Designing Carbon/Oxygen Ratios of Graphene Oxide Membranes for Proton Exchange Membrane Fuel Cells

Table 1

Area of each bonding peak in three types of GO, obtained via integration (%).

Fitted XPS area (%)		GO (1.5)	GO (2.1)	GO (3.5)
Carbon species	C-C/C-H	9.0	15.4	36.4
sp^2-hybridized carbon	C=C	8.4	10.8	15.1
Oxygen-containing groups	C-OH	12.0	14.2	14.3
	C-O-C	37.8	47.0	27.2
	C=O	16.9	9.9	5.8
	O-C=O	15.9	2.7	1.2
	Sum	82.6	73.8	48.5