Open AccessThe effect of organic molecules adsorption on hydrogen absorption in relation to the hydrogen evolution reaction
Author(s) -
Lj.M. Vračar
Publication year - 2001
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc0112799v
Subject(s) - adsorption , molecule , hydrogen , absorption (acoustics) , chemistry , organic molecules , inorganic chemistry , alloy , electrode , photochemistry , materials science , organic chemistry , composite material
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.