{
  "abstract": "Prussian blue (PB) and its analogues (PBAs) are attractive electrode materials for energy storage because of their chemical tunability, open-framework structures, fast ion transport, and rich redox chemistry. Yet, their practical implementation remains limited due to the challenging processability and the discrete set of redox potentials accessible through conventional compositions. Here, a 3D flow-focusing microfluidic strategy is used for directly synthesizing and printing freestanding PB and PBA composite fibers in a single step, coupling particle formation with their integration into an alginate/carbon-nanotube matrix. The method yields continuous, self-supporting fibers incorporating PB and multiple PBAs (Co, Ni, Cu, Zn), which can be directly written into functional electrode architectures and assembled into working energy storage cells. Beyond processability, the platform enables two complementary routes for voltage design: high-entropy PBAs, which access redox responses distinct from those of conventional single-metal PBAs, and spatially encoded fibers in which different PBAs are integrated within one fiber to generate intermediate and deliberately tuned electrochemical behavior. By exploiting the inherent spatial and temporal control afforded by microfluidic flow focusing, the approach establishes a versatile route toward printed, application-tailored PB and PBA electrodes with programmable operating voltages.",
  "abstract_shown": true,
  "affiliations": [
    "Departament de Ciència dels Materials i Química Física and Institut de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645, 08028 Barcelona, Spain",
    "Transport Phenomena Research Center (CEFT), Associate Laboratory in Chemical Engineering (ALiCE) Faculty of Engineering, University of Porto Rua Dr. Roberto Frias, 4200-465 Porto, Portugal",
    "Experian Lda Rua Professor Correia Araújo 697, 4200-205, Porto, Portugal",
    "Multi-scale Robotics Laboratory, ETH. Zurich, Tannenstrasse 3, 8092 Zurich, Switzerland",
    "Institució Catalana de Recerca i Estudis Avançats (ICREA) Pg. Lluís Companys 23, Barcelona 08010, Spain"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 7,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Anh Tuan Ngo"
    },
    {
      "affs": [
        1
      ],
      "name": "João Pedro Vale",
      "orcid": "0000-0002-2836-1057"
    },
    {
      "affs": [
        2
      ],
      "name": "Maria Pinto"
    },
    {
      "affs": [
        3
      ],
      "name": "Salvador Pané",
      "orcid": "0000-0003-0147-8287"
    },
    {
      "affs": [
        1
      ],
      "name": "Tiago Sotto Mayor",
      "orcid": "0000-0001-8779-1033"
    },
    {
      "affs": [
        0
      ],
      "name": "Mario Palacios Corella",
      "orcid": "0000-0001-6480-1569"
    },
    {
      "affs": [
        0,
        4
      ],
      "name": "Josep Puigmartí-Luis",
      "orcid": "0000-0002-7510-9815"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e8pp9jdhg0pb6.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010235/v1",
  "fulltext_url": null,
  "id": "e8pp9jdhg0pb6",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010235/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",
      "2504|Supercapacitor Materials and Fabrication"
    ]
  ],
  "openalex": "W7221536526",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15010235/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-11",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/e8pp9jdhg0pb6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:22Z",
      "native_id": "10.26434/chemrxiv.15010235",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010235/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "openalex:2504|Supercapacitor Materials and Fabrication",
      "subfield": "materials-polymers"
    }
  ],
  "title": "Direct-Write Printing of Freestanding Prussian Blue Analogue Fibers with Tunable Redox Potentials",
  "title_text": "Direct-Write Printing of Freestanding Prussian Blue Analogue Fibers with Tunable Redox Potentials",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:22Z",
  "url": "https://research.draconitic.com/paper/e8pp9jdhg0pb6",
  "venue": "ChemRxiv",
  "versions": []
}