NiMo Nanoparticles Electrodeposited by Pulsed Current and Their Catalytic Properties for Hydrogen Production

Lucatero, Savidra; Tamayo, Gabriel; Crespo, Diego; Mariño, Ernesto; Videa, Marcelo

doi:10.14447/jnmes.v16i3.8

Cited by 3 publications

(3 citation statements)

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“…Like their individual constituent metals, mixed-metal catalysts are often tested for HER activity in basic conditions. − ,− However, if the alloy contains a metal with superior chemical resistance, then operation in acidic conditions is also possible (e.g., Mo-containing films). ,, Mixed-metal catalysts typically display improved activity compared to their corresponding single-metal films. For example, Navarro-Flores et al synthesized Ni and various Ni alloys (Mo, W, Fe), where Ni activity was η 10 mA = 510 mV and NiMo showed η 10 mA = 100 mV in 0.5 M H 2 SO 4 .…”

Section: Electrochemical Synthesis Of Hydrogen Evolution Catalystsmentioning

confidence: 99%

Electrochemical Synthesis of Photoelectrodes and Catalysts for Use in Solar Water Splitting

et al. 2015

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This review focuses on introducing and explaining electrodepostion mechanisms and electrodeposition-based synthesis strategies used for the production of catalysts and semiconductor electrodes for use in water-splitting photoelectrochemical cells (PECs). It is composed of three main sections: electrochemical synthesis of hydrogen evolution catalysts, oxygen evolution catalysts, and semiconductor electrodes. The semiconductor section is divided into two parts: photoanodes and photocathodes. Photoanodes include n-type semiconductor electrodes that can perform water oxidation to O2 using photogenerated holes, while photocathodes include p-type semiconductor electrodes that can reduce water to H2 using photoexcited electrons. For each material type, deposition mechanisms were reviewed first followed by a brief discussion on its properties relevant to electrochemical and photoelectrochemical water splitting. Electrodeposition or electrochemical synthesis is an ideal method to produce individual components and integrated systems for PECs due to its various intrinsic advantages. This review will serve as a good resource or guideline for researchers who are currently utilizing electrochemical synthesis as well as for those who are interested in beginning to employ electrochemical synthesis for the construction of more efficient PECs.

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Section: Electrochemical Synthesis Of Hydrogen Evolution Catalystsmentioning

confidence: 99%

Electrochemical Synthesis of Photoelectrodes and Catalysts for Use in Solar Water Splitting

et al. 2015

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“…Our group previously used single‐pulse galvanostatic electrodeposition to generate Ni thin‐layers on a Au electrode; the Ni deposits exhibit high catalytic activity for methanol electro‐oxidation [25] . The same methodology can be used to obtain NiMo deposits with HER activity in acidic media [26] . Herein we report a systematic study on the influence of the applied current density on the PtNi deposit's activity and surface composition for HER in alkaline media.…”

Section: Introductionmentioning

confidence: 98%

“…[25] The same methodology can be used to obtain NiMo deposits with HER activity in acidic media. [26] Herein we report a systematic study on the influence of the applied current density on the PtNi deposit's activity and surface composition for HER in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Galvanostatically Deposited PtNi Thin‐Films as Electrocatalysts for the Hydrogen Evolution Reaction

Medrano-Banda¹,

Crespo-Yapur²,

Velasco-Soto³

et al. 2022

ChemistryOpen

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The synthesis of hybrid platinum materials is fundamental to enable alkaline water electrolysis for cost-effective H 2 generation. In this work, we have used a galvanostatic method to codeposit PtNi films onto polycrystalline gold. The surface concentrations of Ni (Γ Ni ) and Pt (Γ Pt ) were calculated from electrochemical measurements; the Γ Pt /Γ Ni ratio and electrocatalytic activity of these materials towards hydrogen evolution reaction (HER) in 1 M KOH show a strong dependence on the current density pulse applied during the electrodeposition. Analysis of the Tafel parameters hints that, on these deposits, HER proceeds through a Volmer-Heyrovsky mechanism. The galvanostatically deposited PtNi layers present a high current output per Pt gram, 3199 A g Pt À 1 , which is significantly larger compared to other PtNi-based materials obtained by more extended and more complex synthesis methods.

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Comparison of Electrocatalytic Hydrogen Evolution Properties of Ni-Co and Ni-Co-WC Porous Electrodes

Yang¹

2022

International Journal of Electrochemical Science

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The porous electrode of (Ni-Co)0 and (Ni-Co)30 for electrocatalytic hydrogen evolution were prepared by electroplating on a sponge Co based alloy Co69.9Ni30.1 matrix. Scanning electron microscope (SEM) and X-ray diffractometer (XRD) were used to characterize the surface images and the crystal structure of the electrodes, respectively. Polarization curves, electrochemical reaction AC impedance spectroscopy (EIS), cyclic voltammetry (CV) curves and amperometric i-t curves were used to compare their electrocatalysis for hydrogen evolution reaction (HER) in the dilute sulphuric acid solution with concentration of 0.5M. The surface of the composite coating (Ni-Co)30 is densely packed with coarse particles like peanut shell, which are agglomerated by a large number of tiny particles. The specific surface ratio of (Ni-Co)30 is higher than that of the (Ni-Co)0 coating. The structure of (Ni-Co)30 is a biphasic structure with WC dispersed in the Ni-Co solid solution. The results show that the HER overpotential, the electrochemical impedance and the apparent activating energy of the reaction of hydrogen evolution for the porous (Ni-Co)30 are lower than those of the porous (Ni-Co)0. When the temperature is 25-50℃, the exchange current density of HER for (Ni-Co)30 is 8.92-15.78 times greater than that of the porous (Ni-Co)0. The HER overpotential of (Ni-Co)30 at a current density of 10mA/cm 2 is 0.118V lower than that of (Ni-Co)0. The activation energy of the HER of the (Ni-Co)30 at the overpotential of 0.2V is 20kJ/mol smaller than that of the (Ni-Co)0. The (Ni-Co)30 has excellent oxidation resistance and super HER stability, as does the (Ni-Co)0. The electrocatalytic HER performance of the composite electrode (Ni-Co)30 is better than that of the (Ni-Co)0.

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NiMo Nanoparticles Electrodeposited by Pulsed Current and Their Catalytic Properties for Hydrogen Production

Cited by 3 publications

References 0 publications

Electrochemical Synthesis of Photoelectrodes and Catalysts for Use in Solar Water Splitting

Electrochemical Synthesis of Photoelectrodes and Catalysts for Use in Solar Water Splitting

Galvanostatically Deposited PtNi Thin‐Films as Electrocatalysts for the Hydrogen Evolution Reaction

Comparison of Electrocatalytic Hydrogen Evolution Properties of Ni-Co and Ni-Co-WC Porous Electrodes

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