Mechanism

The FJH primitive operates by passing a high-current electrical discharge through a packed bed of conductive feedstock confined between two electrodes, dissipating Joule energy directly within the feedstock mass over a pulse duration on the order of one to one hundred milliseconds. Because heating is internal to the feedstock rather than conducted from an external furnace wall, the entire bed reaches graphenization temperature essentially simultaneously, with thermal gradients limited to those imposed by local resistivity variation. The pulse profile is engineered such that peak feedstock temperature falls in the 2,500 to 3,000 K window, at which point amorphous and graphitic carbon precursors reorganize into turbostratic graphene, a layered carbon allotrope characterized by random rotational stacking between adjacent sheets rather than the AB or ABC registry of crystalline graphite.

The reorganization occurs by sublimation-recondensation and direct solid-state rearrangement of sp³ and disordered sp² carbon into planar sp² networks. Concurrently, the elevated temperature volatilizes non-carbon species: oxygen evolves predominantly as carbon monoxide and carbon dioxide, nitrogen as N₂ and trace cyanogenic species, hydrogen as H₂ and light hydrocarbons, and inorganic salts as metal vapors or oxides depending on the feedstock matrix. The pulse is sufficiently brief that the carbon framework does not anneal into ordered graphite; rotational disorder is kinetically trapped, preserving turbostratic character. This trapped disorder is the property of interest, because the inter-sheet voids it creates contribute directly to the surface area and ion-accessibility behavior the downstream cell architecture relies on.

Operating Parameters

Operation is parameterized along four primary axes: discharge voltage, pulse duration, feedstock packing density, and atmosphere. Discharge voltage is selected such that ohmic heating raises bed temperature to the 2,500 to 3,000 K window; typical capacitor-bank embodiments deliver 100 to 400 V across a centimeter-scale electrode gap, sourcing peak currents of hundreds to thousands of amperes for pulse durations between one and one hundred milliseconds. Total energy delivered per gram of feedstock typically ranges from one to ten kilojoules, with lower energies adequate for high-conductivity precursors (petroleum coke, carbon black) and higher energies required for biomass with substantial volatile fraction.

Feedstock packing density governs initial bed resistance and is tuned to place bed impedance within the discharge circuit's optimal load window. Packing too loose produces arcing and uneven heating; packing too dense impedes evolved-gas escape and can cause pressure-driven ejection of the bed during the pulse. Atmosphere is typically inert (argon, nitrogen) or mildly reducing; atmospheric oxygen would oxidize the nascent graphene at peak temperature, defeating the process. Pulse repetition is generally single-shot in research embodiments, but production embodiments may apply a series of two to five pulses with intervening cooling intervals to ramp toward target conversion without bed ejection. The output is a friable, low-density flake population recovered by mechanical de-packing of the spent electrode chamber.

Alternative Embodiments

The disclosed FJH primitive admits several embodiments differentiated by feedstock conditioning, electrode geometry, and discharge topology. In a first embodiment, raw biomass is dried to less than five percent moisture and ground to a millimeter-scale particulate prior to loading; pre-pyrolysis to char is optional but often improves conductivity sufficient for a single-pulse conversion. In a second embodiment, non-biomass feedstocks (petroleum coke, metallurgical coal, plastic waste, tire-derived carbon black, mixed municipal organics) are admitted with comparable conditioning, with the primitive's broad feedstock tolerance constituting its principal differentiation from the three sibling carbonization modes.

A third embodiment substitutes a continuous-flow electrode geometry for the static-bed configuration: feedstock is augered through a tubular electrode pair while pulses are applied in synchronization with bed advance, enabling continuous throughput at the cost of more demanding pulse-timing control. A fourth embodiment applies the discharge through a fluidized bed, in which inert-gas suspension of the feedstock provides uniform pulse coupling and immediate evolved-gas removal. A fifth embodiment couples FJH with downstream collection optics for in-line characterization (Raman spectroscopy of the I₃/I₂ ratio, BET adsorption sampling) so that pulse parameters can be closed-loop tuned to feedstock variation.

Process Control and Diagnostics

Process control during a production run is exercised through pulse-by-pulse monitoring of discharge waveform, bed impedance trajectory, and post-pulse output sampling. The discharge waveform, instantaneous voltage and current as functions of time across the pulse, is captured at megahertz sampling and integrated to produce per-pulse energy delivered, peak current, and pulse-energy delivery profile. Bed impedance trajectory across the pulse is diagnostic of feedstock conversion: a well-converted bed transitions from initial high-impedance feedstock to low-impedance graphenized state within the pulse, exhibiting a characteristic impedance collapse approximately one-third of the way through the pulse duration. Departures from the expected trajectory (premature collapse, persistent high impedance, or oscillatory impedance) signal feedstock anomalies (excess moisture, packing voids, conductive contamination) that warrant batch rejection or pulse-parameter adjustment.

