Electrochemical Characterization of Nickel-Phosphorus Based Coatings Containing Cobalt

2015 ◽  
Vol 228 ◽  
pp. 299-304
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Porous Electrode ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
Morphology Characterization ◽  
Galvanostatic Conditions ◽  
Matrix Powder ◽  
Xrd Method

The Ni-P, Ni-Co-P and Ni-P+Co coatings were obtained in galvanostatic conditions at the current density ofjdep= -200 mA cm-2. A stereoscopic microscope was used for surface morphology characterization of the coatings. The X-ray diffraction (XRD) method was used to determine phase composition of the coatings and the atomic absorption spectrometry (AAS) was applied to specify their chemical composition. The behavior of the obtained coatings was investigated in the process of hydrogen evolution reaction (HER) from 5 M KOH using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that introduction into Ni-P amorphous matrix powder of cobalt produced porous electrode materials which could be used for the HER.

Structure and Electrochemical Characterization of Electrolytic Ni-Co-P and Ni-W-P Layers

2006 ◽  
Vol 514-516 ◽  
pp. 460-464 ◽  
Author(s):  
Magdalena Popczyk ◽  
Antoni Budniok ◽  
Henryk Scholl ◽  
Tadeusz Blaszczyk
Keyword(s):  
Electrode Materials ◽  
Diffraction Method ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Developed Surface ◽  
P Matrix ◽  
Morphology Characterization ◽  
Galvanostatic Conditions

Ni-P, Ni-Co-P and Ni-W-P layers were obtained in galvanostatic conditions, at the current density jdep= 0.200 A cm-2. The X-ray diffraction method was used to determine phase composition of the layers and the atomic absorption spectrometry was applied to specify their chemical composition. A metallographic, stereoscopic and tunneling microscope and also Form Talysurf-type profilograph were used for cross-section and surface morphology characterization of the layers. The behaviour of obtained layers was investigated in the processes of hydrogen and oxygen evolution from 5 M KOH using voltammetry method. It was ascertained that, introduction of cobalt or tungsten into Ni-P matrix, lead to obtain the layers about very developed surface. Thus obtained layers may be useful in application as electrode materials in electrochemistry.

Comparison of Electrochemical Properties of Ni+MoS2 and Ni Coatings in an Alkaline Solution

2015 ◽  
Vol 228 ◽  
pp. 225-230
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz
Keyword(s):  
Electron Microscope ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Molybdenum Sulfide ◽  
Nickel Matrix ◽  
Morphology Characterization ◽  
Galvanostatic Conditions ◽  
Scanning Electron

The Ni+MoS2composite coatings were obtained by electrolytic co-deposition of crystalline nickel with molybdenum sulfide powder from an electrolyte containing suspension of this powder. For comparison, the Ni coating was also deposited. These coatings were obtained in galvanostatic conditions at the current density ofjdep= -250 mA cm-2. A scanning electron microscope was used for surface morphology characterization of the coatings. The behavior of the coatings was investigated in the process of hydrogen evolution reaction from 5 M KOH solution using steady-state polarization and electrochemical impedance spectroscopy methods. It was found that introduction of molybdenum sulfide into nickel matrix, evokes developed and rough surface which is the reason for the increase in the rate of the HER as comapred to the smooth Ni electrode. Thus obtained coatings may be useful in application as electrode materials for the HER.

Production and Structure of Nickel-Phosphorus Electrolytic Coatings Modified with Metallic Tungsten or Nickel Oxide

2015 ◽  
Vol 228 ◽  
pp. 163-167
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Nickel Oxide ◽  
Surface Characterization ◽  
Electrode Materials ◽  
Tungsten Powder ◽  
X Ray Diffraction ◽  
X Ray ◽  
P Matrix ◽  
Galvanostatic Conditions ◽  
Xrd Method

Electrodeposited Ni-P, Ni-W-P, Ni-P+W and Ni-P+NiO+W coatings were obtained in the galvanostatic conditions at the current density jdep = -200 mA cm-2. A stereoscopic microscope was used for surface characterization of the coatings. The phase composition of the coatings was determined using X-ray diffraction (XRD) method. The chemical composition of the deposits was determined using atomic absorption spectroscopy (AAS). It was found out that the introduction of the tungsten powder in one case, and the nickel oxide and tungsten powder in the other into the electrolytic Ni-P matrix results in obtaining the coatings with a very rough surface. The coatings obtained in this way may be useful while applying them as electrode materials in electrochemistry.

