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

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Monocrystalline platinum–nickel branched nanocages with enhanced catalytic performance towards the hydrogen evolution reaction

Nanoscale ◽

10.1039/c7nr09116h ◽

2018 ◽

Vol 10 (11) ◽

pp. 5072-5077 ◽

Cited By ~ 22

Author(s):

Zhenming Cao ◽

Huiqi Li ◽

Chenyang Zhan ◽

Jiawei Zhang ◽

Wei Wang ◽

...

Keyword(s):

Catalytic Activity ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Alkaline Solution ◽

Catalytic Performance ◽

Enhanced Stability

Monocrystalline Pt–Ni nanocages were successfully fabricated and exhibited great catalytic activity and enhanced stability for HER in alkaline solution.

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

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.10.6 ◽

2019 ◽

Vol 10 ◽

pp. 62-70 ◽

Cited By ~ 5

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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Catalytic Activity of Rh Nanoparticles with High-index Faces for Hydrogen Evolution Reaction in Alkaline Solution

Chemistry Letters ◽

10.1246/cl.190830 ◽

2020 ◽

Vol 49 (2) ◽

pp. 207-209

Author(s):

Takuo Wakisaka ◽

Kohei Kusada ◽

Dongshuang Wu ◽

Tomokazu Yamamoto ◽

Takaaki Toriyama ◽

...

Keyword(s):

Catalytic Activity ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Alkaline Solution ◽

High Index

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Fabrication of Hybrid Catalyst ZnO Nanorod/α-Fe2O3 Composites for Hydrogen Evolution Reaction

Crystals ◽

10.3390/cryst10050356 ◽

2020 ◽

Vol 10 (5) ◽

pp. 356

Author(s):

Kasimayan Uma ◽

Elavarasan Muniranthinam ◽

Siewhui Chong ◽

Thomas C.-K Yang ◽

Ja-Hon Lin

Keyword(s):

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Nickel Foam ◽

Zno Nanorods ◽

Synergetic Effect ◽

Zno Nanorod ◽

Fe2o3 Nanoparticles ◽

X Ray

This report presents the synthesis of ZnO nanorod/α-Fe2O3 composites by the hydrothermal method with different weight percentages of α-Fe2O3 nanoparticles. The as-synthesized nanorod composites were characterized by different techniques, such as X-ray diffraction (XRD), Fourier transform-infrared (FT-IR), field emission scanning electron microscopy (FE-SEM), electrochemical impedance spectroscopy (EIS), and X-ray photoelectron spectroscopy (XPS). From our results, it was found that the ZnO/α-Fe2O3 (3 wt%) nanorod composites exhibit a higher hydrogen evolution reaction (HER) activity when compared to other composites. The synergetic effect between ZnO and (3 wt%) of α-Fe2O3 nanocomposites resulted in a low onset potential of −125 mV, which can effectively produce more H2 than pure ZnO. The H2 production rate over the composite of ZnO/α-Fe2O3 (3 wt%) clearly shows a significant improvement in the photocatalytic activity in the heterojunction of the ZnO nanorods and α-Fe2O3 nanoparticles on nickel foam.

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Enhancing the catalytic activity of the alkaline hydrogen evolution reaction by tuning the S/Se ratio in the Mo(SxSe1−x)2 catalyst

Nanoscale ◽

10.1039/c8nr05738a ◽

2018 ◽

Vol 10 (34) ◽

pp. 16211-16216 ◽

Cited By ~ 17

Author(s):

Ronen Bar-Ziv ◽

Oren E. Meiron ◽

Maya Bar-Sadan

Keyword(s):

Catalytic Activity ◽

Hydrogen Production ◽

Hydrogen Evolution ◽

Hydrogen Evolution Reaction ◽

Alkaline Solution ◽

Binding Properties

Stronger together: Alloying allows the optimization of the binding properties of Mo(SxSe1−x)2 nanoflowers such that their catalytic activity towards hydrogen production is enhanced in alkaline solution.

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