Study of the kinetics and mechanism of the hydrogen evolution reaction on CeMe₂Ge₂ electrodes (Me = Fe, Co, Ni)

Chem. Met. Alloys 6 (2013) 113-120

https://doi.org/10.30970/cma6.0245

A.B. SHEIN, V.I. KICHIGIN, M. KONYK, L. ROMAKA, Yu. STADNYK

The hydrogen evolution reaction on the CeMe₂Ge₂ (Me = Fe, Co, Ni) germanides in х М H₂SO₄ + (0.5-x) M Na₂SO₄ (x = 0.05-0.5) solutions has been studied using polarization and impedance measurements. The conclusion has been made that hydrogen evolution on the investigated materials occurs by the Volmer-Tafel mechanism for a logarithmic isotherm of adsorption of atomic hydrogen.

Polarization curves in х М H₂SO₄ + (0.5-x) M Na₂SO₄ solutions.

1 – CeFe₂Ge₂; 2 – CeСо₂Ge₂; 3-5 – CeNi₂Ge₂. For curves 1-3: x = 0.5, for 4: x = 0.15, for 5: x = 0.05.

Keywords

Intermetallic compound / Hydrogen evolution reaction / Hydrogen adsorption / Acidic solution / Impedance