The Hydrogen Evolution Reaction on Ni Electrode Material Modified with Molybdenum(IV) Oxide and Chromium(III) Oxide Powders

2015 ◽  
Vol 228 ◽  
pp. 273-276
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz
Keyword(s):  
Steady State ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Room Temperature ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Nickel Matrix ◽  
Oxide Powders ◽  
Galvanostatic Conditions

The Ni+MoO2and Ni+Cr2O3composite coatings were prepared by the electrodeposition under the galvanostatic conditions (jdep= -200 mA cm-2) from the nickel bath containing powder of MoO2or Cr2O3. Studies of hydrogen evolution reaction (HER) in 5 M KOH solution at room temperature were conducted using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was ascertained that the HER rate is higher for the Ni+MoO2composite electrode in comparison with the Ni+Cr2O3composite electrode due to the presence of Mo in the nickel matrix.

Effect of Molybdenum(IV) Oxide on the Process of Hydrogen Evolution on Ni+Mo Electrolytic Composite Coatings

2015 ◽  
Vol 228 ◽  
pp. 277-282
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz
Keyword(s):  
Composite Coating ◽  
Hydrogen Evolution ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Nickel Matrix ◽  
Nickel Plating ◽  
Composite Component ◽  
Plating Bath ◽  
Deposition Current Density

The Ni+Mo and Ni+MoO2+Mo composite coatings were electrodeposited at the constant deposition current density ofjdep= -200 mA cm-2from the nickel plating bath containing powder of Mo or MoO2and Mo. The investigations of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature using steady-state polarization and electrochemical impedance spectroscopy (EIS) techniques. It was found that for the Ni+MoO2+Mo composite coating the increase in the activity of HER was observed in comparison with Ni+Mo composite coating probably due to the more porous surface and presence of additional composite component (MoO2) in the nickel matrix.

The Influence of Temperature of Electrodeposition on the Electrochemical Properties of Ni+MoS2+Mo Composite Coatings

2015 ◽  
Vol 228 ◽  
pp. 263-268
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz
Keyword(s):  
Steady State ◽  
Electrochemical Impedance Spectroscopy ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Intrinsic Activity ◽  
Influence Of Temperature ◽  
Surface Development ◽  
Eis Measurements ◽  
Galvanostatic Conditions

The Ni+MoS2+Mo composite coatings were obtained by the electrodeposition under the galvanostatic conditions (jdep= -250 mA cm-2) at the temperature of 30-60°C from the nickel bath containing a suspension of MoS2(<2 μm) and Mo (3-7 μm) powders. Studies of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature using steady-state polarization and electrochemical impedance spectroscopy (EIS) measurements. The decrease of electrochemical activity towards the HER was found for the Ni+MoS2+Mo composite coatings with the increase in the temperature of their electrodeposition due to decrease of both the intrinsic activity and surface development.

The Influence of Temperature of Electrodeposition on the Electrochemical Properties of Ni+MoS2 Composite Coatings

2015 ◽  
Vol 228 ◽  
pp. 237-241
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz
Keyword(s):  
Steady State ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Porous Electrodes ◽  
Plating Bath ◽  
Influence Of Temperature ◽  
Surface Development ◽  
Kinetics Of ◽  
Crystalline Component ◽  
Galvanostatic Conditions

The Ni+MoS2composite coatings were prepared by electrodeposition under galvanostatic conditions from the Ni-plating bath containing suspended MoS2powder (100 mesh). Investigations of hydrogen evolution reaction (HER) were carried out using steady-state polarization measurements and electrochemical impedance spectroscopy (EIS) in 5 M KOH solution on the coatings obtained at 30, 40, and 50°C. It was found that the kinetics of the HER on the Ni+MoS2coatings decreases with the increase in the electrodeposition temperature of the coatings. This effect is attributed to decreasing content of MoS2(from 26.4 to 18.0 wt.%) embedded into the Ni matrix as composite crystalline component having the electrocatalytic properties towards the HER and/or surface development of the coatings. The higher amount of MoS2was embedded, the more porous electrodes containing pear-shape pores on the surface were produced what was detected by EIS.

scholarly journals Electrodeposition and characterization of Ni-MoO2 composite coatings as cathodes for the hydrogen evolution reaction in alkaline solution

2013 ◽  
Vol 78 (4) ◽  
pp. 549-554 ◽  
Author(s):  
Uros Lacnjevac
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Solution ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Theoretical Interpretation ◽  
X Ray ◽  
Polarization Measurements ◽  
Naoh Solution

Composite Ni-MoO2 coatings were prepared and characterized with respect to their possible application as electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solution. The composites were electrodeposited onto Ni meshes from an ammonium chloride Ni solution with suspended MoO2 particles in simulated industrial conditions for production of commercial cathodes. The influence of the concentration of MoO2 particles in the solution and deposition current density on the morphology, chemical and phase composition of obtained coatings was investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Catalytic activity for the HER of the coatings was examined by polarization measurements in a 32 wt. % NaOH solution at 90?C and compared to the activity of the commercial De Nora?s cathode (DN). It was shown that the most active Ni-MoO2 coating exhibits better polarization characteristics for the HER than the DN cathode. The mechanism of the HER on the specified Ni-MoO2 coating was investigated in 8 mol dm-3 NaOH at 30?C by means of steady-state polarization measurements and an electrochemical impedance spectroscopy (EIS) method. Based on the theoretical interpretation of the experimental data, rate constants of the three individual steps of the HER were determined and the source of catalytic activity of the coating was elucidated.

