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1. (WO2018046993) BELOW FREEZING START-UP METHOD FOR FUEL CELL SYSTEM

Pub. No.:    WO/2018/046993    International Application No.:    PCT/IB2017/001020
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Sat Aug 26 01:59:59 CEST 2017
IPC: H01M 8/04858
H01M 8/04223
Applicants: DAIMLER AG
FORD MOTOR COMPANY
NISSAN MOTOR CO., LTD.
Inventors: PROCTER, Michael
FUKUYAMA, Yosuke
FELLOWS, Richard
SHIOMI, Takeshi
IWAN, Laura
Title: BELOW FREEZING START-UP METHOD FOR FUEL CELL SYSTEM
Abstract:
Methods are disclosed for starting up a fuel cell system from starting temperatures below 0 °C. The methods apply to systems comprising a solid polymer electrolyte fuel cell stack whose cathodes comprise an oxygen reduction reaction (ORR) catalyst and whose anodes comprise both a hydrogen oxidation reaction (HOR) catalyst and an oxidation evolution reaction (OER) catalyst. In the methods, from the beginning of starting up until the fuel cell temperature reaches 0 °C, the fuel cell stack current is kept sufficiently low such that the current density drawn does not exceed the stack's capability for the oxidation evolution and the oxygen reduction reactions to occur at the anode and cathode respectively (i.e. current density drawn is less than the stack's maximum OER/ORR current density).