{
  "abstract": "Cost-effective alkaline water electrolysis requires non-precious-metal electrocatalysts that sustain the hydrogen evolution reaction (HER) at high current densities while maintaining favorable interfacial kinetics and an accessible electrode structure. Here, Co incorporation was used to suppress the long-range crystalline order of Fe and generate poorly crystalline Fe-Co aerogels through one-pot NaBH₄ reduction, gelation, and freeze-drying. A Fe100-xCox series (x = 0, 60, 80, and 100; nominal feed compositions) was examined to determine how composition-induced structural changes affect network morphology, interfacial accessibility, and high-current HER behavior. Among the series, FeCo60-A formed the finest interconnected particle network and exhibited the largest BET surface area (34.1 m² g⁻¹), a high double-layer capacitance (1.04 mF cm⁻²), and the smallest apparent Nyquist arc. After iR correction, it required overpotentials of 345, 520, and 685 mV to reach 100, 500, and 1000 mA cm⁻², respectively, and maintained a nearly constant potential during 24 h operation at -1000 mA cm⁻² while largely retaining its interconnected porous morphology. These results demonstrate that Co incorporation into the Fe-based aerogel framework effectively tunes structural order and interfacial characteristics, enabling improved HER performance under high-current alkaline conditions.",
  "abstract_shown": true,
  "affiliations": [
    "Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.",
    "Center for Hydrogen and Fuel Cells, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.",
    "Department of Materials Science and Engineering, Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan 31116, Republic of Korea.",
    "Aerogel Materials Research Center, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea."
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Sang-Hyun Kim",
      "orcid": "0009-0005-8789-7264"
    },
    {
      "affs": [
        0
      ],
      "name": "Haryeong Choi",
      "orcid": "0000-0002-0136-3052"
    },
    {
      "affs": [
        1
      ],
      "name": "Younghun Kim",
      "orcid": "0000-0001-8172-5713"
    },
    {
      "affs": [
        2
      ],
      "name": "Taehee Kim",
      "orcid": "0009-0001-8189-1102"
    },
    {
      "affs": [
        0,
        3
      ],
      "name": "Hyung-Ho Park",
      "orcid": "0000-0001-5540-5433"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9k9y9504brac7.bib",
  "cited_by": 0,
  "doi": "10.3390/gels12100932",
  "fulltext_url": "https://europepmc.org/articles/PMC13704690",
  "id": "9k9y9504brac7",
  "issns": [
    "2310-2861"
  ],
  "landing_url": "https://europepmc.org/article/MED/42929966",
  "language": "eng",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2105|Electrocatalysts for Energy Conversion"
    ]
  ],
  "openalex": "W7222482929",
  "pdf_url": "https://europepmc.org/articles/PMC13704690?pdf=render",
  "pmcid": "PMC13704690",
  "pmid": "42929966",
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9k9y9504brac7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:01Z",
      "native_id": "MED:42929966",
      "source": "europepmc",
      "url": "https://europepmc.org/article/MED/42929966"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2105|Electrocatalysts for Energy Conversion",
      "subfield": "electrochemistry-energy"
    }
  ],
  "title": "Composition-Driven Structural Regulation of Fe-Co Aerogels for High-Current-Density Hydrogen Evolution.",
  "title_text": "Composition-Driven Structural Regulation of Fe-Co Aerogels for High-Current-Density Hydrogen Evolution.",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:22:01Z",
  "url": "https://research.draconitic.com/paper/9k9y9504brac7",
  "venue": "Gels (Basel, Switzerland)",
  "versions": []
}