scholarly journals Study on the Synthesize, Characterization, and Conductive Performance of Nickelzircomolybdnum Heteropoly Acid Salt with Keggin Structure

2019 ◽  
Vol 2019 ◽  
pp. 1-4
Author(s):  
Zhihong Zhang ◽  
Baoying Wang ◽  
Yijing Zhang ◽  
Gehong Zhang ◽  
Yujing Wang
Keyword(s):  
Conduction Mechanism ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Heteropoly Compound ◽  
Electrochemical Impedance Spectrum ◽  
Acid Salt ◽  
X Ray Diffraction ◽  
Protonic Conduction ◽  
X Ray

A novel heteropoly acid salt, Na6[Ni(Mo11ZrO39)]·20H2O, has been synthesized by the means of acidification and adding the reactants into the solution step by step. The heteropoly compound was characterized by elemental analysis, TGA/DSC, infrared spectrum, ultraviolet spectrum, X-ray diffraction, and SEM. Its protonic conduction was measured by the means of the electrochemical impedance spectrum. The results showed that it belongs to the Keggin type, and its conductivity value was 1.23 × 10–2 S/cm at 23°C when the relative humidity was 60%, and the conductivity enhanced with the elevated temperature. Its proton conduction mechanism was in accordance with vehicle mechanism, and the activation energy was 27.82 kJ/mol.

Fe-Doped UiO-66 Combined with ZnIn2S4 for Adsorption and Degradation of RhB Under Visible Light

NANO ◽  
2020 ◽  
Vol 15 (07) ◽  
pp. 2050089
Author(s):  
Litong Niu ◽  
Shaoping Hu ◽  
Yali Ma ◽  
Mingming Wang ◽  
Bolin Lv ◽  
...  
Keyword(s):  
Visible Light ◽  
Electrochemical Impedance ◽  
Diffuse Reflectance Spectroscopy ◽  
Photogenerated Electron ◽  
Impedance Spectrum ◽  
Solvothermal Reaction ◽  
Electrochemical Impedance Spectrum ◽  
X Ray Diffraction ◽  
One Pot ◽  
Ft Ir

Novel ZnIn2S4/FeUiO-66 (ZFeU) photocatalyst with different proportion of FeUiO-66 has been successfully prepared by a facile one-pot solvothermal reaction. The as-synthesized nanocomposites have been thoroughly characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform-infrared spectroscopy (FT-IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), Brunauer–Emmett–Teller (BET) characterization, photoluminescence (PL) analysis and electrochemical impedance spectrum (EIS). The photocatalytic performance of ZFeU nanocomposites for the photodegradation of RhB under visible light irradiation was better than that of ZnIn2S4 and FeUiO-66 alone. The experiment results showed the 20% ZFeU nanocomposites had the best photocatalytic properties. At the same time, a probable mechanism was discussed and it was believed that introduction of FeUiO-66 on ZnIn2S4 would minimize the recombination of photogenerated electron-hole pairs, leading to the enhancement of the photocatalytic activity.

scholarly journals Composition and Performance of Nanostructured Zirconium Titanium Conversion Coating on Aluminum-Magnesium Alloys

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sheng-xue Yu ◽  
Rui-jun Zhang ◽  
Yong-fu Tang ◽  
Yan-ling Ma ◽  
Wen-chao Du
Keyword(s):  
Corrosion Resistance ◽  
Salt Solution ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Conversion Coating ◽  
Mg Alloy ◽  
Electrochemical Impedance Spectrum ◽  
X Ray ◽  
Titanium Salt

