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首页> 外文期刊>Applied Surface Science >Tunable oxidation state of Co in CoOx@N-doped graphene derived from PANI/Co_3O_4 and the enhanced oxygen reduction catalysis
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Tunable oxidation state of Co in CoOx@N-doped graphene derived from PANI/Co_3O_4 and the enhanced oxygen reduction catalysis

机译：PANI / Co_3O_4衍生的CoOx @ N掺杂石墨烯中Co的可调节氧化态和增强的氧还原催化作用

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摘要

Metal@nitrogen-doped carbon core-shell structure, processing both the stability of inner metal species and manipulated electron structure of outer carbons, is regarded as a promising catalysts for oxygen reduction reaction. In the traditional fabrication of such materials, metal ions are reduced into metallic particles, which make it hard to control oxidation state of metals. In this work, we report tunable oxidation state of Co in CoOx@N-doped graphene simply by changing the pyrolysis temperature of Co3O4/polyaniline. Under high temperature, polyaniline decompose and release various organic gases, which can partially reduce Co3O4 and serve as gaseous precursors for the in-situ growth of graphene in the meantime. The balance of these two reactions is crucial to control the oxidation state of Co. Thus, its catalytic activity towards oxygen reduction reaction can be easily tuned by inner CoOx core with different electron structure.
机译：金属@氮掺杂的碳核-壳结构，既处理内部金属物种的稳定性，又处理外部碳的受控电子结构，被认为是氧还原反应的有前途的催化剂。在这种材料的传统制造中，金属离子被还原成金属颗粒，这使得难以控制金属的氧化态。在这项工作中，我们仅通过改变Co3O4 /聚苯胺的热解温度即可报告Co在CoOx @ N掺杂的石墨烯中的可调氧化态。在高温下，聚苯胺分解并释放出各种有机气体，这些有机气体可以部分还原Co3O4，并同时用作石墨烯原位生长的气态前体。这两个反应的平衡对于控制Co的氧化状态至关重要。因此，通过具有不同电子结构的内部CoOx核可以轻松地调节其对氧还原反应的催化活性。

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