scholarly journals The effect of organic molecules adsorption on hydrogen absorption in relation to the hydrogen evolution reaction

2001 ◽  
Vol 66 (11-12) ◽  
pp. 799-809 ◽  
Author(s):  
Ljiljana Vracar
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Hydrogen Absorption ◽  
Organic Molecules ◽  
Competitive Adsorption ◽  
Electronic Effects ◽  
Adsorbed Species ◽  
Adsorption Of Organic Molecules ◽  
Electrode Coverage ◽  
Electrodeposited Alloy

The competitive adsorption of organic molecules (2,7-naphthalenedisulfonic acid) and adsorbed His of interest in relation to its influence on H absorption into a Pd-Ni electrodeposited alloy. The experimental results, in acid solution, show an enhancement of the coverage of the electrode surface with adsorbed H due to the competitive adsorption of organic molecules that interfere with H atoms, through lateral attractive interactions between the adsorbed species and communal electronic effects, leading supposedly to a decreased probability of H entry into the alloy. Chemisorbed H is, on the other hand, an intermediate in the HER, so the enhancement of the electrode coverage in the presence of co-adsorbed organic molecules promotes the hydrogen evolution reaction.

scholarly journals Competitive Adsorption of Organic Molecules on Clay Rock

2017 ◽  
Vol 17 ◽  
pp. 144-147 ◽  
Author(s):  
Romain V.H. Dagnelie ◽  
Sabrina Rasamimanana ◽  
Emilie Thory ◽  
Gregory Lefèvre
Keyword(s):  
Organic Molecules ◽  
Competitive Adsorption ◽  
Clay Rock ◽  
Adsorption Of Organic Molecules

Theory of electrochemical impedance of surface reactions: second-harmonic and large-amplitude response

1997 ◽  
Vol 75 (11) ◽  
pp. 1508-1517 ◽  
Author(s):  
David A. Harrington
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electrochemical Impedance ◽  
Second Harmonic ◽  
Surface Reactions ◽  
Nonlinear Effects ◽  
Amplitude Dependence ◽  
Adsorbed Species ◽  
Amplitude Response ◽  
Potential Perturbation

The theory for the electrochemical impedance of surface reactions involving a single adsorbed species is presented. A new methodology is used, in which many harmonics are considered, and the differential equations are reduced to algebraic matrix equations. The amplitude of the ac potential perturbation is not assumed to be small, and nonlinear effects are taken into account. The amplitude dependence of the impedance and the second-harmonic response are investigated. The quasi-reversible electrosorption reaction and the hydrogen evolution reaction are considered in detail, assuming that the adsorbed species obeys the Langmuir isotherm. Keywords: electrochemistry, impedance, adsorption, hydrogen evolution reaction, second harmonic.

The cobalt corrole catalyzed hydrogen evolution reaction: surprising electronic effects and characterization of key reaction intermediates

2014 ◽  
Vol 50 (21) ◽  
pp. 2725-2727 ◽  
Author(s):  
Atif Mahammed ◽  
Biswajit Mondal ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
Zeev Gross
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Reaction Intermediates ◽  
Electronic Effects ◽  
Surprising Effect

The proton-activating intermediate in the cobalt corrole catalyzed hydrogen evolution reaction was characterized and a surprising effect of macrocycle halogenation was uncovered.

scholarly journals System Theoretical Study on the Effect of Variable Nonmetallic Doping on Improving Catalytic Activity of 2D-Ti3C2O2 for Hydrogen Evolution Reaction

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2497
Author(s):  
Ye Su ◽  
Minhui Song ◽  
Xiaoxu Wang ◽  
Jihang Jiang ◽  
Xiaolong Si ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Hydrogen Absorption ◽  
Density Functional ◽  
Electronic Conductivity ◽  
Dft Method ◽  
Catalytic Performance ◽  
P Element ◽  
Element Doping

2D MXenes have been found to be one of the most promising catalysts for hydrogen evolution reaction (HER) due to their excellent electronic conductivity, hydrophilic nature, porosity and stability. Nonmetallic (NM) element doping is an effective approach to enhance the HER catalytic performance. By using the density functional theory (DFT) method, we researched the effect of nonmetallic doping (different element types, variable doping concentrations) and optimal hydrogen absorption concentration on the surface of NM-Ti3C2O2 for HER catalytic activity and stability. The calculation results show that doping nonmetallic elements can improve their HER catalytic properties; the P element dopants catalyst especially exhibits remarkable HER performance (∆GH = 0.008 eV when the P element doping concentration is 100% and the hydrogen absorption is 75%). The origin mechanism of the regulation of doping on stability and catalytic activity was analyzed by electronic structures. The results of this work proved that by controlling the doping elements and their concentrations we can tune the catalytic activity, which will accelerate the further research of HER catalysts.

Sign in / Sign up

Export Citation Format

Share Document