SURFACE PROTECTED HIGH ACTIVITY PT ALLOY CATALYSTS FOR DURABLE HEAVY DUTY FUEL CELLS DEVELOP HIGHLY STABLE CATALYST MATERIALS AND CATALYST-IONOMER INTERFACES FOLLOWED BY INTEGRATION IN TO A LOW-PGM LOADED FUEL CELL MEMBRANE ELECTRODE ASSEMBLY (MEA) TO DEMONSTRATE ITS LOW COST (=0.30 MGPGM-TOTAL/CM2), PERFORMANCE, PEAK EFFICIENCY (= 68%) AND DURABILITY TO MEET OR EXCEED THE M2FCT TARGET FOR HEAVY-DUTY (HD) FUEL CELL APPLICATIONS (2.5 KW/GPGM AFTER ACCELERATED STRESS TEST EQUIVALENT TO 25,000 HOURS).