{
  "id": "2108.06826",
  "version": "v1",
  "published": "2021-08-15T22:09:04.000Z",
  "updated": "2021-08-15T22:09:04.000Z",
  "title": "Tunable electrochemistry with moiré flat bands and topological defects at twisted bilayer graphene",
  "authors": [
    "Yun Yu",
    "Kaidi Zhang",
    "Holden Parks",
    "Mohammad Babar",
    "Stephen Carr",
    "Isabel Craig",
    "Madeline Van Winkle",
    "Artur Lyssenko",
    "Takashi Taniguchi",
    "Kenji Watanabe",
    "Venkatasubramanian Viswanathan",
    "D. Kwabena Bediako"
  ],
  "comment": "21 pages, 5 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci",
    "physics.chem-ph"
  ],
  "abstract": "Tailoring electron transfer dynamics across solid-liquid interfaces is fundamental to the interconversion of electrical and chemical energy. Stacking atomically thin layers with a very small azimuthal misorientation to produce moir\\'e superlattices enables the controlled engineering of electronic band structures and the formation of extremely flat electronic bands. Here, we report a strong twist angle dependence of heterogeneous charge transfer kinetics at twisted bilayer graphene electrodes with the greatest enhancement observed near the 'magic angle' (~1.1 degrees). This effect is driven by the angle-dependent tuning of moir\\'e-derived flat bands that modulate electron transfer processes with the solution-phase redox couple. Combined experimental and computational analysis reveals that the variation in electrochemical activity with moir\\'e angle is controlled by atomic reconstruction of the moir\\'e superlattice at twist angles <2 degrees, and topological defect AA stacking regions produce a large anomalous local electrochemical enhancement that cannot be accounted for by the elevated local density of states alone. Our results introduce moir\\'e flat band materials as a distinctively tunable paradigm for mediating electrochemical transformations.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-08-15T22:09:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "twisted bilayer graphene",
      "flat band",
      "topological defect",
      "tunable electrochemistry",
      "anomalous local electrochemical enhancement"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}