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

2015 ◽  
Vol 228 ◽  
pp. 258-262 ◽  
Author(s):  
Magdalena Popczyk ◽  
Bożena Łosiewicz ◽  
A. Budniok
Keyword(s):  
Steady State ◽  
Electrochemical Impedance Spectroscopy ◽  
Room Temperature ◽  
Electrochemical Impedance ◽  
Nanocomposite Coatings ◽  
Intrinsic Activity ◽  
Real Surface ◽  
Galvanostatic Conditions ◽  
Area Development ◽  
Real Surface Area

The Ni+NiAl nanocomposite coatings were prepared by the electrodeposition under the galvanostatic conditions (jdep= -250 mA cm-2) from the nickel bath containing the suspension of NiAl nanopowder. For comparison, the Ni coatings were also obtained. The combined steady-state polarization and electrochemical impedance spectroscopy (EIS) investigations of hydrogen evolution reaction (HER) were carried out in 5 M KOH solution at room temperature. It was found that the Ni+NiAl nanocomposite coatings revealed higher apparent electrocataltic activity towards the HER as compared to the comparable Ni deposits due to the increase in the real surface area development and the intrinsic activity.

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.

Electrochemical Characterization of Nickel-Based Composite Coatings Containing Molybdenum or Tungsten Nanopowders

2015 ◽  
Vol 228 ◽  
pp. 283-287
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
A. Budniok
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Composite Coatings ◽  
Electrochemical Activity ◽  
Electrochemical Characterization ◽  
Nanocomposite Coatings ◽  
Kinetics Of ◽  
Galvanostatic Conditions

The Ni+Mo and Ni+W nanocomposite coatings were prepared by electrodeposition under the galvanostatic conditions (jdep= -300 mA cm-2) from the nickel bath containing nanopowders of molybdenum (<100 nm) or tungsten (<150 nm). Kinetics of hydrogen evolution reaction (HER) was studied in 5 M KOH solution at room temeprature. The reason of revealed higher electrochemical activity towards the HER in case of the Ni+Mo nanocomposite electrode as compared to that of the Ni+W nanocomposite electrode, has been discussed.

The Hydrogen Evolution Reaction on Electrolytic Nickel-Based Coatings Containing Metallic Molybdenum

2010 ◽  
Vol 636-637 ◽  
pp. 1036-1041 ◽  
Author(s):  
Magdalena Popczyk
Keyword(s):  
Composite Coating ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Alloy Coating ◽  
Electrochemical Activity ◽  
Real Surface ◽  
Eis Measurements ◽  
Galvanostatic Conditions

Ni-Mo and Ni+Mo coatings were prepared by electrodeposition under the galvanostatic conditions, in such a manner that the coatings contain the same quantity of molybdenum. The electrochemical activity of these coatings was studied in the process of hydrogen evolution reaction (HER) from 5 M KOH solution using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. Basing on the results of EIS measurements, the rate constants of the HER as well as the surface roughness factors were determined. It was found that Ni+Mo composite coating is characterized by enhanced electrochemical activity towards hydrogen evolution as compared with Ni-Mo alloy coating. Improvement of the electrocatalytic performance of Ni+Mo composite coating could be attributed to the increase in its real surface area as well as to the catalytic effect in points of contact of molybdenum and nickel matrix. Thus obtained composite coating may be useful in application as electrode materials for the hydrogen evolution reaction.

scholarly journals Amorphous Ni x Co y P-supported TiO2 nanotube arrays as an efficient hydrogen evolution reaction electrocatalyst in acidic solution

2019 ◽  
Vol 10 ◽  
pp. 62-70 ◽  
Author(s):  
Yong Li ◽  
Peng Yang ◽  
Bin Wang ◽  
Zhongqing Liu
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Nanotube Arrays ◽  
Active Surface Area ◽  
X Ray ◽  
Transmission Electron

Bimetallic phosphides have been attracting increasing attention due to their synergistic effect for improving the hydrogen evolution reaction as compared to monometallic phosphides. In this work, NiCoP modified hybrid electrodes were fabricated by a one-step electrodeposition process with TiO2 nanotube arrays (TNAs) as a carrier. X-ray diffraction, transmission electron microscopy, UV–vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy and scanning transmission electron microscopy/energy-dispersive X-ray spectroscopy were used to characterize the physiochemical properties of the samples. The electrochemical performance was investigated by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. We show that after incorporating Co into Ni–P, the resulting Ni x Co y P/TNAs present enhanced electrocatalytic activity due to the improved electron transfer and increased electrochemically active surface area (ECSA). In 0.5 mol L−1 H2SO4 electrolyte, the Ni x Co y P/TNAs (x = 3.84, y = 0.78) demonstrated an ECSA value of 52.1 mF cm−2, which is 3.8 times that of Ni–P/TNAs (13.7 mF cm−2). In a two-electrode system with a Pt sheet as the anode, the Ni x Co y P/TNAs presented a bath voltage of 1.92 V at 100 mA cm−2, which is an improvment of 79% over that of 1.07 V at 10 mA cm−2.

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