TY - JOUR
T1 - Designed synthesis of highly catalytic Ni–Pt nanoparticles for fuel cell applications
AU - Taniguchi, Kaneyuki
AU - Shinoda, Kozo
AU - Cuya Huaman, Jhon L.
AU - Yokoyama, Shun
AU - Uchikoshi, Masahito
AU - Matsumoto, Takatoshi
AU - Suzuki, Kazumasa
AU - Miyamura, Hiroshi
AU - Jeyadevan, Balachandran
N1 - Funding Information:
This study was supported by the Grant-in-Aid for the promotion and enhancement of education and research from the University of Shiga Prefecture (2018). The in situ X-ray Absorption Spectroscopy (XAS) measurements were made using the Engineering Science Research II beamline (BL14B2) at Spring-8, Japan. Project Nos. 2017B1623 and 2018A1549.
Publisher Copyright:
© 2018, Springer Nature Switzerland AG.
PY - 2019/1
Y1 - 2019/1
N2 - A modified alcohol reduction process by controlling the complexation and reduction of metallic ions was developed to obtain compositionally and structurally controlled Ni–Pt nanoparticles (NPs) with sizes less than 20 nm in a high yield. The characterization of NPs synthesized under different experimental conditions suggested that the reduction of Pt and subsequent formation of cubic-shaped Ni–Pt NPs were strongly dependent on the formation of Pt-oleylamine (OAm) complexes. Thus, prior to the synthesis of Ni–Pt NPs, the formation and reduction process of Pt complexes in the solution-state were investigated by in situ UV–Visible and X-ray spectroscopies. The complexation of Pt ions along with their reduction prior to the formation of Pt metal and their influence on the size and the elemental distribution of Pt within the Ni–Pt NPs were revealed. Then, the above findings were actively utilized to design and to obtain Pt(core)–Ni(shell), Ni–Pt alloy, and Ni(core)–Pt(shell) nanostructures by regulating the OAm concentration in the system. The specific distribution of Pt on the Ni–Pt surface was confirmed by decolorization of methylene blue. Furthermore, Ni–Pt NPs with a Pt concentration of 10 at.% exhibited a mass activity four times larger than that of commercial Pt during the oxygen reduction reaction (ORR).
AB - A modified alcohol reduction process by controlling the complexation and reduction of metallic ions was developed to obtain compositionally and structurally controlled Ni–Pt nanoparticles (NPs) with sizes less than 20 nm in a high yield. The characterization of NPs synthesized under different experimental conditions suggested that the reduction of Pt and subsequent formation of cubic-shaped Ni–Pt NPs were strongly dependent on the formation of Pt-oleylamine (OAm) complexes. Thus, prior to the synthesis of Ni–Pt NPs, the formation and reduction process of Pt complexes in the solution-state were investigated by in situ UV–Visible and X-ray spectroscopies. The complexation of Pt ions along with their reduction prior to the formation of Pt metal and their influence on the size and the elemental distribution of Pt within the Ni–Pt NPs were revealed. Then, the above findings were actively utilized to design and to obtain Pt(core)–Ni(shell), Ni–Pt alloy, and Ni(core)–Pt(shell) nanostructures by regulating the OAm concentration in the system. The specific distribution of Pt on the Ni–Pt surface was confirmed by decolorization of methylene blue. Furthermore, Ni–Pt NPs with a Pt concentration of 10 at.% exhibited a mass activity four times larger than that of commercial Pt during the oxygen reduction reaction (ORR).
KW - Catalysis
KW - Complexation
KW - Fuel cell
KW - In situ UV–Visible and X-ray spectroscopies
KW - Ni–Pt nanoparticles
KW - Oxygen reduction reaction (ORR)
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U2 - 10.1007/s42452-018-0133-5
DO - 10.1007/s42452-018-0133-5
M3 - Article
AN - SCOPUS:85080829801
VL - 1
JO - SN Applied Sciences
JF - SN Applied Sciences
SN - 2523-3971
IS - 1
M1 - 124
ER -