Silver maybe the key to Triboelectricity or power produced from Static Charges

Soon your smart phone will charge as you move, really!

From Source:
Researchers in South Korea and Australia are harnessing
the power of triboelectricity, the technical term for static
electricity, which occurs when two different materials rub
against each other and then separate. In the separating process,
one material steals electrons from the other – the spark that we
feel from our fingertips – but harnessing this tiny amount of
electricity is tricky - The mechanism is a pliable layer of two
fabrics, one coated in silver and the other in silver, zinc oxide
nanorods.

Commentary:
Human powered is calorie powered, maybe some mobile phone couch patatoes will now have to get off their butts and move to keep tossing those angry birds.

Sources:
https://www.nature.com/articles/srep35153
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201603199
http://advances.sciencemag.org/content/3/5/e1700015.full
https://www.school-for-champions.com/science/static_materials.htm#.WtN7zi5uat8
The Silver Institute