Ballard Power Systems Corporation

Bdf IP Holdings Ltd.

Alan Young

Siyu Ye

Kyoung J Bai

Shanna Denine Knights

Emerson Richard Gallagher

Dustin William H Banham

Rajesh Bashyam

Alexander Man-Chung Leung

Yingduo Chen

Emerson R Gallagher

Shanna D Knights

A method is provided for operating a fuel cell stack with improved performance recovery from sub-saturated conditions, the method comprising setting an alert for the performance recovery of the fuel cell stack, performing at least one oxidant starvation by supplying oxidant at a stoichiometric ratio below 1 to the fuel cell stack in at least one pulse for a preset amount of time and at low current while the fuel cell stack does not generate power. The fuel cell system with an improved performance recovery comprises a shorting circuit which is connected to the fuel cell stack at predetermined times (startup, shutdown or standby mode) and an air compressor powered by a DC-DC converter which supplies a predetermined number of oxidant pulses of a predetermined duration to the fuel cell stack.

Method and system for operating an electrochemical fuel cell stack with improved performance recovery

A membrane electrode assembly comprises an anode electrode comprising an anode catalyst layer; a cathode electrode comprising a cathode catalyst layer; and a polymer electrolyte membrane interposed between the anode electrode and the cathode electrode; wherein at least one of the anode and cathode catalyst layers comprises a block co-polymer comprising poly(ethylene oxide) and poly(propylene oxide).

Membrane electrode assembly with improved cohesion

A membrane electrode assembly including: an anode electrode; a cathode electrode; and a polymer electrolyte membrane; wherein the cathode includes a first cathode catalyst sublayer including a first precious metal catalyst composition and a first ionomer composition including a first ionomer and a second ionomer; and a second cathode catalyst sublayer including a second precious metal catalyst composition and a second ionomer composition including a third ionomer; wherein the first ionomer is different from the second ionomer in at least one of chemical structure and equivalent weight.

Cathode electrode design for electrochemical fuel cells

A membrane electrode assembly comprises an anode electrode comprising an anode gas diffusion layer and an anode catalyst layer; a cathode electrode comprising a cathode gas diffusion layer and a cathode catalyst layer; and a polymer electrolyte membrane interposed between the anode catalyst layer and the cathode catalyst layer; wherein the cathode catalyst layer comprises: a first cathode catalyst sublayer adjacent the polymer electrolyte membrane, the first cathode catalyst sublayer comprising a first catalyst supported on a first carbonaceous support and a second catalyst supported on a second carbonaceous support; and a second cathode catalyst sublayer adjacent the cathode gas diffusion layer, the second cathode catalyst sublayer comprising a third catalyst supported on a third carbonaceous support; wherein the first carbonaceous support is carbon black and the second and third carbonaceous supports are graphitized carbon.

Cathode design for electrochemical cells

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Alan Young