铁氧化物因较高的理论比电容、稳定的电化学性质及廉价易得的原料,在储能领域受到了越来越多关注。将铁箔置于氧化石墨烯水分散液中,利用其中酸性环境使铁箔释放出Fe2+,同时与氧化石墨烯结合形成复合物,所得产物经冷冻干燥再经退火处理后得到Fe3O4纳米颗粒/石墨烯复合材料。对其结构形貌和化学成分进行了系统表征,结果表明,Fe3O4纳米颗粒均匀分散在石墨烯骨架中,卷曲的石墨烯则粘连、缠绕或包覆着Fe3O4纳米颗粒,产生良好复合,避免两种成分严重聚集,石墨烯含量约为21.5%。这种独特的形貌结构使之作为超级电容器电极材料具有出色的电化学性能。三电极体系下,Fe3O4纳米颗粒/石墨烯复合材料最大比电容为221.8F/g,同时倍率性质优异。此外,以其作为活性成分组装出对称超级电容器,在功率密度250W/kg下的最大能量密度达到1.76W·h/kg;并且有着优异的倍率表现和循环稳定性,在2A/g高电流密度下反复充放电5000次后的电容损失率仅为13.6%;亦可用作电源对小型电子设备(如计时器、LED灯珠)供能,展现出巨大的应用潜能与储能优势。
Due to the high theoretical capacitance,stable electrochemical properties and abundant raw materials,iron oxides have attracted more and more attention in the field of energy storage.In this work,by using the intrinsic acidic environment,Fe2+ could be released from iron foil by immersing it into an aqueous solution of graphene oxide (GO).Meanwhile,the resulting Fe2+ was hybridized with GO sheets to form an intermediate composite,which underwent freeze-drying and annealing to yield the final product of Fe3O4 nanoparticle/graphene composite.The chemical composition and structure of the composite were systematically characterized.The results showed that Fe3O4 nanoparticles were adhered,wrapped or interwined by wrinkled graphene sheets,leading to the uniform distribution in the matrix.Such two components freed from serious aggregation,with the graphene content of approximately 21.5%.The unique structural and morphological features endowed Fe3O4 nanoparticle/graphene composite with commendable supercapacitive properties.In a three-electrode system,the highest specific capacitance of Fe3O4 nanoparticle/graphene composite was 221.8F/g with remarkable rate performance.Furthermore,a symmetric supercapacitor device was also constructed with it as the active component,which released the maximum energy density of 1.62W·h/kg at power density of 250W/kg and displayed outstanding rate capability as well as long-term cycling stability.For instance,the capacitance loss was merely 13.6% after consecutively charging/discharging at a current density of 2A/g for over 5000 cycles.Moreover,the currently developed supercapacitor devices were able to be used as power source to drive some commercial electronic products such as timer,LED beads and so on,demonstrating the satisfactory application potential and energy storage advantages.
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基金资助
重庆市教委科学技术研究项目(KJZD-K202301306);重庆文理学院重大培育项目(P2020CL02);重庆文理学院2024年研究生科研创新项目(CUAS-GSG2024020)
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