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Influence of pyridine on hydrogen evolution reaction kinetics on iron in acidic chloride solutions
Kinetics of hydrogen evolution reaction (HER) on iron is stu-died in aqueous HC1 solutions with constant ionic strength, equal to 1 in pyridine presence Insertion of 0.5 mM C5H5N into back-ground solution induces change of slow discharge by limiting surface diffusion which remains the rate-determining step (rds) at subsequent twofold increase of Cpyridine. With further increase of Cpyridine up to 5 mM the recombination step becomes rds, but pres-ence of 10 mM additive again leads to the HER kinetic parameters corresponding to slow discharge. Rate of solid phase diffusion through the steel membrane (St3) does not depend of limiting step of HER.
iron; hydrogen ions; water; discharge; kinetics; slow step; pyridine; concentration; surface diffusion
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Section 1. KINETICS OF ELECTRODE PROCESSES
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