CO tolerance and durability study of PtMe(Me = Ir or Pd) electrocatalysts for H2-PEMFC application. (14th April 2021)

• Record Type: Journal Article
• Authors: Brouzgou, Angeliki; Seretis, Antonis; Song, Shuqin; Shen, Pei Kang; Tsiakaras, Panagiotis
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 26(2021)
• Page Start: 13865
• Page End: 13877
• Publication Date: 2021-04-14
• Subjects: Pt–Ir & Pt–Pd electrocatalysts -- Synergistic effect -- Durability -- CO tolerance -- Oxygen reduction reaction -- Hydrogen oxidation reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.07.224
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In the present work, carbon supported PtMe (Me = Ir or Pd) electrocatalysts, with different atomic ratios (Pt/Me (20 wt%) = 3:1, 1:1, 1:3), are thoroughly investigated towards CO tolerance and durability, as anode and cathode for H2 -PEMFCs (hydrogen fed proton exchange membrane fuel cells) application. The electrocatalysts are prepared via a pulse-microwave assisted polyol synthesis method and their durability and electrocatalytic activity in presence and absence of CO are evaluated using the techniques of electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), linear sweep voltammetry (LSV), chronoamperometry (CA) and rotating disk electrode (RDE). For the investigation of CO tolerance a protocol is set that could be used by other research groups, since various procedures are reported in literature. It is found that Pd/C shows higher CO tolerance than Pt/C, while the PtPd3 /C exhibits the highest CO tolerance ability, even after being exposed for 9 h at 400 ppm CO. Despite the fact that Pt3 Ir/C shows higher CO tolerance ability than Pt/C, it cannot resist at such high CO concentrations for more than 6 h. Finally, it is found that PtIr/C and PtPd/C exhibit very good durability even after 5000 accelerated durability test (ADT) cycles, while Pt3 Pd/C and PtPd/C present the highest mass activities (339.4 and 410 mA/mgPt respectively at 0.9 V), which are 4 and 5 times higher than the one observed over commercial Pt/C (82.75 mA/mgPt ). Highlights: PtMe (Me=Ir or Pd)/C are investigated towards CO-tolerance and ORR durability in acidic media. The insertion of Pd improves Pt's tolerance, showing the optimum resistance at Pt: Pd=1: 3. Platinum alloys exhibit considerable improvement in both activity and durability towards ORR. The addition of small amounts of Pd or Ir improves the electrocatalytic activity of pure platinum. Both PtIr/C and PtPd/C exhibit good durability after 5000 accelerated durability test- cycles.