Electrocatalysis of hydrogen evolution reaction on Pt electrode surface-modified by S-2 chemisorption

2007 ◽  
Vol 32 (5) ◽  
pp. 542-547 ◽  
Author(s):  
A.C.D. Angelo
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrode Surface ◽  
Pt Electrode ◽  
Surface Modified

Polyaniline Modified Surface of Electrode for Boosting the Electrocatalysis on Hydrogen Evolution Reaction and Ethanol Oxidation Reaction

2021 ◽  
Author(s):  
Yankun Huang ◽  
Feng Bao ◽  
Muwei Ji ◽  
Yanzhao Hu ◽  
Liu Huang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrode Surface ◽  
Oxidation Reaction ◽  
Ethanol Oxidation ◽  
Carbon Paper ◽  
Ethanol Oxidation Reaction ◽  
Pt Electrode ◽  
Modified Surface

Here, polyaniline (PANI) is reported loaded on carbon paper to modify the carbon paper-PANI-Pt electrode surface, tailoring the electrocatalytic capability on hydrogen evolution reaction and ethanol oxidation reaction. The reasons...

Enhanced catalytic activity of edge-exposed 1T phase WS2 grown directly on a WO3 nanohelical array for water splitting

2019 ◽  
Vol 7 (46) ◽  
pp. 26378-26384 ◽  
Author(s):  
Noho Lee ◽  
Il Yong Choi ◽  
Kyung-Yeon Doh ◽  
Jaewon Kim ◽  
Hyeji Sim ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Catalytic Performance ◽  
Surface Modified

A hierarchical electrode consisting of edge-exposed 1T phase WS2, grown on an array of surface-modified WO3 nanohelixes (NHs), and its enhanced catalytic performance in the hydrogen evolution reaction (HER) are presented.

scholarly journals CATHODIC HYDROGEN EVOLUTION ON COBALT MONOSILICIDE IN POTASSIUM HYDROXIDE SOLUTION

2017 ◽  
Vol 60 (10) ◽  
pp. 9
Author(s):  
Artyom Sh. Shamsutdinov ◽  
Anatoliy B. Shein
Keyword(s):  
Equivalent Circuit ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrode Surface ◽  
Potassium Hydroxide ◽  
Potassium Hydroxide Solution ◽  
Cobalt Silicide ◽  
Impedance Measurements ◽  
Hydroxide Solution ◽  
Impedance Data

The kinetics of hydrogen evolution reaction on cobalt monosilicide CoSi in potassium hydroxide solution was studied using methods of polarization and impedance measurements. Electrochemical impedance of CoSi was studied in 1 M KOH at 21-22 °C in the range of potentials of hydrogen evolution. Solutions were prepared from high-purity reagents and de-ionized water (Milli-Q). The working solutions were de-aerated with hydrogen (purity 99.999 %). Cobalt silicide was prepared from silicon (99.99 % purity) and electrolytic cobalt (99.98 % purity) by Czochralski method (pulling from the melt at speed of 0.4 mm/min). Electrodes were cut using electric-spark method. The working electrode surface was 0.4 – 0.6 cm2. Before measurements, the working electrode surface was abraded with emery papers of 1000 and 2000, cleaned with ethanol and washed in the working solution. Electrochemical measurements were carried out in three-electrode electrochemical cell with cathodic and anodic compartments separated with a porous glass diaphragm. Potentials Е were changed from low to high cathodic polarisations and vice versa. Before recording an impedance spectrum at each potential value, the electrode was polarised under potentiostatic conditions until constant value of current was reached. The electrode potentials are given with respect to the SHE. Impedance measurements were carried out using FRA Solartron and potentiostat Solartron 1280 (Solartron Analytical) in the frequency range from 10 kHz to 0.01 Hz (10 points per decade). The alternating signal amplitude was 10 mV. The CorrWare2, ZPlot2 and ZView2 software (Scribner Associates, Inc.) was used for measuring and processing the impedance data. In 1 М KOH polarization curve for CoSi-electrode has Tafel plot with the slope bk = 0.113 V. Earlier it was established that b for Со2Ѕі and CoSi2 at these conditions were 0.123 and 0.105 V, respectively, while b for Co was equal to 0.144 V. Tafel slope for cobalt monosilicide is less than Co, i.e. the difference between the current densities on the silicide and cobalt increases with increasing in cathodic polarization. At a constant electrode potential E, the current density i for CoSi is higher than for Co (at E = -1.2 V the value of i for CoSi is equal to 1.58 mA/cm2, and for Co i = 0.32 mA/cm2). Nyquist diagrams consist of the combination of capacitive semicircle at high frequencies and an inductive arc at low frequencies. Impedance spectra of cobalt silicide can not be accurately described by a simple equivalent circuit consisting of parallel-connected charge transfer resistance and the double layer capacitance. In order to describe the behavior of CoSi - electrode in 1 M KOH solution in the range of investigated potentials the equivalent circuit was used which was obtained in several works as a model of two-stage process with the adsorption of intermediate substances, in particular for hydrogen evolution reaction. In order to analyze the impedance data we used the diagnostic criteria for hydrogen evolution reaction mechanisms, based on the dependence of equivalent circuit elements on the overvoltage and OH- ions concentration, which were previously proposed. Determination of the kinetic parameters (rate constants and transfer coefficients) of hydrogen evolution reaction steps on the basis of the impedance data has been considered. Hydrogen evolution reaction on CoSi electrode in alkaline solution is discussed using the proposed criteria. It has been shown that hydrogen evolution reaction on CoSi in potassium hydroxide solution proceeds through the Volmer-Heyrovsky route with Heyrovsky reaction as the rate-determining and with the Langmuir isotherm for hydrogen adsorption. Forcitation:Shamsutdinov A.Sh., Shein A.B. Cathodic hydrogen evolution on cobalt monosilicide in potassium hydroxide solution. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 10. P. 9-15

