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1. (WO2007005081) VOLTAGE CYCLING DURABLE CATALYSTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2007/005081 International Application No.: PCT/US2006/011722
Publication Date: 11.01.2007 International Filing Date: 31.03.2006
IPC:
H01M 4/92 (2006.01) ,B01J 23/42 (2006.01) ,B01J 37/08 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
4
Electrodes
86
Inert electrodes with catalytic activity, e.g. for fuel cells
90
Selection of catalytic material
92
Metals of platinum group
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
23
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/113
38
of noble metals
40
of the platinum group metals
42
Platinum
B PERFORMING OPERATIONS; TRANSPORTING
01
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
J
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS, COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
37
Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
08
Heat treatment
Applicants:
GENERAL MOTORS GLOBAL TECHNOLOGY OPERATIONS, INC. [US/US]; Legal Staff - Mail Code 482-C23-B21 P.O. Box 300 Detroit, MI 48265-3000, US (AllExceptUS)
Inventors:
KOCHA, Shyam; US
MAKHARIA, Rohit; US
GASTEIGER, Hubert, A.; US
Agent:
ELLERBROCK, Charles, H.; General Motors Global Technology Operations, Inc. Legal Staff - Mail code 482-C23-B21 P.O. Box 300 Detroit, MI 48265-3000, US
Priority Data:
11/172,50430.06.2005US
Title (EN) VOLTAGE CYCLING DURABLE CATALYSTS
(FR) CATALYSEURS DURABLES EN SUCCESSION DE CYCLES DE TENSION
Abstract:
(EN) A fuel cell electrocatalyst layer having increased voltage cycling durability. The electrocatalyst layer comprises annealed platinum particles having an average particle size diameter from about 3 to about 15 nm deposited on a support structure. The platinum particles are annealed at a temperature from about 800 to about 1,400°C for a time period such that the surface area is reduced by about 20% as compared to the original surface area. In various embodiments, the electrocatalyst layer retains an electrochemical surface area that is greater than 50% of an original electrochemical surface area after about 15,000 voltage cycles in the range from about 0.6 to about 1.0 V.
(FR) Cette invention concerne une couche électrocatalytique de pile à combustible dont la succession de cycles de tension présente une plus grande durabilité. La couche électrocatalytique comprend des particules de platine recuites dont le diamètre moyen est compris entre environ 3 et environ 15 nm et qui sont déposées sur une structure support. Les particules de platine sont recuites à une température comprise entre environ 800 et environ 1400 °C pendant une durée suffisante pour que la surface active soit réduite d'environ 20 % comparée à la surface active de départ. Dans divers modes de réalisation, la couche électrocatalytique conserve une surface active électrochimique supérieure à 50 % d'une surface active électrochimique de départ après environ 15000 cycles de tension dans la gamme comprise entre 0,6 et environ 1,0 V.
front page image
Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, LY, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, LV, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
JP2009500789US20070003822CN101208820