Metal-organic-frameworks derived cobalt embedded in various carbon structures as bifunctional electrocatalysts for oxygen reduction and evolution reactions.
Metal-organic-frameworks derived cobalt embedded in various carbon structures as bifunctional electrocatalysts for oxygen reduction and evolution reactions.
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DOI：
10.1038/s41598-017-05636-y
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发表时间：
2017-07-13
影响因子：
4.6
通讯作者：
Xia Y
中科院分区：
文献类型：
--
作者：
Chen B;Ma G;Zhu Y;Xia Y
以金属有机骨架ZIF-67为碳源，通过一步碳化法制备了一系列钴嵌入氮掺杂纳米多孔碳、碳纳米管或空心碳洋葱中的纳米复合材料。详细研究了碳化温度对所得纳米复合材料结构演变的影响。在所合成的材料中，钴/纳米多孔N掺杂碳复合材料在碱性介质中对氧还原反应表现出优异的电催化活性和耐久性。与基准Pt/C催化剂相比，优化的Co@C-800（在800 °C下焙烧）表现出高的氧还原反应活性，起始电位为0.92 V，半波电位为0.82 V。此外，优化的Co@C-800还显示出对水裂解析氧反应的增强的电催化活性，具有1.43 V的低起始电位和10 mA cm-2电流密度下的1.61 V的电位。这项工作提供了一个简单的解决方案，以开发金属有机框架衍生的材料，用于高效的电化学应用。
A series of nanocomposites of cobalt embedded in N-doped nanoporous carbons, carbon nanotubes or hollow carbon onions have been synthesized by a one-step carbonization of metal-organic-framework ZIF-67. The effect of the carbonization temperature on the structural evolution of the resulting nanocomposites has been investigated in detail. Among the as-synthesized materials, the cobalt/nanoporous N-doped carbon composites have demonstrated excellent electrocatalytic activities and durability towards oxygen reduction reaction in alkaline medium. Compared to the benchmark Pt/C catalyst, the optimized Co@C-800 (carbonized at 800 °C) exhibited high oxygen reduction reaction activity with an onset potential of 0.92 V, and a half-wave potential of 0.82 V. Moreover, the optimized Co@C-800 also showed enhanced electrocatalytic activity towards oxygen evolution reaction from water splitting, with a low onset potential of 1.43 V and a potential of 1.61 V at 10 mA cm−2 current density. This work offered a simple solution to develop metal-organic-framework-derived materials for highly efficient electrochemical applications.
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