scholarly journals A Detrimental Effect of Acetonitrile on the Kinetics of Underpotentially Deposited Hydrogen and Hydrogen Evolution Reaction, Examined on Pt Electrode in H2SO4 and NaOH Solutions

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 625 ◽  
Author(s):  
Tomasz Mikolajczyk ◽  
Mateusz Luba ◽  
Boguslaw Pierozynski ◽  
Lech Smoczynski
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Charge Transfer Resistance ◽  
Pt Electrode ◽  
Transfer Resistance ◽  
Electrode Surfaces ◽  
Tafel Polarization ◽  
Alkaline Electrolytes ◽  
Kinetics Of ◽  
Underpotentially Deposited

The present paper reports AC impedance spectroscopic/Tafel polarization and cyclic voltammetry study on the influence of acetonitrile concentration on the kinetics of UPD of H (underpotential deposition of hydrogen) and HER (hydrogen evolution reaction), examined on polycrystalline and polyoriented single-crystal sphere Pt electrode surfaces in 0.5 M H2SO4 and 0.1 M NaOH supporting solutions. The resulted data provided confirmation of the destructive role of Pt surface-electrosorbed acetonitrile on the kinetics of underpotentially deposited hydrogen, as well as cathodic hydrogen evolution reaction. The above was exclusively elucidated through evaluation of the associated charge-transfer resistance and capacitance (and complementary exchange current-density and Tafel slope) parameters, derived comparatively on Pt for pure and acetonitrile-modified acidic and alkaline electrolytes.

MOF-derived surface modified Ni nanoparticles as an efficient catalyst for the hydrogen evolution reaction

2015 ◽  
Vol 3 (32) ◽  
pp. 16435-16439 ◽  
Author(s):  
Teng Wang ◽  
Qianyu Zhou ◽  
Xiaojuan Wang ◽  
Jie Zheng ◽  
Xingguo Li
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Ni Nanoparticles ◽  
Efficient Catalyst ◽  
Thin Carbon ◽  
Metal Organic ◽  
Coating Layers ◽  
Surface Modified

Pyrolysis of a Ni based metal organic framework in NH3yields Ni nanoparticles with surface nitridation together with thin carbon coating layers. The subtle surface modification significantly improves the catalytic performance for the hydrogen evolution reaction (HER).

Characterization of Rh:SrTiO3 photoelectrodes surface-modified with a cobalt clathrochelate and their application to the hydrogen evolution reaction

2017 ◽  
Vol 258 ◽  
pp. 255-265 ◽  
Author(s):  
Manuel Antuch ◽  
Pierre Millet ◽  
Akihide Iwase ◽  
Akihiko Kudo ◽  
Sergey A. Grigoriev ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Modified
Sign in / Sign up

Export Citation Format

Share Document