Electrode catalyst for fuel cell
OwnerMin Kim, Jin Park +1inventors
InventorsMin Kim, Jin Park, Hyuk Kim
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Abstract
Disclosed is an electrode catalyst comprising: (a) a support with a specific surface area of at least 1200 m2/g; and (b) platinum or platinum-containing alloy particles on the support, wherein the platinum is supported on the electrode catalyst in an amount of 56˜90 wt % based on the total weight of the electrode catalyst. A membrane electrode assembly (MEA) comprising the electrode catalyst and a fuel cell using the MEA are also disclosed. The electrode catalyst comprises platinum or platinum-containing alloy particles highly dispersed on a support with a large surface area in an amount of 56 wt % or more, and thus has an extended catalytically active region, resulting in improvement in the quality of a fuel cell.
Claims20
An electrode catalyst comprising:
- (a) a support with a specific surface area of 1200 m2/g or more;
- and
- (b) platinum or platinum-containing alloy particles supported on the support,
- wherein the platinum is supported on the electrode catalyst in an amount of 56˜90 wt % based on the total weight of the electrode catalyst.
A method for preparing an electrode catalyst comprising 56-90 wt % of platinum supported thereon, which comprises the steps of:
- (a) dispersing a support with a specific surface area of 1200 m2/g or more into a solvent to form a support dispersion, and adding a pH modifier thereto to provide an alkalified support dispersion;
- (b) adding a platinum precursor or platinum-containing alloy precursor compound and a pH modifier to the dispersion obtained from step (a), and further adding a reducing agent thereto to perform reaction of the mixture;
- and
- (c) drying the powder obtained from step (b).
A method for manufacturing an electrode catalyst that comprises platinum particles on a support with a specific surface area of 1200 m2/g or more, wherein the platinum particles have a particle size of 3.5 nm or less by controlling the theoretical amount of Pt on the support to 60 wt % or more.
Dependencies are inferred from the claim text.