NOVELTY - An ozone generator comprises at least two identical supercapacitors (500) for amplifying reaction energy provided by power source through charging and discharging swing of the supercapacitors; circuitry (400) for controlling the supercapacitors to deliver a consistent power supply of amplified reaction energy; and a pair of electrodes (600) for receiving the consistent power supply for generating ozone. The anode comprises antimony(Sb)-nickel(Ni)-doped tin oxide (SnO2) obtained from Sb precursor, Ni precursor, SnO2 precursor and a carbon source through wet coating, pyrolysis, and sintering.    USE - An ozone generator for in-situ sterilization/disinfecting and detoxifying waters, e.g., potable waters.    ADVANTAGE - The generator is robust, chemical-free, compact, capable of being battery operated, can be immersed in water for in-situ sterilization/disinfection of water, and can be made pocket-sized. It can effectively perform in-situ sterilization of waters, and can easily be carried by the tourists traveling to places without adequate sanitation facilities.    DETAILED DESCRIPTION - An ozone generator for in-situ sterilization of water, comprises a power source; at least two identical supercapacitors (500) for amplifying reaction energy provided by the power source through charging and discharging swing (CD swing) of the supercapacitors; circuitry (400) for controlling the supercapacitors to deliver a consistent power supply of the amplified reaction energy to generate ozone; and at least a pair of electrodes (600) consisting of an anode and a cathode with a constant gap (0.5-5 mm) kept between them, for receiving the consistent power supply from the supercapacitors for generating ozone within the water to be treated. The anode comprises Sb-Ni-doped SnO2 obtained from Sb precursor, Ni precursor, SnO2 precursor and a carbon source through wet coating, pyrolysis, and sintering. The supercapacitors have an operating voltage of at least 2.5V and a capacitance of at least 0.5 F. The circuitry comprises a switching device comprising a relay or a MOSFET. The power source a primary battery (200), a secondary battery; a fuel cell, a solar cell, or a human-powered generator with a super capacitor.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a pocket-size ozone generator.    Lid (100)    Battery (200)    Circuitry (400)    Supercapacitors (500)    Electrodes (600)