GSTDTAP  > 地球科学
DOI10.1126/science.aan2255
Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst
Chung, Hoon T.1; Cullen, David A.2; Higgins, Drew1; Sneed, Brian T.3; Holby, Edward F.4; More, Karren L.3; Zelenay, Piotr1
2017-08-04
发表期刊SCIENCE
ISSN0036-8075
EISSN1095-9203
出版年2017
卷号357期号:6350页码:479-483
文章类型Article
语种英语
国家USA
英文摘要

Platinum group metal-free (PGM-free) metal-nitrogen-carbon catalysts have emerged as a promising alternative to their costly platinum (Pt)-based counterparts in polymer electrolyte fuel cells (PEFCs) but still face some major challenges, including (i) the identification of the most relevant catalytic site for the oxygen reduction reaction (ORR) and (ii) demonstration of competitive PEFC performance under automotive-application conditions in the hydrogen (H2)-air fuel cell. Herein, we demonstrate H2-air performance gains achieved with an iron-nitrogen-carbon catalyst synthesized with two nitrogen precursors that developed hierarchical porosity. Current densities recorded in the kinetic region of cathode operation, at fuel cell voltages greater than similar to 0.75 V, were the same as those obtained with a Pt cathode at a loading of 0.1 milligram of Pt per centimeter squared. The proposed catalytic active site, carbon-embedded nitrogen-coordinated iron (FeN4), was directly visualized with aberration-corrected scanning transmission electron microscopy, and the contributions of these active sites associated with specific lattice-level carbon structures were explored computationally.


领域地球科学 ; 气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000406840100032
WOS关键词OXYGEN REDUCTION REACTION ; NONPRECIOUS METAL CATALYST ; NITROGEN-DOPED GRAPHENE ; PEM FUEL-CELL ; CATHODE CATALYSTS ; CARBON ; IRON ; ELECTROCATALYSTS ; POLYANILINE ; ELECTROREDUCTION
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/196598
专题地球科学
资源环境科学
气候变化
作者单位1.Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA;
2.Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA;
3.Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA;
4.Los Alamos Natl Lab, Sigma Div, Oak Ridge, TN 37831 USA
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Chung, Hoon T.,Cullen, David A.,Higgins, Drew,et al. Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst[J]. SCIENCE,2017,357(6350):479-483.
APA Chung, Hoon T..,Cullen, David A..,Higgins, Drew.,Sneed, Brian T..,Holby, Edward F..,...&Zelenay, Piotr.(2017).Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst.SCIENCE,357(6350),479-483.
MLA Chung, Hoon T.,et al."Direct atomic-level insight into the active sites of a high-performance PGM-free ORR catalyst".SCIENCE 357.6350(2017):479-483.
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