Table 1. Elemental Content of Catalysts.

catalyst	Cu elemental content (wt %)	Co elemental content (wt %)	Co/Cu molar ratio (%)
Cu@C-750	67.3	0
Co5-Cu@C	70.8	0.19	0.25
Co10-Cu@C	67.8	0.38	0.52
Co20-Cu@C	65.7	0.67	0.94
Co30-Cu@C	62.2	0.83	1.23
Co40-Cu@C	62.3	1.15	1.70