New Approach to Fully Ordered fct-FePt Nanoparticles for Much Enhanced Electrocatalysis in Acid

作者：Li, Qing; Wu, Liheng; Wu, Gang; Su, Dong; Lv, Haifeng; Zhang, Sen; Zhu, Wenlei; Casimir, Anix; Zhu, Huiyuan; Mendoza-Garcia, Adriana; Sun, Shouheng^*

来源：Nano Letters, 2015, 15(4): 2468-2473.

DOI：10.1021/acs.nanolett.5b00320

• face-centered tetragonal structure
• nanoparticles
• electrocatalysis
• oxygen reduction
• hydrogen evolution

Fully ordered face-centered tetragonal (fct) FePt nanoparticles (NPs) are synthesized by thermal annealing of the MgO-coated dumbbell-like FePt-Fe3O4 NPs followed by acid washing to remove MgO. These fct-FePt NPs show strong ferromagnetism with room temperature coercivity reaching 33 kOe. They serve as a robust electrocatalyst for the oxygen reduction reaction (ORR) in 0.1 M HClO4 and hydrogen evolution reaction (HER) in 0.5 M H2SO4 with much enhanced activity (the most active fct-structured alloy NP catalyst ever reported) and stability (no obvious Fe loss and NP degradation after 20 000 cycles between 0.6 and 1.0 V (vs RHE)). Our work demonstrates a reliable approach to FePt NPs with much improved fct-ordering and catalytic efficiency for ORR and HER.

• 出版日期2015-4