Enhanced Catalytic Activities of NiPt Truncated Octahedral Nanoparticles toward Ethylene Glycol Oxidation and Oxygen Reduction in Alkaline Electrolyte.
The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in alkaline electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our results demonstrate that the dramatic enhancement is mainly attributed to Pt-rich surface, larger specific surface area, together with coupling between Ni and Pt atoms. This developed method provides a promising pathway for simple preparation of highly efficient electrocatalysts for PEMFCs in the near future.
Department of Physics, Beihang University , Beijing 100191, China.|University of Science and Technology Beijing , Beijing 100083, China.
Tianyu
T
Xia
Department of Physics, Beihang University , Beijing 100191, China.
Jialong
J
Liu
University of Science and Technology Beijing , Beijing 100083, China.|Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Shouguo
S
Wang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Chao
C
Wang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Young
Y
Sun
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.
Lin
L
Gu
Department of Physics, Beihang University , Beijing 100191, China.|University of Science and Technology Beijing , Beijing 100083, China.
Rongming
R
Wang
D004573:Electrolytes; D019855:Ethylene Glycol; D053768:Metal Nanoparticles; D010100:Oxygen; D010984:Platinum
D004573:Electrolytes; D010984:Platinum; D019855:Ethylene Glycol; D010100:Oxygen
EGOR; NiPt truncated octahedral nanoparticles; ORR; PEMFC; alkaline electrolyte