Facile synthesis of fully ordered L1(0)-FePt nanoparticles with controlled Pt-shell thicknesses for electrocatalysis

조회수 : 22 등록일 : 2017.07.20 00:00

저자 : Hong, Y (Hong, Yonghoon) ; Seo, WS (Seo, Won Seok)
출판일 : 2017.08.01
Facile synthesis of fully ordered L1(0)-FePt nanoparticles with controlled Pt-shell thicknesses for electrocatalysis
Hong, Y (Hong, Yonghoon)[ 1 ] ; Kim, HJ (Kim, Hee Jin)[ 2,3 ] ; Yang, D (Yang, Daehee)[ 1 ] ; Lee, G (Lee, Gaehang)[ 4,5 ] ; Nam, KM (Nam, Ki Min)[ 6 ] ; Jung, MH (Jung, Myung-Hwa)[ 7 ] ; Kim, YM (Kim, Young-Min)[ 8,9 ] ; Choi, SI (Choi, Sang-Il)[ 2,3 ] ; Seo, WS (Seo, Won Seok)[ 1 ]
[ 1 ] Sogang Univ, Dept Chem, Seoul 04107, South Korea
[ 2 ] Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea
[ 3 ] Kyungpook Natl Univ, Green Nano Mat Res Ctr, Daegu 41566, South Korea
[ 4 ] Korea Basic Sci Inst, Daejeon 34133, South Korea
[ 5 ] Univ Sci & Technol, Daejeon 34133, South Korea
[ 6 ] Mokpo Natl Univ, Dept Chem, Jeonnam 58554, South Korea
[ 7 ] Sogang Univ, Dept Phys, Seoul 04107, South Korea
[ 8 ] Inst Basic Sci, Ctr Integrated Nanostruct Phys, Suwon 16419, South Korea
[ 9 ] Sungkyunkwan Univ SKKU, Dept Energy Sci, Suwon 16419, South Korea
We report a simple one-step approach for the synthesis of similar to 4 nm uniform and fully L1(0)-ordered face-centered tetragonal (fct) FePt nanoparticles (NPs) embedded in similar to 60 nm MCM-41 (fct-FePt NPs@MCM-41). We controlled the Pt-shell thickness of the fct-FePt NPs by treating the fct-FePt NPs@MCM-41 with acetic acid (HOAc) or hydrochloric acid (HCl) under sonication, thereby etching the surface Fe atoms of the NPs. The fct-FePt NPs deposited onto the carbon support (fct-FePt NP/C) were prepared by mixing the fct-FePt NPs@MCM-41 with carbon and subsequently removing the MCM-41 using NaOH. We also developed a facile method to synthesize acid-treated fct-FePt NP/C by using a HF solution for simultaneous surface-Fe etching and MCM-41 removal. We studied the effects of both surface-Fe etching and Pt-shell thickness on the electrocatalytic properties of fct-FePt NPs for the methanol oxidation reaction (MOR). Compared with the non-treated fct-FePt NP/C catalyst, the HOAc-treated and HCl-treated catalysts exhibit up to 34% larger electrochemically active surface areas (ECASAs); in addition, the HCl-treated fct-FePt NP (with similar to 1.0 nm Pt shell)/C catalyst exhibits the highest specific activity. The HF-treated fct-FePt NP/C exhibits an ECASA almost 2 times larger than those of the other acid-treated fct-FePt NP/C catalysts and shows the highest mass activity (1,435 Pt, 2.3 times higher than that of the commercial Pt/C catalyst) and stability among the catalysts tested. Our findings demonstrate that the surface-Fe etching for the generation of the Pt shell on fct-FePt NPs and the Pt-shell thickness can be factors for optimizing the electrocatalysis of the MOR.
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