Table 1.

EDS for G-Ni and G-NiO electrodes.

Electrode	Element	Weight %	Atom %	Net intensity	K ratio
G-Ni	C K	59.46	88.26	1,113.58	0.3414
	Ni K	37.27	11.32	584.67	0.2836
G-NiO	C K	18.22	30.49	20.63	0.0669
	O K	45.44	57.07	112.94	0.2196
	N K	36.34	12.44	23.16	0.3100