Post-pulse output sampling is performed by Raman spectroscopy on a representative aliquot drawn from the discharge chamber after each pulse. The I₃/I₂ intensity ratio, the 2D-band lineshape, and the G-band position are recorded and compared against an embodiment-specific specification window. Outputs falling outside the window are diverted from the carbon-substrate-flow path to a rework or rejection bin; outputs within window are committed to the downstream porosity-preservation primitive for cementitious admixture preparation. Cumulative process records (pulse waveforms, impedance trajectories, Raman fingerprints, and feedstock lot identifiers) are retained as part of the manufacturing lineage chain and are signed under credentialed admissibility for traceability across downstream cell assembly.

Composition

The graphene output is characterized by three concurrent metrics: turbostratic ordering, hierarchical porosity, and surface area. Turbostratic ordering is verified by Raman spectroscopy: the 2D band appears as a single Lorentzian at approximately 2,690 cm⁻¹, distinguishing turbostratic from AB-stacked few-layer graphene which shows a multi-component 2D band. Hierarchical porosity is characterized by nitrogen adsorption-desorption isotherms analyzed under BET and BJH models, distinguishing micropores in the 0.5 to 2 nm range, mesopores in the 2 to 50 nm range, and macropores in the 50 to 500 nm range. The fraction in each regime depends on feedstock; biomass-derived FJH product typically retains the cellulose-lignin native length scales as macropore architecture, with mesopores generated by gas-evolution channels and micropores intrinsic to the turbostratic interlayer.

Surface area in the 200 to 2,000 m²/g range covers the working envelope; the upper bound corresponds to feedstocks with high oxygen content whose evolution generates aggressive porosity, while the lower bound corresponds to dense conductive precursors yielding flake-dominant morphologies. The output is electrically conductive (typical sheet resistance 10 to 1,000 ohm-square depending on flake size and packing) and chemically reactive at edge sites, enabling downstream functionalization including the alkali-metal doping and the hydrogen-binding chemistry employed in the carbon-bound cell.

Prior-Art Context

Flash Joule heating as a graphene synthesis route has been developed in the public literature, notably by the Tour group at Rice University, and is described in publications from 2020 onward as a route from carbonaceous waste streams to flash graphene at gram-per-second throughput. The primitive disclosed here adopts that physical mechanism but configures it as the upstream step of a closed-cycle carbon-bound cell rather than as a stand-alone material-synthesis end product. The disclosure contemplates FJH in conjunction with three sibling carbonization modes, hydrothermal carbonization (HTC) for wet biomass, pyrolytic carbonization for moderate-temperature char production, and catalytic graphitization for ordered-structure outputs, selectable by feedstock and downstream-property requirement, with FJH covering the broadest feedstock envelope and the most aggressive porosity-generation regime.

Conventional graphene synthesis routes are explicitly distinguished. Chemical vapor deposition (CVD) on metallic substrates produces high-quality monolayer graphene but at low throughput and with substrate-transfer overhead inappropriate for bulk active-material production. The Hummers oxidation-reduction route produces graphene oxide and reduced graphene oxide at high throughput but introduces persistent oxygen functionalities that interfere with downstream hydrogen-binding chemistry. Mechanical and liquid-phase exfoliation produces few-layer graphene at moderate throughput but with narrow feedstock range (typically restricted to crystalline graphite precursors). None of these routes simultaneously deliver the feedstock breadth, hierarchical porosity, and turbostratic ordering required by the downstream cell architecture; FJH is selected on this combined basis rather than on any single property.

Disclosure Scope

The disclosure scope of the FJH primitive comprises the millisecond resistive-pulse mechanism applied to a carbonaceous feedstock between conductive electrodes at 2,500 to 3,000 K to produce turbostratic graphene with hierarchical porosity at BET 200 to 2,000 m²/g, where the resulting graphene is committed to the downstream carbon-substrate-flow subsystem feeding the carbon-bound cell. The disclosure encompasses static-bed, continuous-flow, and fluidized-bed embodiments; biomass and non-biomass feedstocks; single-pulse and multi-pulse pulse trains; and embodiments coupled to in-line spectroscopic characterization for closed-loop pulse tuning. The disclosure does not encompass FJH embodiments that produce ordered AB-stacked few-layer graphene, nor those that operate outside the 2,500 to 3,000 K window, since these embodiments do not produce the turbostratic, hierarchically porous output that the downstream cell architecture relies upon.