Nitrogen-doped graphite encapsulated Fe/Fe3C nanoparticles and carbon black for enhanced performance towards oxygen reduction
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第11期
论文作者：Jie Zhu Zewei Xiong Jiming Zheng Zhihong Luo Guangbin Zhu Chao Xiao Zhengbing Meng Yibing Li Kun Luo
文章页码：2543 - 2551
摘 要：Non-noble metal（NNM） catalysts have recently attracted intensive interest for their high catalytic performance towards oxygen reduction reaction（ORR） at low cost.Herein,a novel NNM catalyst was synthesized by the simple pyrolysis of carbon black,urea and a Fe-containing precursor,which exhibits excellent ORR catalytic activity,superior durability and methanol tolerance versus the Pt/C catalyst in both alkaline and acidic solutions.Scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and X-ray diffraction（XRD） characterizations demonstrate that the product is a nitrogen-doped hybrid of graphite encapsulated Fe/Fe3C nanoparticles and carbon black.X-ray photoelectron spectrum（XPS） and electrochemical analyses indicate that the catalytic performance and chemical stability correlate closely with a nitrogen-rich layer on the Fe/Fe3C nanoparticle after pyrolysis with presence of urea,leading to the same four-electron pathway towards ORR as the Pt/C catalyst.The hybrid is prospective to be an efficient ORR electrocatalyst for direct methanol fuel cells with high catalytic performance at low cost.
Jie Zhu1，Zewei Xiong1，Jiming Zheng1，Zhihong Luo1，Guangbin Zhu1，Chao Xiao1，Zhengbing Meng1，Yibing Li1，Kun Luo2
1. College of Materials Science and Engineering,Guilin University of Technology2. School of Materials Science and Engineering,Changzhou University
摘 要：Non-noble metal（NNM） catalysts have recently attracted intensive interest for their high catalytic performance towards oxygen reduction reaction（ORR） at low cost.Herein,a novel NNM catalyst was synthesized by the simple pyrolysis of carbon black,urea and a Fe-containing precursor,which exhibits excellent ORR catalytic activity,superior durability and methanol tolerance versus the Pt/C catalyst in both alkaline and acidic solutions.Scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and X-ray diffraction（XRD） characterizations demonstrate that the product is a nitrogen-doped hybrid of graphite encapsulated Fe/Fe3C nanoparticles and carbon black.X-ray photoelectron spectrum（XPS） and electrochemical analyses indicate that the catalytic performance and chemical stability correlate closely with a nitrogen-rich layer on the Fe/Fe3C nanoparticle after pyrolysis with presence of urea,leading to the same four-electron pathway towards ORR as the Pt/C catalyst.The hybrid is prospective to be an efficient ORR electrocatalyst for direct methanol fuel cells with high catalytic performance at low cost.
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