Let's throw some graphene into the mix...

Nano-scale wetting phenomenon to produce voltage by harvesting phase change producing currents -

It is possible to produce a few picowatts from humidity. This could be scaled up massively and could yield a future atmospheric energy generating apparatus. If anything it is more useful information and helps to propel energy sciences a little tiny bit further on.





Further reading: http://scitation.aip.org/content/aip/journal/apl/105/1/10.1063/1.4886798