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DOI | 10.1126/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
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ISSN | 0036-8075 |
EISSN | 1095-9203 |
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 |
URL | 查看原文 |
引用统计 | |
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 |
推荐引用方式 GB/T 7714 | 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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