Enhanced oxidation resistance of active nanostructures via dynamic size effect

Yun Liu, Fan Yang (), Yi Zhang, Jianping Xiao, Liang Yu, Qingfei Liu, Yanxiao Ning, Zhiwen Zhou, Hao Chen, Wugen Huang, Ping Liu and Xinhe Bao ()
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Yun Liu: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Fan Yang: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yi Zhang: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Jianping Xiao: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Liang Yu: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Qingfei Liu: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yanxiao Ning: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Zhiwen Zhou: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Hao Chen: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Wugen Huang: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Ping Liu: Brookhaven National Laboratory
Xinhe Bao: State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract A major challenge limiting the practical applications of nanomaterials is that the activities of nanostructures (NSs) increase with reduced size, often sacrificing their stability in the chemical environment. Under oxidative conditions, NSs with smaller sizes and higher defect densities are commonly expected to oxidize more easily, since high-concentration defects can facilitate oxidation by enhancing the reactivity with O2 and providing a fast channel for oxygen incorporation. Here, using FeO NSs as an example, we show to the contrary, that reducing the size of active NSs can drastically increase their oxidation resistance. A maximum oxidation resistance is found for FeO NSs with dimensions below 3.2 nm. Rather than being determined by the structure or electronic properties of active sites, the enhanced oxidation resistance originates from the size-dependent structural dynamics of FeO NSs in O2. We find this dynamic size effect to govern the chemical properties of active NSs.

Date: 2017
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DOI: 10.1038/ncomms14459

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