Synthesis and characterization of free-standing activated carbon/reduced graphene oxide film electrodes for flexible supercapacitors
Synthesis and characterization of free-standing activated carbon/reduced graphene oxide film electrodes for flexible supercapacitors
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用于柔性超级电容器的自支撑活性炭/还原氧化石墨烯薄膜电极的合成与表征
DOI：
10.1039/c7ra07459j
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发表时间：
2017-09
期刊：
影响因子：
3.9
通讯作者：
Yao Chunli
中科院分区：
文献类型：
--
作者：
Xu Lanshu;Li Yue;Jia Mengying;Zhao Qiang;Jin Xiaojuan;Yao Chunli
通过简单的真空过滤工艺制备了各种比例的独立式、无粘合剂、柔性活性炭/还原氧化石墨烯（AC/rGO）复合薄膜。事实证明，二维 rGO 片是 AC 的理想粘合支撑。确定了最佳比率 (AC : rGO = 2 : 1)，薄膜电极在 0.2 mA cm−2 电流下表现出 486 mF cm−2 的高面积比电容，质量为 2.35 mg cm−2（比电容为 207 F g−1）。组装的超级电容器具有柔性、轻质、廉价和环保的优点，在100 μW cm−2的功率密度下可实现16.2 μW h cm−2的优异能量密度，并且在10 000次充放电循环后电容保持率为85%。而且，在1000次弯曲循环后仍保留90%的电容，并且在不同弯曲角度下几乎没有性能变化。这些结果充分证明了AC/rGO薄膜电极在可穿戴和便携式电子产品中的巨大应用潜力。
Free-standing, binder-free and flexible activated carbon/reduced graphene oxide (AC/rGO) composite films with various ratios were fabricated via a facile vacuum-filtration process. It was proved that two-dimensional rGO sheets were an ideal adhesive support for AC. The optimal ratio (AC : rGO = 2 : 1) was determined and the film electrodes displayed a high area specific capacitance of 486 mF cm−2 with a mass of 2.35 mg cm−2 (specific capacitance of 207 F g−1) at 0.2 mA cm−2. The assembled supercapacitor had the advantages of being flexible, lightweight, cheap and environmentally friendly, and can achieve a superior energy density of 16.2 μW h cm−2 at a power density of 100 μW cm−2 and 85% capacitance retention after 10 000 charging/discharging cycles. Moreover, 90% of the capacitance was retained after 1000 bending cycles and there was almost no performance change under different bending angles. These results well demonstrated a great potential for application of AC/rGO film electrodes in wearable and portable electronics.
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