Nanostructured conversion coating of Al-Mg alloy was obtained via the surface treatment with zirconium titanium salt solution at 25°C for 10 min. The zirconium titanium salt solution is composed of tannic acid 1.00 g·L−1, K2ZrF60.75 g·L−1, NaF 1.25 g·L−1, MgSO41.0 g/L, and tetra-n-butyl titanate (TBT) 0.08 g·L−1. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FT-IR) were used to characterize the composition and structure of the obtained conversion coating. The morphology of the conversion coating was obtained by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Results exhibit that the zirconium titanium salt conversion coating of Al-Mg alloy contains Ti, Zr, Al, F, O, Mg, C, Na, and so on. The conversion coating with nm level thickness is smooth, uniform, and compact. Corrosion resistance of conversion coating was evaluated in the 3.5 wt.% NaCl electrolyte through polarization curves and electrochemical impedance spectrum (EIS). Self-corrosion current density on the nanostructured conversion coating of Al-Mg alloy is9.7×10-8A·cm-2, which is only 2% of that on the untreated aluminum-magnesium alloy. This result indicates that the corrosion resistance of the conversion coating is improved markedly after chemical conversion treatment.

PREPARATION AND ELECTROCHEMICAL PERFORMANCE OF HYBRID MATERIALS CONTAINING HETEROPOLY ACID WITH DAWSON STRUCTURE AND POLYMERS

2012 ◽  
Vol 05 (04) ◽  
pp. 1250040 ◽  
Author(s):  
XIA TONG ◽  
WEN WU ◽  
SHENGMING ZHOU ◽  
QINGYIN WU ◽  
FAHE CAO ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Xrd Analysis ◽  
Proton Conduction ◽  
Electrochemical Impedance Spectrum ◽  
Grotthuss Mechanism ◽  
Dawson Structure ◽  
Higher Temperature

Highly proton-conducting hybrid materials ( P2W17V /PEG and P2W17V/PEG/SiO2 ) were prepared by heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure ( P2W17V , 90 wt.%), polyethylene glycol (PEG, 10 wt.% and 5 wt.%) and silica gel ( SiO2 , 0 wt.% and 5 wt.%). The products were characterized by the infrared (IR) spectrum, X-ray powder diffraction (XRD) analysis and electrochemical impedance spectrum (EIS). The result reveals that their conductivity values are 1.02 × 10-2 and 2.58 × 10-2S ⋅ cm-1 at room temperature (26°C) and 75% relative humidity (RH), respectively. Their conductivities increase with higher temperature and these activation energies of proton conduction are 9.51 and 14.95 kJ⋅mol-1, which are lower than that of pure heteropoly acid (32.23 kJ⋅mol-1). These mechanisms of proton conduction for these two materials are Grotthuss mechanism.

Solid-State Synthesis and Properties of Y-Doped BaCeO3

2010 ◽  
Vol 654-656 ◽  
pp. 2014-2017 ◽  
Author(s):  
Ying Li ◽  
Yu Shi Ding ◽  
Chang Zhen Wang
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Solid State ◽  
Solid Electrolytes ◽  
Electrochemical Impedance ◽  
Cold Isostatic Pressing ◽  
X Ray Diffraction ◽  
Protonic Conduction ◽  
Powder Mixtures ◽  
X Ray ◽  
Fine Powders

BaCe1-xYxO3-α (x = 0.1, 0.15) solid electrolytes were prepared via ball milling raw powders of BaCO3, CeO2 and Y2O3, and pressing the powder mixtures into tablets followed by calcining in air. X-ray diffraction analysis indicated that the BaCe0.9Y0.1O3-α and BaCe0.85Y0.15O3-α solid solutions were synthesized at 1250°C and 1400°C, respectively. The solid electrolyte disks were made by grinding the calcined tablets into fine powders, cold isostatic pressing into the shape and sintering at 1550°C in air. The electrochemical impedance spectroscopy measurements revealed that they show useful protonic conduction, up to 2.7×10-2 S/cm at 900°C.

scholarly journals Gel Combustion Synthesis and Characterization of ZnO/NiO Nanocomposite for Supercapacitor Application

2019 ◽  
Vol 9 (2S2) ◽  
pp. 304-307 ◽  
Keyword(s):  
Energy Demand ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Green Energy ◽  
Electrochemical Impedance Spectrum ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
X Ray ◽  
Energy Devices ◽  
Gel Combustion

