scholarly journals Mechanistic Origins of the pH Dependency in Au-Catalyzed Glycerol Electro-oxidation: Insight from First-Principles Calculations

ACS Catalysis ◽  
2021 ◽  
pp. 662-675
Author(s):  
Anand M. Verma ◽  
Laura Laverdure ◽  
Marko M. Melander ◽  
Karoliina Honkala
Keyword(s):  
First Principles ◽  
First Principles Calculations ◽  
Ph Dependency ◽  
Electro Oxidation

scholarly journals On the Mechanistic Origins of the pH-Dependency in Au-Catalyzed Glycerol Electro-Oxidation: Insight from First Principles Calculations

2021 ◽  
Author(s):  
Anand Mohan Verma ◽  
Marko Melander ◽  
Karoliina Honkala
Keyword(s):  
First Principles ◽  
Computational Study ◽  
Decisive Role ◽  
Computational Studies ◽  
First Principles Calculations ◽  
Oxidation Reactions ◽  
Oh Groups ◽  
Ph Dependency ◽  
Alkaline Conditions ◽  
Electro Oxidation

We have performed a comprehensive computational study to understand and explain the experimentally observed pH- and potential-dependency of alkaline electro-oxidation of glycerol on gold. It is shown that the adsorbed OH groups have a decisive role on the reaction mechanism, thermodynamics, and kinetics. Overall, our findings highlight that computational studies should explicitly account for pH and coverage effects under alkaline conditions for electrocatalytic oxidation reactions to reliably predict electrocatalytic behaviour.

scholarly journals On the Mechanistic Origins of the pH-Dependency in Au-Catalyzed Glycerol Electro-Oxidation: Insight from First Principles Calculations

2021 ◽  
Author(s):  
Anand Mohan Verma ◽  
Marko Melander ◽  
Karoliina Honkala
Keyword(s):  
First Principles ◽  
Computational Study ◽  
Decisive Role ◽  
Computational Studies ◽  
First Principles Calculations ◽  
Oxidation Reactions ◽  
Oh Groups ◽  
Ph Dependency ◽  
Alkaline Conditions ◽  
Electro Oxidation

We have performed a comprehensive computational study to understand and explain the experimentally observed pH- and potential-dependency of alkaline electro-oxidation of glycerol on gold. It is shown that the adsorbed OH groups have a decisive role on the reaction mechanism, thermodynamics, and kinetics. Overall, our findings highlight that computational studies should explicitly account for pH and coverage effects under alkaline conditions for electrocatalytic oxidation reactions to reliably predict electrocatalytic behaviour.

Electronic Structure and X-ray Absorption Spectra of Rutile TiO2 Using First-Principles Calculations

2014 ◽  
Vol 52 (12) ◽  
pp. 1025-1029
Author(s):  
Min-Wook Oh ◽  
Tae-Gu Kang ◽  
Byungki Ryu ◽  
Ji Eun Lee ◽  
Sung-Jae Joo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
First Principles ◽  
First Principles Calculations ◽  
Rutile Tio2 ◽  
X Ray ◽  
X Ray Absorption

To Bend or Not to Bend, the Dilemma of Multiple Bonds

2019 ◽  
Author(s):  
Michele Pizzocchero ◽  
Matteo Bonfanti ◽  
Rocco Martinazzo
Keyword(s):  
First Principles ◽  
2D Materials ◽  
Main Group ◽  
First Principles Calculations ◽  
Group 14 ◽  
Multiple Bonds ◽  
Main Group Elements ◽  
Structural Distortions

The manuscript addresses the issue of the structural distortions occurring at multiple bonds between high main group elements, focusing on group 14. These distortions are known as trans-bending in silenes, disilenes and higher group analogues, and buckling in 2D materials likes silicene and germanene. A simple but correlated \sigma + \pi model is developed and validated with first-principles calculations, and used to explain the different behaviour of second- and higher- row elements.

Thermodynamic Stability of Hexagonal and Rhombohedral Bn at Cvd Conditions from Van der Waals Corrected First Principles Calculations

2019 ◽  
Author(s):  
Henrik Pedersen ◽  
Björn Alling ◽  
Hans Högberg ◽  
Annop Ektarawong
Keyword(s):  
Thin Films ◽  
Thermodynamic Stability ◽  
First Principles ◽  
Thermal Equilibrium ◽  
Density Functional ◽  
Van Der Waals ◽  
Chemical Vapor ◽  
First Principles Calculations ◽  
Functional Theory ◽  
The Stability

Thin films of boron nitride (BN), particularly the sp<sup>2</sup>-hybridized polytypes hexagonal BN (h-BN) and rhombohedral BN (r-BN) are interesting for several electronic applications given band gaps in the UV. They are typically deposited close to thermal equilibrium by chemical vapor deposition (CVD) at temperatures and pressures in the regions 1400-1800 K and 1000-10000 Pa, respectively. In this letter, we use van der Waals corrected density functional theory and thermodynamic stability calculations to determine the stability of r-BN and compare it to that of h-BN as well as to cubic BN and wurtzitic BN. We find that r-BN is the stable sp<sup>2</sup>-hybridized phase at CVD conditions, while h-BN is metastable. Thus, our calculations suggest that thin films of h-BN must be deposited far from thermal equilibrium.

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