Optimizing the structural configuration of FePt-FeOx nanoparticles at the atomic scale by tuning the post-synthetic conditions

Xiaofei Liu; Zachary D. Hood; Qiang Zheng; Tian Jin; Guo Shiou Foo; Zili Wu; Chengcheng Tian; Yanglong Guo; Sheng Dai; Wangcheng Zhan; Huiyuan Zhu; Miaofang Chi

doi:10.1016/j.nanoen.2018.10.066

Optimizing the structural configuration of FePt-FeO_x nanoparticles at the atomic scale by tuning the post-synthetic conditions

Xiaofei Liu, Zachary D. Hood, Qiang Zheng, Tian Jin, Guo Shiou Foo, Zili Wu, Chengcheng Tian, Yanglong Guo, Sheng Dai, Wangcheng Zhan, Huiyuan Zhu, Miaofang Chi

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Tailoring the atomic structural configuration at metal and oxide interface offers an effective route for the development of catalysts with optimized properties. Here, we report the design of a unique structural configuration of yolk-shell-like FePt-FeO_x nanoparticles (NPs), that exhibits notably enhanced activity and stability towards CO oxidation at relatively low temperatures (<100 °C) compared with Pt NPs. The optimized FePt-FeO_x catalysts were produced by partially reducing core-shell FePt-FeO_x NPs under H₂ at 200 °C. The structural configuration was interrogated by advanced electron microscopy, which clearly reveals the evolution of the morphology, elemental segregation, and phase transition of FePt-FeO_x NPs after the post-synthesis treatment. The generation of voids, partial crystallization of the FeO_x shell and increased electron density on Pt were identified as key contributors to the enhanced activity and stability towards CO oxidation in FePt-FeO_x NPs. This unique structural configuration allows for CO and O₂ diffusion through the FeO_x shell with an increased exposure for CO and O₂ adsorption onto the core as well as an enhanced activation of O₂ compared with the core-shell FePt-FeO_x without voids, which collectively boost the catalytic performance.

Original language	English
Pages (from-to)	441-446
Number of pages	6
Journal	Nano Energy
Volume	55
DOIs	https://doi.org/10.1016/j.nanoen.2018.10.066
State	Published - Jan 2019

Funding

This research was supported by the U.S. Department of Energy , Office of Science , Office of Basic Energy Sciences , Chemical Sciences , Geosciences , and Biosciences Division , and was performed at the Center for Nanophase Materials Sciences at Oak Ridge National Laboratory (ORNL), which is a DOE Office of Science User Facility. XFL acknowledges the support from CSC. XFL and WCZ also thank the National Key Research and Development Program of China ( 2016YFC0204300 ), the National Natural Science Foundation of China ( 21577034 ). ZDH gratefully acknowledges a Graduate Research Fellowship award from the National Science Foundation ( DGE-1650044 ) and the Georgia Tech-ORNL Fellowship.

Keywords

CO oxidation
Metal oxide interface
Pt catalysis
Scanning transmission electron microscopy
Yolk-shell structure

Access to Document

10.1016/j.nanoen.2018.10.066

Cite this

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title = "Optimizing the structural configuration of FePt-FeOx nanoparticles at the atomic scale by tuning the post-synthetic conditions",

abstract = "Tailoring the atomic structural configuration at metal and oxide interface offers an effective route for the development of catalysts with optimized properties. Here, we report the design of a unique structural configuration of yolk-shell-like FePt-FeOx nanoparticles (NPs), that exhibits notably enhanced activity and stability towards CO oxidation at relatively low temperatures (<100 °C) compared with Pt NPs. The optimized FePt-FeOx catalysts were produced by partially reducing core-shell FePt-FeOx NPs under H2 at 200 °C. The structural configuration was interrogated by advanced electron microscopy, which clearly reveals the evolution of the morphology, elemental segregation, and phase transition of FePt-FeOx NPs after the post-synthesis treatment. The generation of voids, partial crystallization of the FeOx shell and increased electron density on Pt were identified as key contributors to the enhanced activity and stability towards CO oxidation in FePt-FeOx NPs. This unique structural configuration allows for CO and O2 diffusion through the FeOx shell with an increased exposure for CO and O2 adsorption onto the core as well as an enhanced activation of O2 compared with the core-shell FePt-FeOx without voids, which collectively boost the catalytic performance.",

keywords = "CO oxidation, Metal oxide interface, Pt catalysis, Scanning transmission electron microscopy, Yolk-shell structure",

author = "Xiaofei Liu and Hood, {Zachary D.} and Qiang Zheng and Tian Jin and Foo, {Guo Shiou} and Zili Wu and Chengcheng Tian and Yanglong Guo and Sheng Dai and Wangcheng Zhan and Huiyuan Zhu and Miaofang Chi",

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year = "2019",

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doi = "10.1016/j.nanoen.2018.10.066",

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AU - Liu, Xiaofei

AU - Hood, Zachary D.

AU - Zheng, Qiang

AU - Jin, Tian

AU - Foo, Guo Shiou

AU - Wu, Zili

AU - Tian, Chengcheng

AU - Guo, Yanglong

AU - Dai, Sheng

AU - Zhan, Wangcheng

AU - Zhu, Huiyuan

AU - Chi, Miaofang

PY - 2019/1

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