Oxidizing Vacancies in Nitrogen‐Doped Carbon Enhance Air‐Cathode Activity,Advanced Materials

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Oxidizing Vacancies in Nitrogen‐Doped Carbon Enhance Air‐Cathode Activity
Advanced Materials ( IF 27.4 ) Pub Date : 2018-12-05 , DOI: 10.1002/adma.201803339
Mengfan Wang ₁ , Weipeng Wang ₂ , Tao Qian ₁ , Sisi Liu ₁ , Yutao Li ₃ , Zhufeng Hou ₄ , John B. Goodenough ₃ , Pulickel M. Ajayan ₂ , Chenglin Yan ₁

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Oxidizing vacancies in nitrogen‐doped carbon have recently been reported to enhance the oxygen reaction activity of air cathodes, but their specific role has remained elusive and controversial. Herein, the critical role of oxidizing the vacancies in enhancing the oxygen reduction reaction for metal–air battery is identified with density functional theory. Deliberate introduction of oxygen‐enriched vacancies in nitrogen‐doped carbon is shown experimentally to provide superior oxygen reduction activity. In situ X‐ray powder diffraction gives direct observation of the oxygen reactions in a zinc–air battery catalyzed by vacancy‐enriched oxidized carbon; the intensity changes of the carbon peak show continuous chemisorption of oxygen intermediates on the carbon cathode during discharge. The air‐cathode performance is shown to exceed that with Pt/C+IrO₂ catalysts.

中文翻译：

氮掺杂碳中的氧化空位增强了空气阴极的活性

最近有报道称，氮掺杂碳中的氧化空位可增强空气阴极的氧反应活性，但其具体作用仍然难以捉摸和有争议。在此，通过密度泛函理论确定了氧化空位在增强金属-空气电池的氧还原反应中的关键作用。实验表明，在掺氮碳中故意引入富氧空位可提供出色的氧还原活性。原位X射线粉末衍射可直接观察到富含空位的氧化碳催化的锌空气电池中的氧反应；碳峰的强度变化表明在放电过程中氧中间体在碳阴极上的连续化学吸附。空气阴极性能显示超过Pt / C + IrO_2种催化剂。

更新日期：2018-12-05

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