Energy demand is a major concern around the globe of the world. Electrochemical supercapacitors are one among various alternative and green energy devices. The performances of supercapacitors depend mainly on the enhanced properties of electrode materials. In the present work, ZnO/NiO nanocomposite (NCs) was synthesized by a simple and facile citrate-based gel combustion procedure. The crystal structure and phase identification, surface morphology and functional groups of the samples were analyzed by X-ray diffraction (XRD) pattern, scanning electron microscope (SEM) and Fourier-transform infrared spectroscopy (FTIR), respectively. X-ray Diffraction pattern is observed that the crystalline peaks are broader and confirmed nanoparticles. The mean size of the particle is found to be ~25 nm. The prepared sample is analyzed an electrochemical studies such as cyclic Voltammetry, charge discharge and electrochemical impedance spectrum, respectively. The maximum specific capacitance (Scp) is 450 Fg-1 at 0.5 mA/cm2.

Effects of Anions on Corrosion Behavior of Ni-Cu-P Coatings

2010 ◽  
Vol 146-147 ◽  
pp. 1375-1378
Author(s):  
Chong Yang Liu ◽  
Gui Chang Liu ◽  
Sui Lin Wang ◽  
Li Da Wang
Keyword(s):  
Dissolution Rate ◽  
Corrosion Behavior ◽  
Chemical Nature ◽  
Electrochemical Impedance ◽  
Copper Substrate ◽  
Impedance Spectrum ◽  
Electrochemical Impedance Spectrum ◽  
X Ray ◽  
Electron Probe Micro Analyzer ◽  
Coating Composition

Ni-Cu-P coating was synthesized on copper substrate by electroless plating technique. The coating composition and corrosion resistance of Ni-Cu-P coating were characterized using energy-dispersive X-ray (EDX), electron probe micro-analyzer (EPMA), polarization curve (PC) and electrochemical impedance spectrum (EIS). The results show that the chemical nature of anions plays very important roles in the corrosion behavior of Ni-Cu-P coating. At a higher electrolyte concentration, Cl- and SO4 2- ions tend to promote the dissolution rate of Ni by their adsorption, while at lower electrolyte concentrations, NO3 - ions tend to dominate the dissolution rate of Ni-Cu-P coating.

Facile Synthesis of Self-Assembled Flower-Like Mesoporous Zinc Oxide Nanoflakes for Energy Applications

2017 ◽  
Vol 17 (01n02) ◽  
pp. 1760002 ◽  
Author(s):  
P. E. Saranya ◽  
S. Selladurai
Keyword(s):  
Zinc Oxide ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Electrochemical Impedance Spectrum ◽  
Zno Nanoparticle ◽  
X Ray ◽  
Energy Applications ◽  
Zno Nanoflakes ◽  
Self Assembled ◽  
Spectroscopy Studies

Flower-shaped self-assembled zinc oxide (ZnO) nanoflakes were successfully synthesized via a temperature-controlled hydrothermal method. The crystallinity and phase formation of the compound were determined from powder X-ray diffraction (PXRD) result. Surface morphology investigations reveal the self-assembled ZnO nanoflakes to form a spherical flower-like structure. In addition, the particle size was determined from high-resolution transmission electron microscope measurement as 18[Formula: see text]nm which is in accord with XRD and UV results. X-ray photo electron spectroscopy studies reveal the chemical composition and oxidation state of the ZnO nanoparticle. The specific surface area was calculated, and mesoporous nature was confirmed using Brunauer–Emmett–Teller analysis. Results support the superior interaction between the electrode and electrolyte ions through surface pores. Capacitive performance of the ZnO electrode material was determined using cyclic voltammetry and galvanostatic charge/discharge studies, and a maximum specific capacitance of 322[Formula: see text]F/g was obtained at 5[Formula: see text]mV/sec. Electrochemical impedance spectrum reveals the materials fast charge transfer kinetics.

