Table 2.

Cost evaluation of each cathode material for the production of 1 W of energy.

Cathodes Material	Power densitya	Area needed for 1 W	Loading	Quantity AC for 1 W	Quantity binder for 1 W	Cost AC	Cost binder	Cost current collector	Energy cost
Units	mW·m−2	m2.w−1	mg·cm−2	kg	kg	$	$	$	$·W−1
PTFE	101	9.9	186	6.91	3.84	14.10	23.39	65.35	102.84
SAC	51	19.6	236	23.14		69.42	–	–	69.42
PVA-10	73	13.7	56	3.45	0.38	7.05	0.87	90.41	98.33
PVA-5	64	15.6	91	6.75	0.36	13.79	0.81	103.13	117.73
CPD-5	68	14.7	248	17.32	0.91	35.37	6.38	97.06	138.82

^aNormalized by the total exposed surface area of both cathodes of each SSM-MFC (2 cathodes = 45 cm² × 4 sides = 180 cm²). It has to be noted that the quantity of material was calculated for the surface area of the 2 cathodes (90cm²).