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首页> 外文期刊>RSC Advances >Co3O4 nanoparticles/cellulose nanowhiskers-derived amorphous carbon nanoneedles: sustainable materials for supercapacitors and oxygen reduction electrocatalysis
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Co3O4 nanoparticles/cellulose nanowhiskers-derived amorphous carbon nanoneedles: sustainable materials for supercapacitors and oxygen reduction electrocatalysis

机译：Co3O4纳米颗粒/纤维素纳米晶须衍生的无定形碳纳米针：超级电容器和氧还原电催化的可持续材料

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摘要

Hybrid nanostructured materials comprised of amorphous carbon nanoneedles (CNN)-supported Co3O4 nanoparticles (Co3O4-CNN) were synthesized. The synthesis involved layer-by-layer nanocasting of cellulose nanowhiskers with precursors of cobalt oxide and silica, followed by pyrolysis of the core-shell-shell composite materials and etching of the outer silica shells from the carbonized materials. Notably, cotton-derived cellulose nanowhiskers were used as the carbon precursors, and also as the hard templates for needle-shaped carbons, in the synthesis. The effectiveness of the core-shell-shell nanoreactors, possessing the silica shell-entrapped cellulose nanowhiskers and Co(II) ions, in generating organized carbon nanomaterials with metal oxide nanoparticles, or otherwise, as a function of the loading of Co(II) ions was evaluated. Details of the synthetic method and the different materials in terms of composition and morphology it results in as a function of the relative amount of metal ions have also been discussed. The materials showed promising supercapacitive properties and electrocatalytic activity for the oxygen reduction reaction (ORR). The materials' double layer capacitance and performance for ORR electrocatalysis as a function of their Co3O4 content and particles size have also been discussed. The results indicated that the electrochemical properties of these hybrid materials are strongly related to the morphology of their carbon nanostructures. The synthetic method demonstrated here can potentially serve as a facile route to produce other metal oxide/carbon nanomaterials, with different morphologies and similar or better properties, using other carbon precursors.
机译：合成了由无定形碳纳米针（CNN）负载的Co3O4纳米颗粒（Co3O4-CNN）组成的杂化纳米结构材料。合成过程包括用氧化钴和二氧化硅的前体对纤维素纳米晶须进行逐层纳米铸造，然后将核-壳-壳复合材料热解，并从碳化材料中蚀刻出外部二氧化硅壳。值得注意的是，在合成中，棉衍生的纤维素纳米晶须被用作碳前体，并且还用作针状碳的硬模板。具有二氧化硅壳包裹的纤维素纳米晶须和Co（II）离子的核-壳-壳纳米反应器在产生具有金属氧化物纳米粒子的有组织碳纳米材料中的效率，或者作为Co（II）负载量的函数对离子进行了评估。还讨论了合成方法和不同材料在组成和形态方面取决于金属离子相对量的函数的细节。该材料对氧还原反应（ORR）具有良好的超电容性能和电催化活性。还讨论了材料的双层电容和ORR电催化性能随其Co3O4含量和粒径的变化。结果表明，这些杂化材料的电化学性质与其碳纳米结构的形态密切相关。此处展示的合成方法可以潜在地用作使用其他碳前体生产其他形态，相似或更好性能的其他金属氧化物/碳纳米材料的便捷途径。

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