Solid high-proton conductor tungstovanadozincic acid with transition metal as central atom: Synthesis and conductivity

2015 ◽  
Vol 08 (04) ◽  
pp. 1550041 ◽  
Author(s):  
Tianpei Huang ◽  
Xuefei Wu ◽  
Qingyin Wu ◽  
Fahe Cao ◽  
Wenfu Yan
Keyword(s):  
Activation Energy ◽  
Transition Metal ◽  
Heteropoly Acid ◽  
Electrochemical Impedance ◽  
Central Atom ◽  
Proton Conductor ◽  
Impedance Spectrum ◽  
Electrochemical Impedance Spectrum ◽  
High Proton ◽  
C 50

A Keggin-type vanadium-substituted tungstovanadozincic heteropoly acid H 7 ZnW 11 VO 40 ⋅ 8 H 2 O , with the transition metal as central atom, was firstly synthesized and characterized. Its proton conductivity was measured by the electrochemical impedance spectrum (EIS), and the result indicates that the H 7 ZnW 11 VO 40 ⋅ 8 H 2 O is a solid high-proton conductor with conductivity of 3.26 × 10-3S ⋅ cm-1 at 58°C, 50% relative humidity. Its activation energy is 29.50 kJ ⋅ mol-1, which suggests that the mechanism of proton conduction is the Vehicle mechanism.

scholarly journals The Influence of Dopant Concentration on Optical-Electrical Features of Quantum Dot-Sensitized Solar Cell

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2865
Author(s):  
Dang Huu Phuc ◽  
Ha Thanh Tung ◽  
Van-Cuong Nguyen ◽  
My Hanh Nguyen Thi
Keyword(s):  
Thin Films ◽  
Quantum Dot ◽  
Electrochemical Impedance ◽  
Impedance Spectrum ◽  
Photocurrent Density ◽  
Band Gap Energy ◽  
Electrochemical Impedance Spectrum ◽  
X Ray Diffraction ◽  
Electron Phonon Interaction ◽  
Optical Films

In this study, TiO2/CdS/CdxCu1−xSe, TiO2/CdS/CdxMn1−xSe, and TiO2/CdS/CdxAg2−2xSe thin films were synthesized by chemical bath deposition for the fabrication of photoanode in quantum-dot-sensitized solar cells. As a result, the structural properties of the thin films have been studied by X-ray diffraction, which confirmed the zinc Blende structure in the samples. The optical films were researched by their experimental absorption spectra with different doping concentrations. Those results were combined with the Tauc correlation to estimate the absorption density, the band gap energy, valence band and conduction band positions, steepness parameter, and electron–phonon interaction. Furthermore, the electrical features, electrochemical impedance spectrum and photocurrent density curves were carried out. The result was used to explain the enhancing performance efficiency.

Effect of Zn Content on Structure, Roughness and Corrosion Behavior of Zn-Ni Alloys

2019 ◽  
Vol 17 (17) ◽  
pp. 17-22
Author(s):  
Hayette Faid
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Stripping Voltammetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Alloys ◽  
Sulfate Bath ◽  
Zn Content ◽  
Polarization Test ◽  
Δ Phase

AbstractIn this work, Zn-Ni alloys have been deposited on steel from sulfate bath, by electrodeposition method. The effect of Zn content on deposits properties was studied by cyclic voltammetry (CV), chronoaperometry (CA), linear stripping voltammetry (ALSV) and diffraction (XRD) and scanning electronic microscopy (SEM). The corrosion behavior in 3.5 wt. NaCl solution was examined using anodic polarization test and electrochemical impedance spectroscopy. X-ray diffraction of show that Zn-Ni alloys structure is composed of δ phase and γ phase, which increase with the decrease of Zn content in deposits. Results show that deposits obtained from bath less Zn2+ concentration exhibited better corrosion resistance.

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