02 · Candidate dossier

Graphene-confined hydride candidate

Hydrogen molecules confined between bilayer graphene sheets adopt a partially ionic configuration under modest pressure.

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01

Frontmatter

Dossier metadata

Identifier
xh-graphene-confined
Family
Graphene-confined molecular hydride
Composition
C-H confined system
Pressure target
1–10 GPa
Status
Generated
X-Score
X-Score58·Moderate
Created
2025-12-31T23:56:00.000Z
Next gate
DFT relaxation
02

Hypothesis

Structural hypothesis & rationale

Structural hypothesis

Hydrogen molecules confined between bilayer graphene sheets adopt a partially ionic configuration under modest pressure.

Expected EPC potential

Confinement may push H modes into a coupled regime with graphene π-bands; the coupling strength is highly speculative.

Tc rationale

Hypothesis: hydrogen confinement modifies the phonon spectrum sufficiently to support a measurable EPC contribution. Requires direct DFPT validation.

Synthesis pathway

Bilayer graphene exfoliated onto a substrate with hydrogen exposure under modest pressure.

03

Risks

Stability & limitations

Stability risk

Hydrogen leakage through graphene edges and intercalation kinetics are uncertain.

Phonon stability risk

Confined H-H modes may be highly anharmonic.

Limitations

  • Hydrogen retention in confined geometries is speculative.
  • EPC mechanism has not been validated computationally.
04

Evidence

X-Score evidence panel

Recommended next validation step: DFT relaxation.

X-Score58·Moderate
#SubscoreWeightValue
  1. 01Thermodynamic Stability15%55
  2. 02Phonon Stability15%55
  3. 03EPC Potential20%54
  4. 04DOS / Fermi-Level Relevance10%64
  5. 05Pressure Feasibility15%60
  6. 06Synthesis Feasibility10%63
  7. 07Novelty5%55
  8. 08Validation Readiness10%65
ThermoPhononEPCDOS/EFPressureSynthNoveltyValidate

Risk flags

  • No high-severity risk flags raised.
05

Pipeline

Validation timeline

Each gate must produce reproducible computational artifacts before progression.

  1. 01Generatedcurrent
  2. 02Awaiting DFT
  3. 03Awaiting DFPT
  4. 04Awaiting EPW
  5. 05Awaiting Eliashberg
  6. 06Awaiting RPA
  7. 07Experimental validation required
06

Checklist

Hydride-domain validation checklist

Items the candidate must address before any quantitative claim is attempted.

  • 01Zero-point energy correction
  • 02Anharmonic phonon correction
  • 03Isotope H/D effect study
  • 04Pressure sweep across the target window
  • 05Convex hull / decomposition pathway analysis
  • 06Diamond anvil cell (DAC) synthesis feasibility assessment

Recommended validation steps

  • DFT relaxation including van der Waals correction
  • DFPT phonon dispersion with anharmonic correction
  • Experimental electronic transport at low temperatures
  • Zero-point energy correction
  • Anharmonic phonon correction
  • Isotope H/D effect study
  • Pressure sweep across the target window
  • Convex hull / decomposition pathway analysis
  • Diamond anvil cell (DAC) synthesis feasibility assessment
07

Workflow

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