Electrode For Hydrogen Evolution Reaction Research Articles

Electrocatalytic properties of Ti 2Ni/Ni-Mo composite electrodes for hydrogen evolution reaction

A composite electrode as hydrogen cathodes composed of Ti 2Ni hydrogen absorbing alloys and a Ni-Mo electrocatalyst was prepared for alkaline water electrolysis. The electrocatalytic properties of hydrogen evolution reaction (HER) are carried out in a 30 wt% KOH solution at 70 °C. The surface morphology and chemical composition of the cathode were also examined. The experimental results show that the composite cathode has a low hydrogen overpotential (ca. 60 mV at 70 °C in 30 wt% KOH) and excellent stability under conditions of continuous electrolysis and intermittent electrolysis with power interruption shutdown. The stability mechanism of the cathode against intermittent electrolysis is discussed.

Electrochemical characterization of graphite composite-coated electrodes for hydrogen evolution reaction

Composite materials with a metallic matrix were prepared from a graphite powder intercalated with various metals (Pd, Pt, Rh) by electrocodeposition in aqueous solutions of dissolved nickel or copper. The graphite particles held in suspension were codeposited with the metal during the electrodeposition. The materials were used as electrodes for the hydrogen evolution reaction and characterized by galvanostatic polarization, AC impedance, and SEM techniques. It is observed that the effect of the codeposited particles on the hydrogen evolution reaction is strongly related to the nature of the metallic matrix surrounding the particles.

Study on the Catalytic Property of Ni-WC Composite Electrode for Hydrogen Evolution Reaction in Weak Acidic Medium

Study on the Catalytic Property of Ni-WC Composite Electrode for Hydrogen Evolution Reaction in Weak Acidic Medium

Composite-coating electrodes for hydrogen evolution reaction

The Ni, Co and Fe composite-coatings were prepared by electrolytic composite-deposition. The characterizations for the hydrogen evolution reaction (HER) were carried out in a 5 M KOH solution. Polarization and impedance measurements have shown that the composite-coating is catalytically more active than the Ni electrode. Overpotential on the Fe composite-coating electrode measured at 100 mA cm −2 are 250 mV less than that on the Ni electrode. ac impedance measurements indicate that high electrocatylitic activities on the composite-coating electrodes are resulted from larger real surface areas on the electrode.

Electrocatalytic properties of amorphous nickel boride electrodes for hydrogen evolution reaction in alkaline solution

The hydrogen evolution reaction (HER) was investigated in 1 M NaOH at 70°C by steady-state polarization, and by the a.c. impedance techniques on amorphous nickel boride and nickel boride + nickel powder electrodes obtained by pressing the appropriate powders at room temperature. The influence of electrode composition on the activity was studied. The best catalytic properties were observed for an electrode composed of 10 wt.% of Ni and 90 wt.% of nickel boride. It was found that the electrodes became more catalytic for the HER after electrochemical oxidation. The hydrogen evolution reaction proceeds via the Volmer-Heyrovsky mechanism and the kinetic parameters of the process were determined. The structure and morphology of the electrodes were studied using X-ray diffraction and scanning electron microscopy.

Surface Chemistry and Electrocatalytic Activity of the HER on Nickel Modified with Heteropolyacids

Nickel was modified at the surface from dilute acid solution containing different concentrations of ,, or . It was shown that improvement in the over potential (η)) and in the exchange current density of the hydrogen evolution reaction (HER) in 3M on the electrode depends on the nature of the heteropolyacid of the modification bath. The best electrocatalytic parameters were obtained on electrodes modified with . The surface chemical composition of the electrode was determined by x‐ray photoelectron spectroscopy. The HER electrocatalytic activities of the modified electrodes were correlated to their surface chemical composition. The products of the modified electrodes have been identified before and after using the electrodes for HER in alkaline medium.