{
    "title": "TiO2-Polyaniline Supercapacitor",
    "inventor_name": "Esha Khare",
    "publication_year": 2013,
    "device_name": "TiO2-Polyaniline Supercapacitor",
    "goal": "Increase the energy density of electrochemical supercapacitors while retaining high power density and long cycle life.",
    "problem_addressed": "Long charging times and low energy density of conventional batteries and existing supercapacitors for portable electronics.",
    "concept_summary": "A flexible solid-state supercapacitor electrode composed of a core-shell nanorod structure with a hydrogenated TiO2 core and a polyaniline shell. The TiO2 provides double-layer capacitance, while the conductive polymer adds pseudocapacitive charge storage, resulting in higher overall capacitance and energy density.",
    "detailed_description": null,
    "category": "Nanotechnology",
    "principles": [
        "Electrochemical double-layer capacitance",
        "Pseudocapacitive redox reactions",
        "Core-shell nanorod architecture",
        "Flexible solid-state electrolyte integration"
    ],
    "scientific_domains": [
        "Electrochemistry",
        "Materials Science",
        "Nanotechnology",
        "Energy Storage"
    ],
    "mechanisms_of_action": [
        "Electrostatic charge storage at TiO2 surface",
        "Redox-based pseudocapacitance of polyaniline",
        "High surface-area nanorod electrode for rapid ion transport"
    ],
    "materials": [
        "Hydrogenated TiO2 (H-TiO2) nanorods",
        "Polyaniline (PANI) polymer shell",
        "Solid-state electrolyte (unspecified)",
        "Conductive substrate (e.g., ITO glass)"
    ],
    "energy_sources": [],
    "inputs": [
        "Electrical charging current (voltage source)",
        "LED load for demonstration"
    ],
    "outputs": [
        "Stored electrical energy",
        "LED illumination",
        "Potential to charge a cell phone"
    ],
    "claimed_performance": "Capacitance 203.3 mF/cm^2 (238.5 F/g); energy density 20.1 Wh/kg; power density 20 540 W/kg; retains >67% capacitance after 10 000 charge-discharge cycles at 200 mV/s.",
    "experimental_evidence": "Lab measurements reported capacitance 203.3 mF/cm^2, energy density 20.1 Wh/kg, power density 20 540 W/kg and a 32.5 % capacitance loss after 10 000 cycles at 200 mV/s.",
    "replication_status": null,
    "keywords": [
        "Supercapacitor",
        "TiO2",
        "Polyaniline",
        "Nanorods",
        "Flexible electronics",
        "Energy storage"
    ],
    "related_technologies": [
        "Flexible solid-state supercapacitors",
        "Roll-up displays",
        "Wearable power modules"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.2,
    "evidence_strength": 0.7,
    "risk_score": 0.1,
    "trl_estimate": 4,
    "source_urls": [
        "http://www.dailymail.co.uk/news/article-2327021/Teenager-invents-revolutionary-device-charges-cell-phone-20-seconds.html",
        "http://www.rexresearch.com/ti02polyaniline/ti02polyaniline.html"
    ],
    "organizations": [
        "Intel International Science and Engineering Fair",
        "University of California Santa Cruz",
        "Google"
    ],
    "applications": [
        "Fast charging of cell phones",
        "Flexible displays and wearable electronics",
        "Power source for electric vehicles (conceptual)"
    ],
    "limitations": [
        "Scalability of nanorod synthesis not demonstrated",
        "Long-term stability beyond 10 000 cycles unknown",
        "Manufacturing cost and integration into commercial devices not addressed"
    ],
    "open_questions": [
        "Can the energy density be further increased while keeping flexibility?",
        "What are the optimal solid-state electrolyte materials for this architecture?",
        "How does repeated mechanical flexing affect performance over millions of cycles?"
    ],
    "red_flags": [
        "The claim of charging a cell phone in 20 seconds is not experimentally demonstrated in the article."
    ],
    "evidence_quotes": [
        "It demonstrated high capacitance of 203.3 mF/cm^2 (238.5 F/g) compared to the next best alternative supercapacitor in previous research of 80 F/g.",
        "This resulted in excellent energy density of 20.1 Wh/kg, comparable to batteries, while maintaining a high power density of 20 540 W/kg.",
        "It also demonstrated a much higher cycle life compared to batteries, with a low 32.5 % capacitance loss over 10 000 cycles at a high scan rate of 200 mV/s."
    ]
}