GNs-MnO2复合催化剂的制备及催化氧还原性能

doi:10.6023/A12121066

化学学报 ›› 2013, Vol. 71 ›› Issue (06): 957-961.DOI: 10.6023/A12121066 上一篇下一篇

研究论文

GNs-MnO₂复合催化剂的制备及催化氧还原性能

鲁振江^a, 徐茂文^b, 包淑娟^a,b, 柴卉^a

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,baoshj@swu.edu.cn; Tel.: 0086-023-68254943 E-mail:baoshj@swu.edu.cn
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 Zhenjiang^a, Xu Maowen^b, Bao Shujuan^a,b, Chai Hui^a

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).

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摘要/Abstract

石墨烯由单层碳原子组成, 具有大的比表面积和超高的导电性, 广泛应用于催化与储能领域. 本工作结合石墨烯独特的物理化学性质和结构特性, 采用原位氧化还原法, 以KMnO₄和石墨烯(GNs)为原料合成GNs-MnO₂氧还原催化剂, 通过X射线衍射(XRD)、拉曼光谱(Raman)、透射电镜(TEM)、热重(TG)、BET等分析测试技术研究了纳米GNs-MnO₂复合材料的微观结构特征. 结果表明, 合成的MnO₂纳米线直接生长在石墨烯的表面, 增加了MnO₂的比表面积, 提高了催化剂的活性位点. 电化学测试表明, 合成的GNs-MnO₂催化剂在碱性介质中电催化氧还原电位比纯MnO₂的氧还原电位正移80 mV, 电流提高了1.3倍, 在燃料电池氧还原电催化中有一定的应用前景.

关键词: MnO₂, 石墨烯, 电催化, 氧还原, 原位氧化还原

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 O₂shift 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

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鲁振江, 徐茂文, 包淑娟, 柴卉. GNs-MnO₂复合催化剂的制备及催化氧还原性能[J]. 化学学报, 2013, 71(06): 957-961.

Lu Zhenjiang, Xu Maowen, Bao Shujuan, Chai Hui. Preparation and Oxygen Reduction Performance of GNs-MnO₂ composite[J]. Acta Chimica Sinica, 2013, 71(06): 957-961.

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GNs-MnO₂复合催化剂的制备及催化氧还原性能

Preparation and Oxygen Reduction Performance of GNs-MnO₂ composite

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