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首页> 外文期刊>New Journal of Chemistry >Core-shell structured nanoporous N-doped carbon decorated with embedded Co nanoparticles as bifunctional oxygen electrocatalysts for rechargeable Zn-air batteries
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Core-shell structured nanoporous N-doped carbon decorated with embedded Co nanoparticles as bifunctional oxygen electrocatalysts for rechargeable Zn-air batteries

机译：核壳结构纳米多孔N掺杂碳用嵌入式CO纳米颗粒装饰，作为用于可充电Zn-Air电池的双官能氧气催化剂

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摘要

Exploiting highly active and low-cost electrocatalysts is imperative and challenging for developing advanced energy storage and conversion devices. Herein, we report a core-shell structured carbon hybrid (PNC@CoNC) as an effective bifunctional oxygen catalyst prepared by a surface polymerization strategy and a subsequent pyrolysis process, consisting of nanoporous N-doped carbon core carbonized from ZIF-8 and N-doped graphitic carbon shell with embedded Co nanoparticles carbonized from the cobalt ion-doped polydopamine coating layer. The desirable nanoarchitecture endows the hybrid with a high specific surface area of 531 m(2) g(-1), high conductivity, abundant micro-/meso-pores and electrocatalytically active N-dopant species. As a result, the hybrid PNC@CoNC displays a positive half-wave potential of 0.81 V towards oxygen reduction and a low overpotential of 490 mV at 10 mA cm(-2) towards oxygen evolution in alkaline electrolytes, as well as excellent electrochemical stability. The bifunctional oxygen activity is comparable with that of the commercial catalysts and the recently reported electrocatalysts. Expectedly, as an air-electrode catalyst in rechargeable Zn-air battery (ZAB), PNC@CoNC shows a high power density of 130 mW cm(-2), a low charge/discharge voltage gap, and superior cycling stability. Additionally, the as-prepared hybrid also shows promising application potential in solid-state ZAB. Therefore, this work provides a lesson for the synthesis of non-noble metal electrocatalysts in advanced new energy devices.
机译：开发高活性、低成本的电催化剂对于开发先进的储能和转换设备来说是当务之急和挑战。在此，我们报道了一种核壳结构的碳杂化材料(PNC@CoNC)作为一种有效的双功能氧催化剂，通过表面聚合策略和随后的热解过程制备，由ZIF-8碳化的纳米多孔N掺杂碳芯和N掺杂石墨碳壳以及从钴离子掺杂的聚多巴胺涂层碳化的嵌入钴纳米颗粒组成。理想的纳米结构赋予该杂化物531 m（2）g（-1）的高比表面积、高导电性、丰富的微/介孔和电催化活性N-掺杂物种。因此，混合动力车PNC@CoNC在碱性电解液中，氧气还原的半波正电位为0.81 V，在10 mA-cm（-2）下析氧的过电位为490 mV，以及良好的电化学稳定性。双功能氧活性与商业催化剂和最近报道的电催化剂相当。作为锌空气二次电池（ZAB）中的空气电极催化剂，PNC@CoNC显示了130 mW cm（-2）的高功率密度、低充电/放电电压间隙和优异的循环稳定性。此外，所制备的杂化材料在固态ZAB中也显示出良好的应用潜力。因此，这项工作为在先进的新能源设备中合成非贵金属电催化剂提供了经验。

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  • 来源
    《New Journal of Chemistry》 |2021年第5期|共5页
  • 作者

    Chen Xiaowen; Gao Jingxia; Wang Luyuan; Zhu Ping; Zhao Xinsheng; Wang Guoxiang; Liu Sa;

  • 作者单位

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Phys &

    Elect Engn Xuzhou 221116 Jiangsu Peoples R China;

    Dalian Polytech Univ Sch Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Xuzhou 221116 Jiangsu Peoples R China;

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