. 2015 Aug 25;10(8):e0136108. doi: 10.1371/journal.pone.0136108

Table 1. Cost-performance ratio for the different membrane materials.

Cost was linked to power density.

	Cost / € m^-2	P / mW m^-2	Cost/P / € mW^-1	Energy generated over a lifetime of 10 years / kWh m^-2	Total income generated over 10 years / € ^a m^-2
No membrane	93	24±0.02	3.93	2.1	0.15
Rhinohide	1.3	14±2.2	0.10	1.2	0.08
Nafion	448	29±2.6	15.5	2.5	0.18
ETFE	2.7	29±3.4	0.09	2.5	0.18
PVDF	1.8	11±0.5	0.16	1	0.07

^aAt the current electricity selling price in the UK of 0.07 € kWh^-1.