Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (9): 1129-1137.DOI: 10.6023/A21050216 Previous Articles     Next Articles



翟耀a, 辛国祥a,*(), 王佳琦a, 张邦文a, 宋金玲a, 刘晓旭b   

  1. a 内蒙古科技大学材料与冶金学院 包头 014010
    b 河北科技师范学院物理系 秦皇岛 066004
  • 投稿日期:2021-05-16 发布日期:2021-09-17
  • 通讯作者: 辛国祥
  • 基金资助:
    项目受国家自然科学基金(51902085); 内蒙古自治区自然科学基金(2021MS05011); 内蒙古自治区自然科学基金(2020ZD17); 内蒙古自治区自然科学基金(2019MS02023); 河北省自然科学基金(E2019407123); 内蒙古自治区研究生教育创新计划资助.

Microwave-assisted Synthesis of rGO/CeO2 Supercapacitor Electrode Materials with Excellent Electrochemical Properties

Yao Zhaia, Guoxiang Xina(), Jiaqi Wanga, Bangwen Zhanga, Jinling Songa, Xiaoxu Liub   

  1. a School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
    b Department of Physics, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China
  • Received:2021-05-16 Published:2021-09-17
  • Contact: Guoxiang Xin
  • Supported by:
    National Natural Science Foundation of China(51902085); Natural Science Foundation of Inner Mongolia(2021MS05011); Natural Science Foundation of Inner Mongolia(2020ZD17); Natural Science Foundation of Inner Mongolia(2019MS02023); Natural Science Foundation of Hebei Province(E2019407123); Postgraduate Education Innovation Program of Inner Mongolia.

CeO2 possesses excellent pseudocapacitance, nevertheless the electrochemical properties of carbon/CeO2 composites need to be improved. In this paper, reduced graphene oxide (rGO)/CeO2 composite is prepared via a simple microwave-assisted synthesis method. The typical synthesis process is as follows. Firstly, 60 mg of graphene oxide was dissolved into 50 mL of deionized water. Then 20 mL of 0.17 mol•L-1 Ce(NO3)3•6H2O solution was added under ultrasonic conditions. The electrostatic assembly led to the combination of the graphene oxide and Ce(NO3)3. Afterwards, 10 mL of 1.5 mol•L-1 KOH was added dropwise into the mixed solution until the pH value up to 10. The rGO/CeO2 was synthesized in the above-mentioned mixed solution by using the microwave heating method. The heating time was set for 45 s. Repeated the microwave heating process for five times after the solution cooled down to the room temperature. Finally, the rGO/CeO2 was harvested by centrifugation, washing and freeze-drying. The CeO2, in the form of particles, distributes uniformly and conformally on the surface of the corrugated rGO by the morphology observation. The existence of the tiny gaps is displayed between the nano-scaled CeO2 particles. N2 adsorption/desorption analysis suggests that the rGO/CeO2 has large specific area and pores in the mesoporous size, which is helpful to the sufficient contact with the electrolyte. By the electrochemical measurements, the specific capacitance of the rGO/CeO2 is as high as 468 F•g-1 and the capacity retention is up to 107.3% after 10000 charge/discharge cycles. The excellent cycling stability is attributed to the good synergistic effect between the rGO with large specific area and the CeO2 with uniform and thin layer, which decreases the resistance of ion transport, and the tiny gaps between CeO2 particles, which mitigates the lattice expansion during the transformation from Ce4+ to Ce3+. The energy density of the assembled symmetrical supercapacitor rGO/CeO2||rGO/CeO2 reaches 18.16 Wh•kg-1. As a supercapacitor electrode material, the rGO/CeO2 has wide prospect.

Key words: microwave, graphene, cerium oxide, supercapacitor, electrochemistry