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EP 4 816 595 A1

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(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24828115.6 (22) Date of filing: 29.11.2024

(51) International Patent Classification (IPC):  C25B 1/04(2021.01) C25B 11/052(2021.01) C25B 9/23(2021.01) C25B 11/075(2021.01) (52) Cooperative Patent Classification (CPC): C25B 1/04; C25B 11/052; C25B 11/075; C25B 9/23; C25B 11/091; C25B 9/73; Y02E 60/36 (86) International application number: PCT/GB2024/052995 (87) International publication number: WO 2025/114716 (05.06.2025 Gazette 2025/23)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 01.12.2023 GB 202318420 (71) Applicants: Cambridge Enterprise Limited Cambridge, Cambridgeshire CB2 1TN (GB) National University of Singapore Singapore 119077 (SG)

(72) Inventors: CHHOWALLA, Manish Cambridge Cambridgeshire CB3 0FS (GB) XU, Wenshuo Cambridge Cambridgeshire CB3 0FS (GB) (74) Representative: Reddie & Grose LLP  The White Chapel Building 10 Whitechapel High Street London E1 8QS London E1 8QS (GB)