Reversible hydrogen evolution and oxidation mediated by molecular ion

Kęstutis Juodkazis; Jurga Juodkazytė; Benjaminas Šebeka; Saulius Juodkazis

doi:10.1117/12.2023294

16 September 2013 Reversible hydrogen evolution and oxidation mediated by molecular ion

Kęstutis Juodkazis, Jurga Juodkazytė, Benjaminas Šebeka, Saulius Juodkazis

Proceedings Volume 8822, Solar Hydrogen and Nanotechnology VIII; 88220S (2013) https://doi.org/10.1117/12.2023294
Event: SPIE Solar Energy + Technology, 2013, San Diego, California, United States

Abstract

The paper revisits the mechanism of reversible hydrogen evolution and oxidation reactions (HER and HOR) based on detailed thermodynamic analysis and survey of recent literature data. An assumption about the participation of adsorbed hydrogen atoms as intermediates in these processes, which was made about half a century ago and cannot account for a number of recent experimental observations, is critically analyzed. We propose that adsorbed molecular ion (H+ 2 )ad acts as intermediate in HER and HOR reactions described by the overall reversible process as follows: 2H3O+ + 2e (H+2 )ad H2" + 2H2O. New insights into the surface electrochemical processes taking place on Pt electrode at E ERHE (RHE { reference hydrogen electrode) as well as electrocatalysis of HER at E < ERHE, i.e. under overvoltage conditions, are obtained. The presented concept explains quantitatively the HER and HOR phenomena observed experimentally.

Citation Download Citation

Kęstutis Juodkazis, Jurga Juodkazytė, Benjaminas Šebeka, and Saulius Juodkazis "Reversible hydrogen evolution and oxidation mediated by molecular ion", Proc. SPIE 8822, Solar Hydrogen and Nanotechnology VIII, 88220S (16 September 2013); https://doi.org/10.1117/12.2023294

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available