Abstract

The scarcity of energy is a major constraint in economic growth of any country. Day-by-day increasing demand of energy is deteriorating our environment quality. In order to combat environmental pollution threat, clean and green energy sources are critically enforced. Naturally occurring relative humidity has been probed in the form of humidity sensor. Highly resistive ceria doped magnesium ferrite thin film exhibited a colossal decrease in resistance of the order of 107 with only environmental humidity change from 10 to 95%RH. Such huge colossal humidoresistance of magnesium ferrite paved way to research on energy harvesting from water molecule dissociation at room temperature. Nanoporous and oxygen-deficient lithium substituted magnesium ferrite has been processed to make it highly sensitive towards water molecule dissociation into OH− and H+ ions. Electrochemistry has been adapted to collect these dissociated ions by two dissimilar electrodes zinc anode and silver inert cathode. The redox reactions on these electrodes generated power and the device is named ‘Hydroelectric Cell’. The working principle of hydroelectric cell has been also validated in other ferrite and different metal-oxides such as Fe3O4, Fe2O3, SnO2, TiO2, ZnO, Al2O3, MgO and SiO2. The redox reactions at electrodes of hydroelectric cell provide eco-friendly and commercially viable byproducts hydrogen and zinc hydroxide.

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