Spillover Phenomena and Its Striking Impacts in Electrocatalysis for Hydrogen and Oxygen Electrode Reactions

Table 2

(a) Percentage contribution of each Pt 4f component to the total peak area for freshly prepared specimens. (b) The same for an annual storage of the same specimens.

(a)

	Percentage contribution of Pt 4f components
Catalyst support	Pt^0	Pt(OH)	PtOx
	(71.1 eV)	(72.7 eV)	(74.8 eV)
Nb2O5	67.2%	23.7%	9.1%
Nb2O5-TiO2	65.3%	34.7%	—
WO3- TiO2	61.9%	26.7%	11.4%
TiO2	56.8%	31.9%	11.3%

(b)

	Percentage contribution of Pt 4f components
Catalyst support	Pt^0	Pt(OH)x	PtOx
	(71.1 eV)	(72.7 eV)	(74.8 eV)
Nb2O5	58.3%	25.6%	16.1%
Nb2O5-TiO2	63.6%	29.5%	6.9%
WO3- TiO2	61.9%	26.7%	11.4%
TiO2	56.8%	31.9%	11.3%