions, ions displaced form hydroxide. These data confirmed analysis 1.87 2.2: Ni 52.95 % 55.63 %, corresponding formulas Ni(OH)1.87(NO3)0.13∙0.68H2O Ni(OH)2∙0.71H2O. This clearly indicated nitrate-doped α-Ni(OH)2 final corresponded α-modification
منابع مشابه
An Electrochemical Investigation of Methanol Oxidation on Nickel Hydroxide Nanoparticles
In this work, a nickel-modified glassy carbon electrode (GCE) was prepared using a potentiostatic method in 0.1 M acetate buffer solution at pH 4.0 containing 1.0 mM nickel nitrate. Nickel hydroxide nanoparticles were prepared using consecutive potential scanning in 0.1 M NaOH solution. The as-prepared catalyst was characterized by field emission scanning electron microscopy and electrochemical...
متن کاملXAFS Study of Arsenical Nickel Hydroxide
To Investigate the role played by nickel co-ions in contributing to the stability of arsenic, fluorescence XAFS measurements at both arsenic K-edge and nickel K-edge, respectively, on amorphous arsenical nickel hydroxide, crystalline arsenical nickel hydroxide, and annabergite reference compounds have been carried out. The XAFS results indicate that the arsenic-bearing nickel hydroxides have a ...
متن کاملThe role of nickel and nickel-mediated reactive oxygen species in the mechanism of nickel carcinogenesis.
Increasing evidence demonstrates the reactive oxygen species (ROS) are implicated in metal carcinogenesis. Exposure of cultured Chinese hamster ovary (CHO) cells to several nickel compounds, i.e. NiS, Ni3S2, NiO (black and green), and NiCl2 has been shown to increase oxidation of 2',7-dichlorofluorescein to the fluorescent 2',7-dichlorofluorescein (DCF), suggesting that nickel compounds increas...
متن کاملformation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
15 صفحه اولProton Diffusion in Nickel Hydroxide Films
Electrochemical impedance spectroscopy (EIS) was used to measure the solid-state diffusion coefficient of protons in nickel hydroxide films at room temperature as a function of state of charge (SOC). A model for the complex faradaic impedance of the nickel hydroxide active material is presented and used to extract the diffusion coefficient of protons from the EIS data. Impedance data over a ran...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Eastern-European Journal of Enterprise Technologies
سال: 2023
ISSN: ['1729-3774', '1729-4061']
DOI: https://doi.org/10.15587/1729-4061.2023.272673