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Nitrogen-Deficient ORR Active Sites Formation by Iron-Assisted Water Vapor Activation of Electrospun Carbon Nanofibers
Jeong, Beomgyun; Shin, Dongyoon; Choun, Myounhoon; Maurya, Sandip; Baik, Jaeyoon; Mun, Bongjin Simon; Moon, Seung-Hyeon; Su, Dangsheng; Lee, Jaeyoung; Lee, J (reprint author), GIST, SESE, Gwangju 500712, South Korea.; Lee, J (reprint author), GIST, Ertl Ctr Electrochem & Catalysis, SESE, Gwangju 500712, South Korea.
2016-04-14
发表期刊JOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
卷号120期号:14页码:7705-7714
摘要Fe- and N-modified carbon nanofibers (Fe-CNF) were synthesized via electrospinning and pyrolysis as electrocatalysts for oxygen reduction reaction (ORR). In order to increase the exposed surface area with the active sites buried inside Fe CNF, we attempted water vapor activation for Fe CNF and observed a substantial improvement of ORR activity up to the comparable level with Pt/C. Unlike what was expected, however, water vapor activation did not significantly increase the specific surface area of Fe CNF; instead, it induced a depletion of surface N content, which makes it difficult to explain the improved ORR activity with the increase of surface area with N-based active sites. In water vapor activation, the chemical phase of embedded particles is changed from Fe3C to Fe3O4 and nitrogen-free Fe and C-based ORR active sites were exposed, which seemed to be related with hierarchical macro/mesopore structure and graphitic edge defects. This study demonstrates a facile activation method for better ORR activity of Fe-modified CNF and suggests a potential relationship of surface carbon structure with the catalytic activity toward ORR rather than the type and concentration of N in Fe CNF, which should be investigated further.
部门归属[jeong, beomgyun ; shin, dongyoon ; choun, myounhoon ; maurya, sandip ; moon, seung-hyeon ; lee, jaeyoung] gist, sese, gwangju 500712, south korea ; [mun, bongjin simon] gist, dept phys & photon sci, gwangju 500712, south korea ; [mun, bongjin simon ; moon, seung-hyeon ; su, dangsheng ; lee, jaeyoung] gist, ertl ctr electrochem & catalysis, sese, gwangju 500712, south korea ; [baik, jaeyoon] pohang univ sci & technol, pohang accelerator lab, pohang 37673, south korea ; [su, dangsheng] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china
学科领域Chemistry ; Science & Technology - Other Topics ; Materials Science
资助者New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP); Ministry of Trade, Industry & Energy, Republic of Korea [20153030031720]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75911
专题中国科学院金属研究所
通讯作者Lee, J (reprint author), GIST, SESE, Gwangju 500712, South Korea.; Lee, J (reprint author), GIST, Ertl Ctr Electrochem & Catalysis, SESE, Gwangju 500712, South Korea.
推荐引用方式
GB/T 7714
Jeong, Beomgyun,Shin, Dongyoon,Choun, Myounhoon,et al. Nitrogen-Deficient ORR Active Sites Formation by Iron-Assisted Water Vapor Activation of Electrospun Carbon Nanofibers[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2016,120(14):7705-7714.
APA Jeong, Beomgyun.,Shin, Dongyoon.,Choun, Myounhoon.,Maurya, Sandip.,Baik, Jaeyoon.,...&Lee, J .(2016).Nitrogen-Deficient ORR Active Sites Formation by Iron-Assisted Water Vapor Activation of Electrospun Carbon Nanofibers.JOURNAL OF PHYSICAL CHEMISTRY C,120(14),7705-7714.
MLA Jeong, Beomgyun,et al."Nitrogen-Deficient ORR Active Sites Formation by Iron-Assisted Water Vapor Activation of Electrospun Carbon Nanofibers".JOURNAL OF PHYSICAL CHEMISTRY C 120.14(2016):7705-7714.
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