The water fuel cell is a non-functional design for a "perpetual motion machine" created by Stanley Allen Meyer (August 24, 1940 – March 20, 1998).
[1] The mechanism of action was alleged to involve "Brown's gas", a mixture of oxyhydrogen with a ratio of 2:1, the same composition as liquid water; which would then be mixed with ambient air (nitrogen, oxygen, argon, etc).
"[5] In a news report on an Ohio TV station, Meyer showed a dune buggy he claimed was powered by his water fuel cell.
[2] Philip Ball, writing in academic journal Nature, characterized Meyer's claims as pseudoscience, noting that "It's not easy to establish how Meyer's car was meant to work, except that it involved a fuel cell that was able to split water using less energy than was released by recombination of the elements ... Crusaders against pseudoscience can rant and rave as much as they like, but in the end they might as well accept that the myth of water as a fuel is never going to go away.
"[4] Stanley Meyer's invention was later termed fraudulent after two investors to whom he had sold dealerships offering the right to do business in Water Fuel Cell technology sued him in 1996.
[1] After an investigation, the Grove City police agreed with the Franklin County coroner report that ruled that Meyer, who had high blood pressure, died of a cerebral aneurysm.
[1][4][11] Philippe Vandemoortele, one of the Belgian investors, stated that he had been supporting Meyer financially for several years and considered him a personal friend, and that he has no idea where the rumors came from.