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Ultradispersed Cobalt Ferrite Nanoparticles Assembled in Graphene Aerogel for Continuous Photo-Fenton Reaction and Enhanced Lithium Storage Performance

机译:石墨烯气凝胶中组装的超分散钴铁氧体纳米粒子用于连续的光芬顿反应和增强的锂存储性能

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摘要

The Photo-Fenton reaction is an advanced technology to eliminate organic pollutants in environmental chemistry. Moreover, the conversion rate of Fe3+/Fe2+ and utilization rate of H2O2 are significant factors in Photo-Fenton reaction. In this work, we reported three dimensional (3D) hierarchical cobalt ferrite/graphene aerogels (CoFe2O4/GAs) composites by the in situ growing CoFe2O4 crystal seeds on the graphene oxide (GO) followed by the hydrothermal process. The resulting CoFe2O4/GAs composites demonstrated 3D hierarchical pore structure with mesopores (14~18 nm), macropores (50~125 nm), and a remarkable surface area (177.8 m2 g−1). These properties endowed this hybrid with the high and recyclable Photo-Fenton activity for methyl orange pollutant degradation. More importantly, the CoFe2O4/GAs composites can keep high Photo-Fenton activity in a wide pH. Besides, the CoFe2O4/GAs composites also exhibited excellent cyclic performance and good rate capability. The 3D framework can not only effectively prevent the volume expansion and aggregation of CoFe2O4 nanoparticles during the charge/discharge processes for Lithium-ion batteries (LIBs), but also shorten lithium ions and electron diffusion length in 3D pathways. These results indicated a broaden application prospect of 3D-graphene based hybrids in wastewater treatment and energy storage.
机译:Photo-Fenton反应是一种先进的技术,可以消除环境化学中的有机污染物。此外,Fe 3 + / Fe 2 + 的转化率和H2O2的利用率是光芬顿反应的重要因素。在这项工作中,我们报告了在石墨烯氧化物(GO)上原位生长CoFe2O4晶种,然后进行水热过程的三维(3D)分层铁氧体/石墨烯气凝胶(CoFe2O4 / GAs)复合材料。所得的CoFe2O4 / GAs复合材料表现出3D层级的孔结构,具有中孔(14〜18 nm),大孔(50〜125 nm)和显着的表面积(177.8 m 2 g -1 )。这些特性赋予该杂种以较高的可回收Photo-Fenton活性,可降解甲基橙污染物。更重要的是,CoFe2O4 / GAs复合材料可以在较宽的pH值下保持较高的Photo-Fenton活性。此外,CoFe2O4 / GAs复合材料还表现出优异的循环性能和良好的倍率性能。 3D框架不仅可以有效地防止锂离子电池(LIB)充电/放电过程中CoFe2O4纳米粒子的体积膨胀和聚集,而且可以缩短锂离子和3D路径中的电子扩散长度。这些结果表明,基于3D石墨烯的杂化材料在废水处理和储能方面具有广阔的应用前景。

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