{
  "abstract": "Previous work on lead-free tin halide perovskites showed that the binder instead sets the electrolyte concentration at which capacitance is maximised, following the relationship $100 \\times [\\mathrm{Li}^+]_{\\mathrm{opt}} + \\mathrm{PVDF}_{\\mathrm{wt}\\%} = ξ_{\\mathrm{Int}}$ with $ξ_{\\mathrm{Int}} = 25 \\pm 2.5$, established by varying the loading of a single polymer. Whether $ξ_{\\mathrm{Int}}$ is universal or specific to that polymer has not been tested. Here, four binders spanning fluorinated (PVDF), carboxylic (PAA), cellulosic (CMC) and sulfonic (PEDOT:PSS) chemistry are compared on $\\mathrm{CsPbBr_3}$ nanocrystal electrodes at four LiTFSI concentrations in acetonitrile, with binder loading fixed at 15 wt% and all other formulation variables held constant. The relationship applies to $\\mathrm{CsPbBr_3}$: PVDF at 15 wt% gives an optimum at 0.10--0.15 M and 112 F g$^{-1}$, against 126 F g$^{-1}$ reported for $\\mathrm{CsSnCl_3}$ under the same conditions, extending the result to a different B-site cation, halide and crystal system. PVDF and CMC optimise at 0.10 M, giving $ξ_{\\mathrm{Int}} = 25$, while PAA and PEDOT:PSS optimise at 0.15 M, giving $ξ_{\\mathrm{Int}} = 30$, with maximum values of 188 F g$^{-1}$ for PAA and 146 mF cm$^{-2}$ for PEDOT:PSS. The two binders showing the shift carry ionisable acid groups at high density, indicating that $ξ_{\\mathrm{Int}}$ expressed in weight percent requires a binder-specific value. In all four electrodes, $\\mathrm{CsPbBr_3}$ converts to $\\mathrm{PbBr_2}$ and CsBr during electrochemical characterisation, and the surface lead content of the PEDOT:PSS electrode decreases.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.14588",
  "author_total": 2,
  "authors": [
    {
      "name": "Arun Kumar"
    },
    {
      "name": "Monojit Bag"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aheh2xrvq3rh8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.14588",
  "fulltext_url": null,
  "id": "aheh2xrvq3rh8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.14588",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2504|Supercapacitor Materials and Fabrication"
    ]
  ],
  "openalex": "W7213341731",
  "pdf_url": "https://arxiv.org/pdf/2609.14588",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/aheh2xrvq3rh8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.14588",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.14588"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Binder chemistry sets the interfacial balance constant in CsPbBr$_3$ nanocrystal supercapacitor electrodes",
  "title_text": "Binder chemistry sets the interfacial balance constant in CsPbBr_3 nanocrystal supercapacitor electrodes",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/aheh2xrvq3rh8",
  "venue": "arXiv",
  "versions": []
}