CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China.
ACS Nano. 2012 Oct 23;6(10):9068-78. doi: 10.1021/nn303228r. Epub 2012 Sep 21.
Low-temperature aluminum (Al) reduction is first introduced to reduce graphene oxide (GO) at 100-200 °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) ~ 1.75 Ω/sq), compared with 20.12 Ω/sq of T-RGO. More interestingly, very nice hydrophobic nature (90.5°) 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 H(2)O reacted with melted Al promise an efficient oxygen removal. This method was also applicable to reduce graphene oxide foams, which were used in the GO/SA (stearic acid) composite as a highly thermally conductive reservoir to hold the phase change material for thermal energy storage. The Al-reduced RGO/SnS(2) 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.
低温铝（Al）还原首先被引入到双区炉中，在 100-200°C 下还原氧化石墨烯（GO）。与热还原的（T-RGO）相比，熔融 Al 金属具有出色的脱氧能力，可生产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）。与 T-RGO 的 20.12 Ω/sq 相比，Al-RGO 纸具有出色的机械柔韧性和极高的电导率（面电阻 R(s)~1.75 Ω/sq）。更有趣的是，观察到非常好的疏水性（90.5°），明显优于报道的化学或热还原纸。这些增强的性能归因于 RGO 纸中的低氧含量。在铝还原过程中，来自 H₂O 的高活性 H 原子与熔融 Al 反应，保证了有效的氧去除。该方法也适用于还原氧化石墨烯泡沫，它被用于 GO/SA（硬脂酸）复合材料中作为高热导率的储层，以容纳相变材料进行热能存储。进一步将 Al 还原的 RGO/SnS(2)复合材料用作锂离子电池的阳极材料，具有更高的比容量。总的来说，低温 Al 还原是一种有效的方法，可以制备高导电性 RGO 纸及其相关复合材料，用于柔性能量转换和存储器件应用。