Electrodeposition and Thermal Treatment of Nickel Coatings Containing Cobalt

2015 ◽  
Vol 228 ◽  
pp. 158-162
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Thermal Treatment ◽  
Absorption Spectrometry ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Nickel Coatings ◽  
Developed Surface ◽  
Surface Development ◽  
Multi Phase ◽  
Morphology Characterization

The Ni-P and Ni-Co-P coatings were electrodeposited at the deposition current density ofjdep= -20 mA cm-2. Thermal treatment of these coatings was conducted in air at 400oC for 1 h. Scanning electron microscopy (SEM) was used for surface morphology characterization of the coatings. Phase composition was investigated by X-ray diffraction (XRD) method. Atomic absorption spectrometry (AAS) was applied to specify chemical composition of obtained coatings. It was found that introduction of Co into amorphous Ni matrix caused the surface development of the obtained deposit. The Ni-P coating revealed an amorphous structure. The Ni-Co-P coating was formed of the amorphous matrix and the amorphous alloy ingredient. Thermal treatment of the coatings allowed to obtain new multi-phase materials with slightly developed surface.

Synthesis and characterization of MnO2nanowires

2017 ◽  
Vol 31 (02) ◽  
pp. 1750006 ◽  
Author(s):  
Mohammad Hossein Ghorbani ◽  
Abdol Mahmood Davarpanah
Keyword(s):  
Lithium Batteries ◽  
Manganese Oxides ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Method

Manganese oxides are of more interest to researchers because of their ability as catalysts and lithium batteries. In this research, MnO2nanowires with diameter about 45 nm were synthesized by sol–gel method at room temperature (RT). Effect of increasing the annealing temperature from 400[Formula: see text]C to 600[Formula: see text]C on crystalline structure of nanostructure were studied and average crystallite size was estimated about 22 nm. X-ray Diffraction (XRD) method, Energy-Dispersive X-ray Diffraction (EDXD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM) were used to characterize the nanowires of MnO2.

Influence of Thermal Treatment on the Electrochemical Properties of Ni+W+Mo+Si Composite Coatings in an Alkaline Solution

2015 ◽  
Vol 228 ◽  
pp. 305-309
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Thermal Treatment ◽  
Composite Coatings ◽  
Electrochemical Corrosion ◽  
Argon Atmosphere ◽  
X Ray Diffraction ◽  
Corrosion Resistant ◽  
X Ray ◽  
Electrochemical Corrosion Resistance ◽  
Galvanostatic Conditions ◽  
Xrd Method

The Ni+W+Mo+Si composite coatings were prepared by electrodeposition under the galvanostatic conditions (jdep= -100 mA cm-2) from the nickel bath containing powders of tungsten, molybdenum and silicon. Thermal treatment of the obtained coatings was conducted in argon atmosphere. Chemical composition of the coatings was determined by energy dispersive spectrocopy (EDS). Phase composition investigations were conducted by X-ray diffraction (XRD) method. Studies of electrochemical corrosion resistance were carried out in 5 M KOH solution. On the basis of these investigations it was found that Ni+W+Mo+Si thermally treated coating is more corrosion resistant than Ni+W+Mo+Si as-deposited coating.

Synthesis and Characterization of Li0.97K0.03FePO4/Graphene Composites by Carbonthermal Reduction Method

2014 ◽  
Vol 687-691 ◽  
pp. 4327-4330
Author(s):  
Yan Wang ◽  
Zhe Sheng Feng ◽  
Lu Lin Wang ◽  
Jin Ju Chen ◽  
Zhen Yu He
Keyword(s):  
Discharge Capacity ◽  
Photoelectron Spectroscopy ◽  
Reduction Method ◽  
Electrochemical Impedance ◽  
Impedance Spectra ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Electrochemical Impedance Spectra ◽  
X Ray

Li0.97K0.03FePO4 and Li0.97K0.03FePO4/graphene composites were synthesized by carbothermal reduction method using acetylene black as carbon source. The structure and electrochemical properties of the prepared materials were investigated with X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, galvanostatic charge and discharge and electrochemical impedance spectra tests. The results indicated that K doping improves the cyclic stability of samples, the addition of small amounts of graphene results in better electronic properties on sample. Li0.97K0.03FePO4/graphene showed discharge capacity of 158.06 and 90.55 mAh g-1 at 0.1 C and 10 C, respectively. After the 50 cycle test at different rates, the reversible discharge capacity at 0.1 C was 158.58 mAh g-1, indicating the capacity retention ratio of 100.32%.

