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1 Polish Journal of Chemistry

1 2004

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Composite Ni-P=TiO2 Electrocoatings for Hydrogen Evolution Reaction in Alkaline Solutions

Łosiewicz B., Budniok A., Lasia A., Łągiewka E.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1457-1476

Hydrogen evolution reaction (HER) has been studied in alkaline media using three types of electrodes: (i) electrocoated with Ni-P + TiO2, (ii) electrocoated with Ni-P + TiO2 and heated at 400_C, ( iii) electrocoated with Ni-P + TiO2 and heated at 500_C. The heating was carried out in argon atmosphere. Topographical and structural changes of Ni-P + TiO2 coatings before and after heating were investigated applying geometric surface structure (GSS) and X-ray diffraction (XRD) methods. GSS results were presented graphically in 2 and 3 dimensions. Steady-state polarization and ac impedance spectroscopy were used to determine electrode activities. HER proceeded viaVolmer-Heyrovský mechanism. The effectiveness of HER depended on the intrinsic activity. HER was enhanced when heating was applied, due to the increased amount of non-stoichiometric Ti oxides (facilitating H reduction/adsorption), comparing to the unheated Ni-P + TiO2 electrode. The most efficient HER proceeded under the following conditions: 5 MKOH, 25_C, Ni-P + TiO2 electrode heated to 500_C.