{
    "title": "EC3 Cement - Electron-Conducting Carbon Concrete",
    "inventor_name": "Damian Stefaniuk et al.",
    "publication_year": 2025,
    "device_name": "EC3 Cement (electron-conducting carbon concrete)",
    "goal": "Provide structural building materials that simultaneously store electrical energy, enabling integrated energy storage in walls, sidewalks, and other load-bearing elements.",
    "problem_addressed": "The built environment lacks built-in, scalable energy storage; conventional batteries are separate, add cost and weight, and do not contribute to structural performance.",
    "concept_summary": "EC3 cement is a cement-based composite that incorporates ultra-fine carbon black and an electrolyte to create a percolating conductive nanonetwork within the concrete. This network functions as a supercapacitor, storing charge via double-layer capacitance while retaining the mechanical strength of traditional concrete.",
    "detailed_description": "The material combines ordinary Portland cement, water, nano-scale carbon black particles, and a liquid electrolyte (ionic or organic). During casting, the carbon particles form a fractal-like conductive network throughout the matrix. A cast-in electrolyte approach allows the electrolyte to be retained within the pores, eliminating post-curing steps. Prototypes include a 12 V, 50 F supercapacitor module and a 9 V arch that bears load while delivering stored energy. Energy density has been reported to increase tenfold compared with earlier carbon-cement designs, reducing the volume needed for a household's daily power from ~45 m^3 to ~5 m^3.",
    "principles": [
        "Percolating conductive carbon network",
        "Electrochemical double-layer capacitance",
        "Electrolyte ion transport within porous cement matrix",
        "Fractal nanostructure for high surface area"
    ],
    "scientific_domains": [
        "Materials Science",
        "Electrochemistry",
        "Civil Engineering",
        "Energy Storage"
    ],
    "mechanisms_of_action": [
        "Electron conduction through carbon black network",
        "Ion adsorption at carbon-electrolyte interface forming electric double layer",
        "Charge transport via electrolyte-filled pores",
        "Mechanical load-bearing by cement matrix"
    ],
    "materials": [
        "Portland cement",
        "Water",
        "Ultra-fine carbon black (nanoscale)",
        "Electrolyte (ionic or organic)",
        "Nanoporous cement matrix"
    ],
    "energy_sources": [
        "Electrical energy (charging)",
        "Renewable grid electricity (as source of charge)"
    ],
    "inputs": [
        "Electrical charging voltage",
        "Water for mixing",
        "Carbon black powder",
        "Electrolyte solution"
    ],
    "outputs": [
        "Stored electrical energy (discharge)",
        "Structural support",
        "Heat (if used for de-icing)"
    ],
    "claimed_performance": "10-fold increase in supercapacitor energy density; 12 V, 50 F module; 9 V arch prototype; household daily power achievable with ~5 m^3 of EC3 versus ~45 m^3 previously.",
    "experimental_evidence": "Nanoscale 3D imaging (FIB-SEM) visualized the percolating carbon network; linear scaling of performance with electrode thickness and cell count; demonstration of a 12 V, 50 F module and a 9 V load-bearing arch.",
    "replication_status": null,
    "keywords": [
        "carbon cement",
        "supercapacitor",
        "energy storage",
        "conductive concrete",
        "EC3",
        "structural battery",
        "nanoporous cement"
    ],
    "related_technologies": [
        "Structural batteries",
        "Traditional supercapacitors",
        "Conductive polymers",
        "Carbon nanomaterial electrodes"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.3,
    "evidence_strength": 0.7,
    "risk_score": 0.2,
    "trl_estimate": 5,
    "source_urls": [
        "https://news.mit.edu/2025/concrete-battery-now-packs-ten-times-power-1001",
        "https://www.concrete.org/portals/0/files/pdf/webinars/ws_F23_Stefaniuk.pdf",
        "https://www.pnas.org/doi/10.1073/pnas.2511912122"
    ],
    "organizations": [
        "MIT",
        "Concrete Sustainability Hub",
        "US Patent Office"
    ],
    "applications": [
        "Building-integrated energy storage",
        "Autonomous housing power supply",
        "Load-bearing structural elements with embedded storage",
        "Pavement de-icing (heated cement)",
        "Thermal insulation"
    ],
    "limitations": [
        "Need for durable electrolyte containment",
        "Potential trade-off between mechanical strength and capacitance",
        "Cost and scalability of ultra-fine carbon black",
        "Long-term cycling stability under environmental exposure"
    ],
    "open_questions": [
        "How many charge-discharge cycles can the material sustain without degradation?",
        "What is the optimal electrolyte composition for durability and safety?",
        "Can large-scale casting processes retain the nanostructured conductive network?",
        "What are the lifecycle environmental impacts of carbon-black production for this application?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "Through nanoscale 3D imaging, electrolyte optimization, and multicell stacking, we demonstrate the production of high-voltage, energy-storing concrete components capable of powering devices and supporting mechanical loads.",
        "In these prototypes, device performance scales linearly with electrode thickness and cell count.",
        "The fabricated designs ultimately achieving a 10-fold increase in supercapacitor energy density compared to previous designs.",
        "We were able to fabricate a 12 V, 50 F supercapacitor module and a 9 V arch prototype that integrate energy storage into load-bearing architectural elements."
    ],
    "category": "Materials Science & Ceramics"
}