Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (06): 957-961.DOI: 10.6023/A12121066 Previous Articles     Next Articles



鲁振江a, 徐茂文b, 包淑娟a,b, 柴卉a   

  1. a 新疆大学应用化学研究所 洁净能源材料与技术省部共建重点实验室 乌鲁木齐 830046;
    b 西南大学洁净能源与先进材料研究院 重庆北碚 400715
  • 投稿日期:2012-12-18 发布日期:2013-04-03
  • 通讯作者: 包淑娟,; Tel.: 0086-023-68254943
  • 基金资助:

    项目受新疆自然科学基金(No. 2011211A001)资助.

Preparation and Oxygen Reduction Performance of GNs-MnO2 composite

Lu Zhenjianga, Xu Maowenb, Bao Shujuana,b, Chai Huia   

  1. a Key Laboratory of Material and Technology for Clean Energy, Ministry of Education; Institute of Applied Chemistry, Xinjiang University, Urumqi 830046;
    b Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing 400715
  • Received:2012-12-18 Published:2013-04-03
  • Supported by:

    Project supported by the Natural Science Foundation of Xinjiang Uyghur Autonomous Region (No. 2011211A001).

As a single layer of carbon atoms covalently bonded into a hexagonal lattice, graphene exhibits a wide range of fascinating physical properties, such as remarkable charge-carrier mobility, unique graphitic basal plane structure, excellent conductivity, and a high surface area. These properties lead to very promising applications of graphene in electronic devices, catalysts, and energy-storage devices. In this work, the MnO2 and GNs-MnO2 composites were prepared by an in situ redox reaction of graphene (GNs) with KMnO4. The microstructure and morphology of the as-prepared materials were characterized by using X-ray diffraction (XRD), Raman measurements, thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller spectrometry (BET). The results show the obtained MnO2 uniformly anchored on the surface of graphene sheets and increased its specific surface area, which could enhance the electrochemically active surface area and utilization of MnO2. The GNs content of the GNs-MnO2 composites is caculated by according to TG analysis of the product, which reach to 36.2%. The electrocatalytic properties of the GNs-MnO2 and pure MnO2 electrodes are investigated for oxygen reduction reaction by cyclic voltammetry, linear sweep voltammetry (LSV) and rotating disk electrode (RDE) measurements. It is found that the obtained GNs-MnO2 electrocatalyst show superior electrocatalytic activity toward the oxygen reduction reaction (ORR) in alkaline electrolytes via a two-electron pathway. The half-wave potential of GNs-MnO2 for the reduction of O2 shift positively ca. 80 mV and the current density is 1.3 times higher than that of pure MnO2, which may because of the highly porous architectures and high specific surface area of GNs-MnO2. Our work, not only successfully develops a low cost GNs-MnO2 composites with excellent electrocatalytic activity, it also reveals further insight into the ORR mechanism of GNs-MnO2 composites as ORR catalyst. These results could provide useful information to further clarify the ORR mechanism of metal oxide/carbon materials, and further develop other novel low-cost metal oxides/carbon hybrids with high activities for practical fuel cell application.

Key words: MnO2, graphene, electrocatalytic, oxygen reduction, in situ redox reaction