Evidence map›Paper›PMID 34567505›Full record

ArticleChemical science2021

Degradation and regeneration of Fe-N

Dongsheng Xia, Chenchen Yu, Yinghao Zhao, Yinping Wei, Haiyan Wu, Yongqiang Kang, Jia Li, Lin Gan, Feiyu Kang

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Chemical science, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

7 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Dongsheng XiaInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Chenchen YuInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Yinghao ZhaoInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Yinping WeiInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Haiyan WuInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Yongqiang KangInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.ORCID https://orcid.org/0000-0003-4418-2347
Jia LiInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.
Lin GanInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.ORCID https://orcid.org/0000-0003-3486-6016
Feiyu KangInstitute of Materials Research and Shenzhen Geim Graphene Research Centre, Tsinghua Shenzhen International Graduate School, Tsinghua University Shenzhen 518055 P. R. China li.jia@sz.tsinghua.edu.cn lgan@sz.tsinghua.edu.cn fykang@mail.tsinghua.edu.cn.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The severe degradation of Fe-N-C electrocatalysts during a long-term oxygen reduction reaction (ORR) has become a major obstacle for application in proton-exchange membrane fuel cells. Understanding the degradation mechanism and regeneration of aged Fe-N-C catalysts would be of particular interest for extending their service life. Herein, we show that the by-product hydrogen peroxide during the ORR not only results in the oxidation of the carbon surface but also causes the demetallation of Fe active sites. Quantitative analysis reveals that the Fe demetallation constitutes the main reason for catalyst degradation, while previously reported carbon surface oxidation plays a minor role. We further reveal that post thermal annealing of the aged catalysts can transform the oxygen functional groups on the carbon surface into micropores. These newly formed micropores not only help to increase the active-site density but also the intrinsic ORR activity of the neighbouring Fe-N

Identifiers

PMID34567505
PMCPMC8409490

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.