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The fluorine-doped and defects engineered carbon nanosheets as advanced electrocatalysts for oxygen electroreduction
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2020-11-23 , DOI: 10.1016/j.apcatb.2020.119721
Ying Chang , Junxiang Chen , Jingchun Jia , Xiang Hu , Huijuan Yang , Meilin Jia , Zhenhai Wen

We present the scalable salt-templated synthesis of two-dimensional porous fluorine-doped carbon (FC) nanosheets. Due to the larger special surface area (1031 m2 g−1) and high active sites, FC-900 (pyrolyzed at 900 °C) shows impressive oxygen reduction reaction (ORR). The synergistic effect of fluoride doping and defects provides richer density of active sites in these nanosheets. When the samples are further calcined at 900 °C for different hours, the ORR activity of the resulting samples shows a little improvement, indicating the influence of the defects on the ORR performance is much inferior to the doped fluorine. The formation of FC structures is beneficial to the ORR activity, and supported by First-principles density functional theory. The results reveal F dopants and defects important role in efficient ORR electrocatalysis owing to the synergistic effect, which is important for comprehending the origin of ORR, and it is also strong evidence to search advanced carbon-based catalysts.



中文翻译:

掺氟和缺陷工程碳纳米片作为氧电还原的高级电催化剂

我们提出了二维多孔氟掺杂碳(FC)纳米片的可扩展盐模板合成。由于较大的比表面积(1031 m 2  g -1)和高活性位点,FC-900(在900°C下热解)显示出令人印象深刻的氧还原反应(ORR)。氟化物掺杂和缺陷的协同作用在这些纳米片中提供了更丰富的活性位点密度。当样品在900°C下进一步煅烧不同小时时,所得样品的ORR活性显示出少许改善,表明缺陷对ORR性能的影响远不如掺杂氟。FC结构的形成有利于ORR活性,并得到第一原理密度泛函理论的支持。结果表明,由于协同作用,F掺杂剂和缺陷在有效的ORR电催化中起着重要的作用,这对于理解ORR的来源很重要,也是寻找高级碳基催化剂的有力证据。

更新日期:2020-12-05
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