Fabrication of CuO_x-Pd Nanocatalyst Supported on a Glassy Carbon Electrode for Enhanced Formic Acid Electro-Oxidation

Table 1

Variation of the surface coverage (Г) of CuO_xNWs electrodeposited onto Pd/GC electrode with deposition time and its effect on I_p of FAO.

Dep. time (min)	Real surface area (S)^a (cm^2) CuOx/Pd/GC	(Г%)^b	Ip (mA·cm^−2)
0	0.49	0	4.5
1	0.38	22	5.2
2	0.25	49	6.5
3	0.17	65	5.9
4	0.10	80	5.4

^aAs estimated from the charge consumed during the reduction of the surface oxide monolayer in 0.5 M H₂SO₄ using a reported value of 420 µC·cm⁻². ^bThe values of surface coverage (Г = 1 − S_modified/S_unmodified) were calculated for the various CuO_x/Pd/GC electrodes. S_modified and S_unmodified refer to the real surface area of the modified and the unmodified Pd/GC electrodes, respectively.