Low-Temperature Aluminum Reduction of Graphene Oxide, Electrical Properties, Surface Wettability, and Energy Storage Applications
Low-Temperature Aluminum Reduction of Graphene Oxide, Electrical Properties, Surface Wettability, and Energy Storage Applications
复制标题
氧化石墨烯的低温铝还原、电性能、表面润湿性和储能应用
DOI：
10.1021/nn303228r
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发表时间：
2012-10-01
期刊：
影响因子：
17.1
通讯作者：
Lin, Jianhua
中科院分区：
文献类型：
--
作者：
Wan, Dongyun;Yang, Chongyin;Lin, Jianhua
低温铝（Al）还原首次引入在100-200℃的双区炉中还原氧化石墨烯（GO）。熔化的Al金属表现出优异的脱氧能力，可以制备出结晶良好的还原氧化石墨烯（RGO）纸，其O/C比低至0.058 (Al-RGO)，而热还原的氧化石墨烯（T-RGO）纸的O/C比为0.201。Al-RGO纸具有出色的机械柔韧性和极高的导电性，薄片电阻R-s（约1.75 ω /sq），而T-RGO纸的电阻为20.12 ω /sq。更有趣的是，观察到非常好的疏水性（90.5度），明显优于已报道的化学或热还原纸。这些增强的性能归因于RGO论文中的低氧含量。在铝还原过程中，来自H2O的高活性H原子与熔化的Al反应，保证了有效的除氧。该方法也适用于还原氧化石墨烯泡沫，氧化石墨烯泡沫在G0/SA（硬脂酸）复合材料中用作高导热储层，以容纳相变材料以进行热能储存。将al还原RGO/SnS2复合材料进一步应用于具有更高比容量的锂离子电池负极材料。综上所述，低温还原Al是制备高导电性RGO纸及相关复合材料的有效方法，可用于柔性能量转换和存储器件。
Low-temperature aluminum (Al) reduction is first introduced to reduce graphene oxide (GO) at 100-200 degrees C in a two-zone furnace. The melted Al metal exhibits an excellent deoxygen ability to produce well-crystallized reduced graphene oxide (RGO) papers with a low O/C ratio of 0.058 (Al-RGO), compared with 0.201 in the thermally reduced one (T-RGO). The Al-RGO papers possess outstanding mechanical flexibility and extremely high electrical conductivities sheet resistance R-s similar to 1.75 Omega/sq), compared with 20.12 Omega/sq of T-RGO. More interestingly, very nice hydrophobic nature (90.5 degrees) was observed, significantly superior to the reported chemically or thermally reduced papers. These enhanced properties are attributed to the low oxygen content in the RGO papers. During the aluminum reduction, highly active H atoms from H2O reacted with melted Al promise an efficient oxygen removal. This method was also applicable to reduce graphene oxide foams, which were used in the G0/SA (stearic acid) composite as a highly thermally conductive reservoir to hold the phase change material for thermal energy storage. The Al-reduced RGO/SnS2 composites were further used in an anode material of lithium ion batteries possessing a higher specific capacity. Overall, low-temperature Al reduction is an effective method to prepare highly conductive RGO papers and related composites for flexible energy conversion and storage device applications.