(19)
(11) EP 4 394 084 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.08.2024 Bulletin 2024/33

(43) Date of publication A2:
03.07.2024 Bulletin 2024/27

(21) Application number: 23203871.1

(22) Date of filing: 16.10.2023
(51) International Patent Classification (IPC): 
C25B 1/04(2021.01)
C25B 9/19(2021.01)
C25B 11/052(2021.01)
 C25B 3/26(2021.01)
C25B 9/50(2021.01)
(52) Cooperative Patent Classification (CPC):
C25B 1/04; C25B 3/26; C25B 9/19; C25B 9/50; C25B 11/052
(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:
KH MA MD TN

(30) Priority: 28.12.2022 JP 2022212561

(71) Applicant: Hitachi, Ltd.
Tokyo 100-8280 (JP)

(72) Inventors:
  • TAKAHASHI, Hiromasa
    Tokyo, 100-8280 (JP)
  • FUKATANI, Naoto
    Tokyo, 100-8280 (JP)
  • TAKAMATSU, Daiko
    Tokyo, 100-8280 (JP)
  • YABUUCHI, Shin
    Tokyo, 100-8280 (JP)
  • HAYAKAWA, Jun
    Tokyo, 100-8280 (JP)

(74) Representative: Strehl Schübel-Hopf & Partner 
Maximilianstrasse 54
80538 München
80538 München (DE)

   


(54) PHOTOCATALYTIC APPARATUS


(57) A photocatalytic apparatus is provided that uses a photovoltaic action for both electrodes and conjugates a photocatalytic action with the photovoltaic action to efficiently perform material transformation on the basis of a redox reaction on the electrodes using light energy. A photocatalytic apparatus includes a first electrode (10) functioning as an anode and a second electrode functioning as a cathode. The first electrode (10) includes a first transparent conductive substrate (11) having light transmittivity and electrical conductivity, a first light power generation layer (14) that is disposed on the first transparent conductive substrate (11) and absorbs light to generate electrons and holes, and a photocatalytic layer (15) that is disposed on the first light power generation layer (14) and catalyzes an oxidation reaction when being irradiated with light. The second electrode includes a second transparent conductive substrate (21) having light transmittivity and electrical conductivity, a second light power generation layer (24) that is disposed on the second transparent conductive substrate (21) and absorbs light to generate electrons and holes, and a catalytic layer (27) that is disposed on the second light power generation layer (24) and catalyzes a reduction reaction.







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