Table 1.

Contents of Pd(0) and Pd(2+) measured by XPS, Fig. 4, at the surface of PdO/Pd/Au/Ti/SiO₂/Si electrodes after electrochemical deposition of Pd layer, thermal treatment at 150 °C during 4 h and acid (0.1 M HCl) or basic (0.1 M NaOH) treatment during 12 h.

	Pd 3p		Pd 3d
	Pd(0) [%]	Pd(2+) [%]	Pd(0) [%]	Pd(2+) [%]
EC deposition	92	8	63	37
thermal treatment	9	91	10	90
basic treatment	8	92	9	91
acid treatment	30	70	34	66