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Phase Segregated Pt–SnO 2 /C Nanohybrids for Highly Efficient Oxygen Reduction Electrocatalysis
Author(s) -
Guan Jingyu,
Zan Yongxi,
Shao Rong,
Niu Jin,
Dou Meiling,
Zhu Baoning,
Zhang Zhengping,
Wang Feng
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202005048
Subject(s) - materials science , catalysis , electrocatalyst , platinum , tin oxide , chemical engineering , carbon black , nanoparticle , annealing (glass) , alloy , tin , carbon fibers , oxygen , oxide , noble metal , nanotechnology , metal , electrode , electrochemistry , chemistry , composite number , metallurgy , composite material , organic chemistry , engineering , biochemistry , natural rubber
Strengthening the interfacial interaction in heterogeneous catalysts can lead to a dramatic improvement in their performance and allow the use of smaller amounts of active noble metal, thus decreasing the cost without compromising their activity. In this work, a facile phase‐segregation method is demonstrated for synthesizing platinum–tin oxide hybrids supported on carbon black (PtSnO 2 /C) in situ by air annealing PtSn alloy nanoparticles on carbon black. Compared with a control sample formed by preloading SnO 2 on carbon support followed by deposition of Pt nanoparticles, the phase‐segregation‐derived PtSnO 2 /C exhibits a more strongly coupled PtSnO 2 interface with lattice overlap of Pt (111) and SnO 2 (200), along with enhanced electron transfer from SnO 2 to Pt. Furthermore, the PtSnO 2 active sites show a strong ability to degrade reactive oxygen species. As a result, the PtSnO 2 /C nanohybrids exhibit both excellent activity and stability as a catalyst for the oxygen reduction reaction, with an overall performance which is superior to both the control sample and commercial Pt/C catalyst. This phase‐segregation method can be expected to be applicable in the preparation of other strongly coupled nanohybrids and offers a new route to high‐performance heterogeneous catalysts for low‐cost energy conversion devices.