添加Al对燃料电池阴极催化剂(Pt-Fe)/Pt合金微观组织及氧还原催化性能的影响

doi:10.11896/j.issn.1005-023X.2018.23.005

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Abstract Aiming at improving the oxygen reduction catalytic activity and stability of the fuel cell cathode catalyst (Pt-Fe)/Pt alloy, Al element was introduced in the Pt-Fe alloy system, and the master alloy (Pt-Fe) Al was first obtained by smelting, then (Pt_1-_xFe_x)₃Al/Pt alloy, the catalyst for oxygen reduction reaction of the fuel cell, was obtained by directional corrosion of NaOH solution. The structure, catalytic activity and stability of the prepared catalyst were studied in depth. The results indicated that the prepared (Pt_1-_xFe_x)₃Al/Pt alloy bear an internally interconnected dual-mode pore structure composed of pure Pt shells with thickness of several atomic layers and a core of (Pt_1-_xFe_x)₃Al. Compared with the traditional oxygen reduction catalysts Pt/C materials and the Pt₄₆Fe₅₄/Pt alloys, the prepared (Pt_1-_xFe_x)₃Al/Pt alloy presented higher specific activity, which was 1.21 and 2.69 times of that of Pt₄₆Fe₅₄/Pt and Pt/C, and it also showed higher mass activity, which was 1.17 and 5.3 times of that of Pt₄₆Fe₅₄/Pt and Pt/C, respectively. In terms of catalytic stability, the electrochemical active area of (Pt_1-_xFe_x)₃Al/Pt tended to be stabilized after decaying to 89% at 10 000 cycles of volt-amperes, and remained at 80% after 40 000 cycles. It can be concluded that the (Pt_1-_xFe_x)₃Al/Pt alloy is endowed with favorable catalytic activity as well as satisfactory stability.

Key words： fuel cell element of Al (Pt-Fe-Al)/Pt alloy microstructure oxygen reduction catalytic properties

Published: 20 December 2018

CLC number:

TB34

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	Articles by authors
	SONG Dafeng
	LEI Zongkun
	ZENG Xiaohua

Cite this article:

SONG Dafeng,LEI Zongkun,ZENG Xiaohua. Impact of Al Addition on Microstructure and Oxygen Reduction Catalytic Performance of (Pt-Fe)/Pt Alloy Used as Fuel Cell Cathode Catalyst[J]. Materials Reports, 2018, 32(23): 4061-4066.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.23.005 OR http://www.mater-rep.com/EN/Y2018/V32/I23/4061

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