Table 1. Elemental Analysis, Metal Amount, and BET Surface Area.

samples	% C	% H	% N	%O	M-content (%)a	SBET (m2g–1)	Vtot (cm3 g–1)
GO	54.4	1.9	0.1	43.6		70
TrGO600	83.9	0.3	0.1	15.7		282	0.572
TrGO1000	90.8	0.4	0.1	8.7		373	0.725
TrGO600-Co	71.84	0.48	0.41	27.3	9.0 ± 3	147	0.264
TrGO1000-Co	72.93	0.65	0.42	26.0	9.0 ± 1	134	0.268
TrGO600-Ni	63.94	0.61	0.71	34.74	12 ± 2	186	0.327
TrGO1000-Ni	72.9	0.54	0.61	25.95	8.0 ± 2	138	0.231

^aCalculated by atomic absorption; S_BET = BET surface area; V_tot = total pore volume.