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 (Pt1-xFex)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 (Pt1-xFex)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 (Pt1-xFex)3Al. Compared with the traditional oxygen reduction catalysts Pt/C materials and the Pt46Fe54/Pt alloys, the prepared (Pt1-xFex)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 (Pt1-xFex)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 (Pt1-xFex)3Al/Pt alloy is endowed with favorable catalytic activity as well as satisfactory stability.
宋大凤, 雷宗坤, 曾小华. 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[J]. 材料导报, 2018, 32(23): 4061-4066.
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. Materials Reports, 2018, 32(23): 4061-4066.
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2018, Vol. 32 
