{
  "abstract": "Understanding catalyst stability under fluctuating potentials is essential for renewable-powered water electrolysis, yet the surface processes governing degradation remain unclear. Here, we investigate IrO2(110) and IrO2(100) single-crystal thin films under potential cycling relevant to renewable-powered proton-exchange membrane water electrolysis. The activity of IrO2(110) increased after cycling, whereas IrO2(100) deactivated. X-ray photoelectron spectroscopy indicated higher Ir valence on both facets, accompanied by a pronounced increase in surface OH species only on (110). O K-edge X-ray absorption spectroscopy revealed larger oxidation-induced changes on (100), while in situ X-ray absorption fine-structure measurements showed reversible electronic and local structural responses on (110) but irreversible structural evolution on (100). These contrasting responses demonstrate that surface stability under fluctuating potentials cannot be inferred from oxidation state alone. Rather, it depends on whether the facet-specific coordination environment can reversibly accommodate coupled redox and structural perturbations. These results identify redox accommodation as a mechanistic descriptor for oxide electrocatalyst durability under dynamic operation.",
  "abstract_shown": true,
  "affiliations": [
    "Graduate School of Environmental Studies",
    "Tohoku University",
    "Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, Japan, 277-8581",
    "Japan Synchrotron Radiation Research Institute, Kouto, Sayo-cho",
    "Graduate School of Engineering"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 13,
  "authors": [
    {
      "affs": [
        0,
        1
      ],
      "name": "Yuto Okayama"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Tomohiro Yoshinaga"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Naomi Naraki"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Arata Umehara"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Taichi Hama"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Haruto Fuse"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Yao Fangyi"
    },
    {
      "affs": [
        2
      ],
      "name": "Wenxiong Zhang"
    },
    {
      "affs": [
        2
      ],
      "name": "Hiroshi Ando"
    },
    {
      "affs": [
        2
      ],
      "name": "Yoshihisa Harada"
    },
    {
      "affs": [
        3
      ],
      "name": "Takeshi Watanabe"
    },
    {
      "affs": [
        4,
        1
      ],
      "name": "Tomoki Uchiyama"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Naoto Todoroki",
      "orcid": "0000-0003-4811-6398"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6drdc1qzsb4kw.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15008297/v1",
  "fulltext_url": null,
  "id": "6drdc1qzsb4kw",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008297/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2105|Electrocatalysts for Energy Conversion"
    ]
  ],
  "openalex": "W7208768699",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15008297/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/6drdc1qzsb4kw.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:17Z",
      "native_id": "10.26434/chemrxiv.15008297",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008297/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2105|Electrocatalysts for Energy Conversion",
      "subfield": "electrochemistry-energy"
    }
  ],
  "title": "Facet-Dependent Redox Reversibility Governs the Stability of IrO2 Surfaces under Dynamic Electrochemical Potentials",
  "title_text": "Facet-Dependent Redox Reversibility Governs the Stability of IrO2 Surfaces under Dynamic Electrochemical Potentials",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:17Z",
  "url": "https://research.draconitic.com/paper/6drdc1qzsb4kw",
  "venue": "ChemRxiv",
  "versions": []
}