Graphene-Directed Formation of a Nitrogen-Doped Porous Carbon Sheet with High Catalytic Performance for the Oxygen Reduction Reaction,The Journal of Physical Chemistry C

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Graphene-Directed Formation of a Nitrogen-Doped Porous Carbon Sheet with High Catalytic Performance for the Oxygen Reduction Reaction
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.jpcc.7b12327
Lei Qin _{1,

2} , Yifei Yuan ₃ , Wei Wei _{4,

5} , Wei Lv ₁ , Shuzhang Niu ₁ , Yan-Bing He ₁ , Dengyun Zhai ₁ , Feiyu Kang ₁ , Jang-Kyo Kim ₂ , Quan-Hong Yang ₄ , Jun Lu ₃

Affiliation

A nitrogen (N)-doped porous carbon sheet is prepared by in situ polymerization of pyrrole on both sides of graphene oxide, following which the polypyrrole layers are then transformed to the N-doped porous carbon layers during the following carbonization, and a sandwich structure is formed. Such a sheet-like structure possesses a high specific surface area and, more importantly, guarantees the sufficient utilization of the N-doping active porous sites. The internal graphene layer acts as an excellent electron pathway, and meanwhile, the external thin and porous carbon layer helps to decrease the ion diffusion resistance during electrochemical reactions. As a result, this sandwich structure exhibits prominent catalytic activity toward the oxygen reduction reaction in alkaline media, as evidenced by a more positive onset potential, a larger diffusion-limited current, better durability and poison-tolerance than commercial Pt/C. This study shows a novel method of using graphene to template the traditional porous carbon into a two-dimensional, thin, and porous carbon sheet, which greatly increases the specific surface area and boosts the utilization of inner active sites with suppressed mass diffusion resistance.

中文翻译：

石墨烯定向形成具有高催化性能的氮掺杂多孔碳薄板，用于氧还原反应

通过在氧化石墨烯的两面上进行吡咯的原位聚合制备氮（N）掺杂的多孔碳片，然后在随后的碳化过程中将聚吡咯层转化为氮掺杂的多孔碳层，并形成三明治结构形成了。这种片状结构具有高的比表面积，更重要的是，保证了充分利用N掺杂活性多孔位点。内部石墨烯层充当极好的电子通道，同时，外部薄而多孔的碳层有助于降低电化学反应过程中的离子扩散阻力。结果，这种夹层结构对碱性介质中的氧还原反应显示出显着的催化活性，这由更正的起始电位所证明，与市售Pt / C相比，具有更大的扩散极限电流，更好的耐用性和抗毒性。这项研究显示了一种使用石墨烯将传统多孔碳模板化为二维，薄且多孔的碳片的新方法，该方法极大地增加了比表面积，并在抑制质量扩散阻力的情况下提高了内部活性位的利用率。

更新日期：2017-12-28

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