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首页> 外文期刊>Journal of industrial and engineering chemistry >Bimetallic ZIFs derived nitrogen-doped hollow carbon with carbon nanotube bridges as a superior oxygen reduction reaction electrocatalyst
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Bimetallic ZIFs derived nitrogen-doped hollow carbon with carbon nanotube bridges as a superior oxygen reduction reaction electrocatalyst

机译：双金属Zifs通过碳纳米管桥衍生氮气掺杂的中空碳作为优异的氧还原反应电催化剂

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The development of oxygen reduction reaction (ORR) catalysts is critical for energy conversion technologies such as fuel cells. This paper proposes an approach to synthesize a hollow-sphere nitrogen-doped carbon shell loaded with cobalt nanoparticles derived from a polystyrene@bimetallic zeolitic imidazolate framework (PS@BMZIF) core@shell, which exhibits high activity as an ORR catalyst. The ORR activity can be enhanced by performing carbonization in the presence of hydrogen, resulting in the growth of additional carbon nanotubes on the hollow-sphere porous carbon shell (h_CoNC/CNT) derived from the PS@BMZIF. The electrocatalyst obtained exhibits excellent ORR activity with a half-wave potential of 0.894 V and long-term stability for 5000 cycles in alkaline media. The h_CoNC/CNT catalyst is applied to the membrane electrode assembly of an anion exchange membrane fuel cell, where it demonstrates a performance of 140 mA/cm(2) at 0.6 V and 133 mW/cm(2) at the maximum power density and improves mass transfer. The exceptional electrochemical properties of h_CoNC/CNT can be attributed to its desirable hollow-sphere structure with CNTs and the adjustment of efficient active sites of the nitrogen-doped porous material. These findings suggest a potential approach by which to select the structure of the ZIFs and control the pyrolysis condition for ZIF-derived ORR electrocatalysts. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：氧还原反应（ORR）催化剂的开发对燃料电池等能量转换技术至关重要。本文提出了一种制备空心球氮掺杂碳壳的方法，该碳壳中负载了由碳纳米管衍生的钴纳米颗粒polystyrene@bimetallic沸石咪唑盐骨架(PS@BMZIF) core@shell，作为ORR催化剂表现出高活性。通过在氢气存在下进行碳化，可以增强ORR活性，从而在由该碳源衍生的空心球形多孔碳壳（h_-CoNC/CNT）上生长额外的碳纳米管PS@BMZIF.所制备的电催化剂具有良好的ORR活性，半波电位为0.894V，在碱性介质中可长期稳定5000次循环。将h_-CoNC/CNT催化剂应用于阴离子交换膜燃料电池的膜电极组件上，在0.6V和133MW/cm（2）的最大功率密度下，其表现为140mA/cm（2）的性能，并改善了传质。h_-CoNC/CNT优异的电化学性能可归因于其理想的空心球结构和氮掺杂多孔材料有效活性中心的调整。这些发现为选择ZIF的结构和控制ZIF衍生ORR电催化剂的热解条件提供了一种潜在的方法。（2021）韩国工业和工程化学学会。由爱思唯尔B.V.出版。版权所有。

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