{
    "title": "The Car That Makes Its Own Fuel",
    "inventor_name": "Amnon Yogev",
    "publication_year": 2005,
    "device_name": "Metal-Steam combustor",
    "goal": "Generate hydrogen and steam on-board a a vehicle to replace conventional liquid fuels and achieve zero-emission propulsion.",
    "problem_addressed": "Hazardous storage, transport and handling of hydrogen and dependence on petroleum fuels for automotive applications.",
    "concept_summary": "A long metal coil (magnesium or aluminum) is introduced into a heated water chamber (the Metal-Steam combustor). The metal reacts exothermically with water, producing hydrogen gas, steam, and metal oxide waste. The hydrogen- fed to the engine, while the metal oxide is collected for recycling. An optional condensed-phase oxidizer (hydrogen peroxide) can further oxidize the hydrogen, releasing additional heat.",
    "detailed_description": "The system replaces the conventional fuel tank with a Metal-Steam combustor. During refuelling the metal wire is rolled into a coil and inserted into the combustor together with water; heating the tip to high temperature drives the reaction: 2 Mg + 2 H_2O -> 2 MgO + H_2 + heat (or analogous Al reaction). The generated hydrogen and steam are directed to the engine, providing propulsion. Spent metal oxide is vacuum-sucked out of the vehicle and taken to a fuel station for recycling. The design claims comparable range and operating cost to conventional cars, with an added coil weight of about 100 kg.",
    "category": "Hydrogen & Alternative Fuels",
    "principles": [
        "Exothermic metal oxidation",
        "Water splitting via metal-water reaction",
        "Hydrogen oxidation by condensed-phase oxidizer (hydrogen peroxide)",
        "Direct-contact heat exchange"
    ],
    "scientific_domains": [
        "Chemistry",
        "Thermodynamics",
        "Mechanical Engineering",
        "Materials Science"
    ],
    "mechanisms_of_action": [
        "Metal + water -> metal oxide + hydrogen + heat",
        "Hydrogen + hydrogen peroxide -> water + heat",
        "Heat drives internal-combustion or turbine engine"
    ],
    "materials": [
        "Magnesium",
        "Aluminum",
        "Metal oxides (MgO, Al_2O_3)",
        "Water",
        "Hydrogen peroxide"
    ],
    "energy_sources": [
        "Chemical energy of metal oxidation",
        "Chemical energy of hydrogen peroxide oxidation"
    ],
    "inputs": [
        "Metal coil (Mg/Al)",
        "Water",
        "Hydrogen peroxide (optional)",
        "Air (oxygen) for combustion (if used)"
    ],
    "outputs": [
        "Hydrogen gas",
        "Steam",
        "Metal oxide waste",
        "Mechanical work (propulsion)"
    ],
    "claimed_performance": "Vehicle range comparable to an equivalent conventional car; running cost equal to that of present-day gasoline cars; zero tail-pipe emissions.",
    "experimental_evidence": "No quantitative test data provided; claims are based on interviews and patent description. Prototype not yet built.",
    "replication_status": "Company is in an incubator program and seeking investors to develop a full-scale prototype; no independent replication reported.",
    "keywords": [
        "hydrogen generation",
        "metal oxidation",
        "on-board fuel",
        "zero emission",
        "metal coil",
        "steam",
        "hydrogen peroxide",
        "closed-loop energy"
    ],
    "related_technologies": [
        "Fuel cells",
        "Hydrogen storage",
        "Metal hydride systems",
        "Water electrolysis"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.7,
    "practicability_score": 0.5,
    "fringe_score": 0.4,
    "evidence_strength": 0.3,
    "risk_score": 0.2,
    "trl_estimate": 3,
    "source_urls": [
        "http://www.rexresearch.com/hydrogen_generator.html"
    ],
    "organizations": [
        "Engineuity",
        "Weizmann Institute"
    ],
    "applications": [
        "Automotive propulsion",
        "Fuel-cell power supply",
        "Portable hydrogen generation"
    ],
    "limitations": [
        "Heavy metal coil (~100 kg) reduces vehicle payload",
        "Requires continuous supply of metal fuel",
        "Handling and recycling of metal oxide waste",
        "Use of hydrogen peroxide introduces safety considerations",
        "No demonstrated prototype or performance data"
    ],
    "open_questions": [
        "Long-term durability of the metal coil under repeated oxidation cycles",
        "Overall system efficiency compared to conventional fuels",
        "Economic viability of metal consumption and oxide recycling",
        "Scalability of the refuelling process for mass-market vehicles"
    ],
    "red_flags": [
        "Performance claims (range, cost) lack supporting data",
        "Reliance on future recycling infrastructure for metal oxides",
        "Potential safety hazards associated with hydrogen peroxide handling"
    ],
    "evidence_quotes": [
        "The system solves all of the obstacles associated with the manufacturing, transporting and storing of hydrogen to be used in cars.",
        "The metal atoms will bond to the Oxygen from the water, creating metal oxide. As a result, the Hydrogen molecules are free, and will be sent into the engine alongside the steam.",
        "The solid waste product of the process, in the form of metal oxide, will later be collected in the fuel station and recycled for further use by the metal industry.",
        "The only minor drawback, which also limits the choice of possible metal fuel sources, is the weight of the coil. In order for the Hydrogen car to be able to travel as far as a conventional car it needs a metal coil three-times heavier than an equivalent petrol tank.",
        "Engineuity is currently in the advanced stages of the incubator program of the Chief Scientist in Israel, and is seeking investors that will allow it to develop a full scale prototype."
    ]
}