PROCÉDÉ DE GÉNÉRATION CONTINUE D'HYDROGÈNE PAR ÉLECTROLYSE DE L'EAU VIA UNE UNE APPROCHE DÉCOUPLÉE

    公开(公告)号:WO2023046775A1

    公开(公告)日:2023-03-30

    申请号:PCT/EP2022/076266

    申请日:2022-09-21

    Abstract: La présente demande concerne un procédé de génération continue d'hydrogène par électrolyse de l'eau, comprenant : - la polarisation d'une cellule électrochimique, la tension U étant supérieure ou égale à 1,5 V, ladite cellule électrochimique comprenant un compartiment négatif d'électrode et un compartiment positif d'électrode; - la production d'hydrogène à partir de la réduction d'un électrolyte aqueux dans ledit compartiment négatif d'électrode; - l'oxydation d'un réducteur « Red » en un oxydant « Ox », dans ledit compartiment positif d'électrode, ledit réducteur étant présent dans un anolyte aqueux apporté par circulation fluidique au sein du compartiment positif; - la circulation fluidique de l'anolyte contenant l'oxydant « Ox » dudit compartiment positif d'électrode vers un dispositif comprenant une espèce catalytique favorisant l'OER; - la réduction de l'oxydant « Ox » en sa forme réduite « Red » et la production d'oxygène dans le dispositif comprenant l'espèce catalytique OEC.

    A DEVICE FOR PERFORMING ELECTROLYSIS OF WATER, AND A SYSTEM THEREOF

    公开(公告)号:WO2022258676A1

    公开(公告)日:2022-12-15

    申请号:PCT/EP2022/065521

    申请日:2022-06-08

    Applicant: EPINOVATECH AB

    Abstract: A device (1) for performing electrolysis of water is disclosed. The device comprising: a semiconductor structure (10) comprising a surface (11) and an electron guiding layer (12) below said surface (11), the electron guiding layer (12) of the semiconductor structure (10) being configured to guide electron movement in a plane parallel to the surface (11), the electron guiding layer (12) of the semiconductor structure (10) comprising an InGaN quantum well (14) or a heterojunction (18), the heterojunction (18) being a junction between AlN material and GaN material or between AlGaN material and GaN material; at least one metal cathode (20) arranged on the surface (11) of the semiconductor structure (10); and at least one photoanode (30) arranged on the surface (11) of the semiconductor structure (10), wherein the at least one photoanode (30) comprises a plurality of quantum dots (32) of InxGa(1-x)N material, wherein 0.4 ≤ x ≤ 1. Also a system comprising such device is disclosed.

    PROTON EXCHANGE MEMBRANE WATER ELECTROLYZER MEMBRANE ELECTRODE ASSEMBLY

    公开(公告)号:WO2022169844A1

    公开(公告)日:2022-08-11

    申请号:PCT/US2022/014905

    申请日:2022-02-02

    Abstract: Method for forming a membrane electrode assembly, include for example, providing a first layer membrane, a second layer membrane, an anode electrode, and a cathode electrode. The first layer membrane has a first thickness, the second layer membrane has a thickness less than the first thickness, and the second layer membrane contains a catalyst content that is greater than a catalyst content in the first layer membrane. The first layer membrane, the second layer membrane, the anode electrode, and the cathode electrode are formed into a membrane electrode assembly (MEA) comprising an exchange membrane having an interface between the first layer membrane and the second layer membrane. In some embodiments, may include a first and second lamination process, a single laminating process, a roll-to-roll process, and/or a casting process.

    REDUCTION OF CHALCOPYRITE BY AN AQUEOUS PHASE REDUCANT TO ENABLE HYDROMETALLURGICAL EXTRACTION OF COPPER

    公开(公告)号:WO2022147078A1

    公开(公告)日:2022-07-07

    申请号:PCT/US2021/065450

    申请日:2021-12-29

    Abstract: A copper concentrate such as chalcopyrite is contacted with an aqueous solution includes acids and a reducing agent, such as vanadium (II) ions, chromium (II) ions, or tungstozincic acid (H6ZnW12O40). The aqueous solution reduces the copper in the copper concentrate, which can then dissolve into the solution for recovery therefrom, or precipitate out of solution as copper compounds or elemental copper for recovery in as a solid phase product. The solid phase product can then be isolated, dissolved, and further electrowinned to recover a copper product from the copper concentrate. Oxidized reducing agent can be recovered in an electrochemical device with ferrous iron reactants. Hydrometallurgical routes to convert copper concentrates to copper are potentially less expensive and less polluting than current pyrometallurgical processing and an advantageous response to environmental and economic pressures for increased copper production.

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