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US 2023/0411639 A1Published application
Electrochemical cell electrocatalyst
AssigneeRobert Bosch GmbH
InventorsKarim GADELRAB, Mordechai KORNBLUTH, Soo KIM, Jonathan MAILOA
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Abstract
An electrocatalyst includes a conglomerate of platinum atoms forming an amorphous nanoparticle structure having at least about 40% of highly undercoordinated surface atoms with fewer than 6 adjacent atoms on its surface; and a passivating crust including catalytically active monoatomic adsorbed oxygen atoms such that at least 50% of the amorphous nanoparticle structure has oxygen coverage, the amorphous nanoparticle structure having a diameter of up to 3 nm.
Claims20
An electrocatalyst comprising:
- a conglomerate of platinum atoms forming an amorphous nanoparticle structure having at least about 40% of highly undercoordinated surface atoms with fewer than 6 adjacent atoms on its surface;
- and
- a passivating crust including catalytically active monoatomic adsorbed oxygen atoms such that at least 50% of the amorphous nanoparticle structure has oxygen coverage,
- the amorphous nanoparticle structure having a diameter of up to 3 nm.
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A cathode catalyst layer comprising:
- an electrocatalyst support;
- an electrocatalyst attached onto the support, the electrocatalyst having
- a highly amorphous nanoparticle structure comprising a plurality of inner atoms and surface atoms, the surface atoms comprising at least about 30% atoms with lone pairs having a coordination number of less than 6, based on the total mass of the surface atoms;
- and
- a stable corrosion-resistive layer of adsorbed oxygen species covering at least 50% of the surface atoms.
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An electrochemical cell comprising:
- an anode;
- a membrane separating the anode from a cathode;
- and
- the cathode including a cathode catalyst layer having an electrocatalyst comprising a plurality of platinum ultra-fine, highly amorphized nanoparticles, each having a diameter of up to about 3 nm and having an amorphous inner core covered with a passivating crust of oxygen species adsorbed onto the surface of the amorphous inner core at more than 50% surface coverage.
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Dependencies are inferred from the claim text.