Pei Jiayun, Zhao Haiyan, Yang Fan, Yan Dong
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China.
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, P. R. China.
Langmuir. 2021 May 25;37(20):6132-6138. doi: 10.1021/acs.langmuir.1c00108. Epub 2021 May 13.
The combination of graphene oxide (GO) and iron oxide (FeO) may induce property enforcement and application extension. Herein, GO/FeO nanocomposites were synthesized via the vacuum-freeze-drying method and used for the thermal decomposition of ammonium perchlorate (AP). A series of characterization techniques were applied to elucidate the as-obtained nanomaterial's physicochemical properties. These results show that the treated GO is consistent with the pristine GO after the freeze-drying treatment. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analyses show that iron oxide nanoparticles are anchored on and between the GO sheets. The catalytical effect investigation on AP with different FeO: GO ratios indicates that the high-temperature decomposition temperature of AP could be decreased by a temperature as high as 77 °C compared to pure AP accompanied by 3 wt % GO/FeO nanocomposite which proves the high catalytic performance of the nanocomposites. The first-principles calculation was employed to elaborate the synergistic effect, and the findings demonstrate that the presence of graphene in the catalyst can enhance the catalytic effect via reducing the activation energy barrier by ∼17% in the reaction of AP thermal decomposition.
氧化石墨烯（GO）和氧化铁（FeO）的组合可能会导致性能增强和应用扩展。在此，通过真空冷冻干燥法合成了GO/FeO纳米复合材料，并将其用于高氯酸铵（AP）的热分解。应用了一系列表征技术来阐明所获得的纳米材料的物理化学性质。这些结果表明，经过冷冻干燥处理后，处理过的GO与原始GO一致。透射电子显微镜（TEM）和扫描电子显微镜（SEM）分析表明，氧化铁纳米颗粒锚定在GO片层上和片层之间。对不同FeO:GO比例的AP的催化效果研究表明，与纯AP相比，伴随着3 wt%的GO/FeO纳米复合材料，AP的高温分解温度可降低高达77°C，这证明了纳米复合材料具有高催化性能。采用第一性原理计算来阐述协同效应，研究结果表明，催化剂中石墨烯的存在可以通过在AP热分解反应中将活化能垒降低约17%来增强催化效果。
