Reduced graphene oxide with tunable C/O ratio and its activity towards vanadium redox pairs for an all vanadium redox flow battery
Reduced graphene oxide with tunable C/O ratio and its activity towards vanadium redox pairs for an all vanadium redox flow battery
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DOI：
10.1016/j.carbon.2012.12.069
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发表时间：
2013-04-01
期刊：
影响因子：
10.9
通讯作者：
Yan, Chuanwei
中科院分区：
文献类型：
--
作者：
Li, Wenyue;Liu, Jianguo;Yan, Chuanwei
在磷酸盐缓冲溶液（PBS）中的不同还原电位下获得电化学还原氧化石墨烯（ERGO）。采用不同的表征方法来分析氧化石墨烯（GO）的结构和表面化学状况的变化。结果表明，利用这种环境友好的方法，GO可以在一定程度上可控还原，并且其对VO2+/VO2+和V3+/V2+氧化还原电对的电化学活性也可以调节。详细讨论了ERGO的催化机理，ERGO表面除C-O官能团之外的C=O官能团更有可能为这些氧化还原对提供反应位点，从而比以前的相关研究对催化过程有更全面的了解。这种可控改性方法和ERGO作为电极反应催化剂具有增强的电池性能，预计在全钒氧化还原液流电池中具有广阔的应用前景。 (C) 2013 Elsevier Ltd. 保留所有权利。
Electrochemically reduced graphene oxides (ERGO) are obtained under various reducing potentials in the phosphate buffer solution (PBS). Different characterization methods are used to analyse the changes of structure and surface chemical condition for graphene oxide (GO). The results show that GO could be reduced controllably to certain degree and its electrochemical activity towards VO2+/VO2+ and V3+/V2+ redox couples is also tunable using this environmentally friendly method. The catalytic mechanism of the ERGO is discussed in detail, the C=O functional groups other than the C-O functional groups on the surface of ERGO more likely provide reactive sites for those redox couples, leading to a more comprehensive understanding about the catalytic process than previous relevant researches. This controllable modification method and the ERGO as electrode reaction catalyst with enhanced battery performance are supposed to have promising applications in the all vanadium redox flow battery. (C) 2013 Elsevier Ltd. All rights reserved.