Détermination du mécanisme de dégagement d'hydrogène sur le niobium en milieu alcalin

1977 ◽  
Vol 55 (3) ◽  
pp. 375-379 ◽  
Author(s):  
Cherubala P. Vijayan ◽  
Dominique-Louis Piron
Keyword(s):  
Reaction Mechanism ◽  
Standard Deviation ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Reaction Order ◽  
Alkaline Media ◽  
Tafel Slopes

The mechanism of the hydrogen evolution reaction on niobium is evaluated in alkaline media at 24 °C. The reaction order of zero, along with the observed Tafel slopes of 120 mV/decade (standard deviation 8 mV/dec.), indicate the Heyrovsky reaction mechanism to be applicable for the hydrogen evolution reaction. The presence of anions such as sulfate and chloride does not influence the mechanism.

Electrochemical Behavior of Ni-based Alloys for Hydrogen Evolution Reaction in Alkaline Media

2012 ◽  
Vol 15 (3) ◽  
pp. 211-214
Author(s):  
Liliana Vazquez-Nava ◽  
Karina Patlán-Olmedo ◽  
Miguel A. Oliver-Tolentino ◽  
Rosa Gonzalez-Huerta ◽  
Hector J. Dorantes-Rosales ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Open Circuit Potential ◽  
Linear Sweep Voltammetry ◽  
High Energy ◽  
Open Circuit ◽  
Alkaline Media ◽  
Tafel Slopes ◽  
Alkaline Conditions ◽  
Proton Adsorption

*Nickel-based alloys (Ni0.8CoO0.1Zn0.05MnO0.02Ti0.01Y0.01Al0.01(M1), NiO0.8CoO0.1Zn0.05MnO0.02Ti0.01Y0.01Al0.01 (M2) and NiO0.6CoO0.35Zn0.025Ti0.025 (M3)) were synthesized from high purity powders by means of high-energy mechanical milling. The hydrogen evolution reaction (HER) kinetic-performance of the as-prepared materials was evaluated using linear sweep voltammetry at alkaline conditions and room temperature. According to kinetic parameters calculated from Tafel slopes, the sample M2 showed the better activity in the HER. These results suggest that the electrode surface state in the material play an important role in the proton-adsorption kinetic as demonstrated by SEM, open circuit potential transients and cyclic voltammetry techniques.

scholarly journals Preparation of Robust Hydrogen Evolution Reaction Electrocatalyst WC/C by Molten Salt

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1621
Author(s):  
Pengpeng Yan ◽  
Yuchen Wu ◽  
Xiaofeng Wei ◽  
Xuewei Zhu ◽  
Wei Su
Keyword(s):  
Molten Salt ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Low Cost ◽  
Alkaline Media ◽  
Synthetic Approach ◽  
Highly Active ◽  
Tafel Slopes ◽  
One Step ◽  
A Current

Tungsten carbide (WC) is an alternative to the costly and resource-constrained Pt-based catalysts for hydrogen evolution reaction (HER). In this work, a one-step facile and easily scalable approach is reported, to synthesize ultrafine WC by molten salt. Benefiting from the ideal synergistic catalytic effect between the highly active WC nanoparticles and the conductive graphitic carbon, and strong charge transfer ability, the unique WC/C hybrids demonstrated excellent HER performance in both acid and alkaline medias with overpotentials of 112 and 122 mV, at a current density of 10 mA cm−2 and Tafel slopes of 54.4 and 68.8 mV dec−1, in acid and alkaline media, and remarkable stability. With the simplicity and low-cost of the synthetic approach, the strategy presented here can be extendable to the preparation of other transition metal-based/carbon hybrids for versatile applications.

Surface Strain Engineered Ni-NiO for Boosting Hydrogen Evolution Reaction in Alkaline Media

2021 ◽  
pp. 138985
Author(s):  
Xuerui Yi ◽  
Xiaobo He ◽  
Fengxiang Yin ◽  
Guoru Li ◽  
Zhichun Li
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Surface Strain ◽  
Alkaline Media

Nickel-based electrodes as catalysts for hydrogen evolution reaction in alkaline media

Ionics ◽  
2017 ◽  
Vol 24 (4) ◽  
pp. 1121-1127 ◽  
Author(s):  
Yanbing Zhu ◽  
Tao Liu ◽  
Liming Li ◽  
Shili Song ◽  
Rui Ding
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Alkaline Media ◽  
Nickel Based Electrodes
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