Preparation and Characterization of a Novel Fluorocarbon Nano Material

2011 ◽  
Vol 236-238 ◽  
pp. 1958-1961
Author(s):  
Jian Ping Hu ◽  
Mei Yu ◽  
Jian Hua Liu ◽  
Song Mei Li ◽  
Jun Xiu Shi
Keyword(s):  
Raw Material ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Molecule Structure ◽  
Transmission Electron ◽  
Nano Material ◽  
Dta Curves ◽  
Dta Curve ◽  
Morphology Characterization

In this article, preparation approach of a novel fluorocarbon nano material was described. The molecule structure, thermal properties and morphology characterization of the fluorocarbon nano material were studied out by Fourier transform infrared spectroscopy (FTIR), thermal gravity and differential thermal analysis (TG-DTA), transmission electron microscope (TEM) and X-ray diffraction analysis (XRD). It was showed that the basic molecule structure of the fluorocarbon nano material was same as the raw material (FKM) except that a new C=C bond was produced in the fluorocarbon nano material at 1624cm-1. It was demonstrated that the morphology of the fluorocarbon nano material was unattached particles with particle size between 40-60nm under TEM. From TG-DTA curves, it was indicated that the fluorocarbon nano material was high thermal stabile, which oxidizing decomposing temperature in air and thermal decomposing temperature in N2 were 322°C and 295°C, respectively. The XRD pattern showed that the diffraction peak of amorphous carbon was disappeared when the fluoronano material was baked in air at 350°C, and this result validates the oxidizing decomposing of the fluorocarbon nano material at 322°C of the TG-DTA curve.

Electrolytic Production and Structure of Ni+Al+Ti Composite Coatings

2015 ◽  
Vol 228 ◽  
pp. 168-171
Author(s):  
Iwona Napłoszek ◽  
Eugeniusz Łągiewka ◽  
A. Budniok ◽  
Magdalena Popczyk ◽  
Grzegorz Dercz ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
Electrolytic Production ◽  
X Ray ◽  
Electrochemical Processes ◽  
Three Phase ◽  
Multi Phase ◽  
Galvanostatic Conditions ◽  
Xrd Method

The Ni+Al+Ti composite coatings were prepared by the electrodeposition under the galvanostatic conditions at the deposition current denisty ofjdep= -225 mA cm-2. Phase composition investigations were conducted by X-ray diffraction (XRD) method. The surface morphology, cross-section and chemical composition of the coatings were examined using a scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. Thermal treatment of the obtained composite coatings was conducted in argon atmosphere at the temperature of 800oC for 12 h. It was found that the as-deposited Ni+28at.%Al+25at.%Ti composite coating is a three-phase material (Ni, Al and Ti phases). The thermal treatment caused the chemical reaction in solid state of the heated coating, and a new multi-phase material was formed containing Ni and Al metallic phases as well as NiAl, Ni2Al3, Ni3Al, NiTi, NiTi2and Ni3Ti intermetallic phases. Thus obtained composite coatings may be useful in the applications as materials in the electrochemical processes.

scholarly journals Electrochemical and electron microscopic characterization of Super-P based cathodes for Li–O2 batteries

2013 ◽  
Vol 4 ◽  
pp. 665-670 ◽  
Author(s):  
Mario Marinaro ◽  
Santhana K Eswara Moorthy ◽  
Jörg Bernhard ◽  
Ludwig Jörissen ◽  
Margret Wohlfahrt-Mehrens ◽  
...  
Keyword(s):  
Lithium Salt ◽  
Electrochemical Impedance ◽  
Ex Situ ◽  
Cathode Side ◽  
Li Ion Batteries ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
X Ray ◽  
Li Ion

Aprotic rechargeable Li–O2 batteries are currently receiving considerable interest because they can possibly offer significantly higher energy densities than conventional Li-ion batteries. The electrochemical behavior of Li–O2 batteries containing bis(trifluoromethane)sulfonimide lithium salt (LiTFSI)/tetraglyme electrolyte were investigated by galvanostatic cycling and electrochemical impedance spectroscopy measurements. Ex-situ X-ray diffraction and scanning electron microscopy were used to evaluate the formation/dissolution of Li2O2 particles at the cathode side during the operation of Li–O2 cells.

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