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Journal Science Intensive Technologies №12 for 2013 г.
Article in number:
Influence of nature of substituent in molecule in number of additives - guanidine, phenylbiguanidine, o-fluorophenylbiguanidine - on hydrogen evolution reaction kinetics on iron in acidic chloride media
Keywords:
hydrogen evolution reaction
iron
chloride media
guanidine
phenylbiguanidine
o-fluorophenylbiguanidine
kinetic parameters
slow stage
Authors:
D.V. Balybin - Ph.D.(Chem.), Senior Lecturer, Tambov State University a.n. G.R. Derzhavin
V.I. Vigdorovich - Dr.Sc.(Chem.), Professor, Tambov State University a.n. G.R. Derzhavin. E-mail: vits21@mail.ru
L.E. Tsygankova - Dr.Sc.(Chem.), Professor, Tambov State University a.n. G.R. Derzhavin
O.Yu. Kuzina - Master Student, Tambov State University a.n. G.R. Derzhavin
D.V. Krylskii - Dr.Sc.(Chem.), Tambov State University a.n. G.R. Derzhavin
V.I. Vigdorovich - Dr.Sc.(Chem.), Professor, Tambov State University a.n. G.R. Derzhavin. E-mail: vits21@mail.ru
L.E. Tsygankova - Dr.Sc.(Chem.), Professor, Tambov State University a.n. G.R. Derzhavin
O.Yu. Kuzina - Master Student, Tambov State University a.n. G.R. Derzhavin
D.V. Krylskii - Dr.Sc.(Chem.), Tambov State University a.n. G.R. Derzhavin
Abstract:
Hydrogen evolution reaction on iron in background solutions of x M HCl + (1-x) M LiCl proceeds with slow discharge
H+solv + e → Hads + solvent
Insertion of guanidine in 0.5-10 mM concentration does not alter the limiting step nature. It is suggested that Hads coverage does not exceed 0.1. Addition of 0.5 mM phenylbiguanidine induces replacement of the slow discharge by limiting recombination
Hads + Hads → H2
that, in turn, is replaced by slow surface diffusion with growth of concentration up to 10 mM
Hads → diffusion along surface
Influence of o-fluorophenylbiguanidine is similar in whole. Observed regularities are explained in terms of difference in structure of the additives molecules.
Pages: 36-42
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