Proton-coupled electron transfer kinetics for the hydrogen evolution reaction of hangman porphyrins

2012 ◽  
Vol 5 (7) ◽  
pp. 7737 ◽  
Author(s):  
Manolis M. Roubelakis ◽  
D. Kwabena Bediako ◽  
Dilek K. Dogutan ◽  
Daniel G. Nocera
Keyword(s):  
Electron Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Electron Transfer Kinetics ◽  
Proton Coupled Electron Transfer

scholarly journals Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins

2014 ◽  
Vol 111 (42) ◽  
pp. 15001-15006 ◽  
Author(s):  
D. Kwabena Bediako ◽  
Brian H. Solis ◽  
Dilek K. Dogutan ◽  
Manolis M. Roubelakis ◽  
Andrew G. Maher ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Proton Coupled Electron Transfer

scholarly journals Atoms vs. Ions: Intermediates in Reversible Electrochemical Hydrogen Evolution Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1135
Author(s):  
Jurga Juodkazytė ◽  
Kȩstutis Juodkazis ◽  
Saulius Juodkazis
Keyword(s):  
Electron Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Ionic Species ◽  
Absolute Temperature ◽  
Main Reaction ◽  
Adsorbed Hydrogen ◽  
H2 Evolution ◽  
Hydrogen Electrode ◽  
Reported Data

We present a critical analysis of the mechanism of reversible hydrogen evolution reaction based on thermodynamics of hydrogen processes considering atomic and ionic species as intermediates. Clear distinction between molecular hydrogen evolution/oxidation (H2ER and H2OR) and atomic hydrogen evolution/oxidation (HER and HOR) reactions is made. It is suggested that the main reaction describing reversible H2ER and H2OR in acidic and basic solutions is: H3O++2e−⇌(H2+)adH2+OH− and its standard potential is E0 = −0.413 V (vs. standard hydrogen electrode, SHE). We analyse experimentally reported data with models which provide a quantitative match (R.J.Kriek et al., Electrochem. Sci. Adv. e2100041 (2021)). Presented analysis implies that reversible H2 evolution is a two-electron transfer process which proceeds via the stage of adsorbed hydrogen molecular ion H2+ as intermediate, rather than Had as postulated in the Volmer-Heyrovsky-Tafel mechanism. We demonstrate that in theory, two slopes of potential vs. lg(current) plots are feasible in the discussed reversible region of H2 evolution: 2.3RT/F≈60 mV and 2.3RT/2F≈30 mV, which is corroborated by the results of electrocatalytic hydrogen evolution studies reported in the literature. Upon transition to irreversible H2ER, slowdown of H2+ formation in the first electron transfer stage manifests, and the slope increases to 2.3RT/0.5F≈120 mV; R,F,T are the universal gas, Faraday constants and absolute temperature, respectively.

PbTe quantum dots as electron transfer intermediates for the enhanced hydrogen evolution reaction of amorphous MoSx/TiO2 nanotube arrays

Nanoscale ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 10288-10295 ◽  
Author(s):  
Shiyuan Gao ◽  
Bin Wang ◽  
Xinyu Liu ◽  
Zhanhu Guo ◽  
Zhongqing Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays

PbTe quantum dots (QDs) function as electron transfer intermediates for higher electrocatalytic performances from MoSx/PbTe QDs/TNAs.

Hierarchical nickel-vanadium nanohybrid with strong electron transfer for accelerated hydrogen evolution reaction

2020 ◽  
Vol 528 ◽  
pp. 146982
Author(s):  
Jiangnan Liu ◽  
Jingsong Cui ◽  
Jianhang Sun ◽  
Hui Liu ◽  
Wei Li ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Strong Electron
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