Direct 3D printing of a graphene oxide hydrogel for fabrication of a high areal specific capacitance microsupercapacitor
Direct 3D printing of a graphene oxide hydrogel for fabrication of a high areal specific capacitance microsupercapacitor
复制标题
直接 3D 打印氧化石墨烯水凝胶，用于制造高面积比电容微型超级电容器
DOI：
10.1039/c9ra04882k
复制
发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Wang Xiaogong
中科院分区：
文献类型：
--
作者：
Yun Xiawei;Lu Bingchuan;Xiong Zhiyuan;Jia Bo;Tang Bo;Mao Henan;Zhang Ting;Wang Xiaogong
在这项工作中，我们证明了氧化石墨烯（GO）水凝胶具有独特的流变特性，如高储能模量，剪切变稀性质和快速粘度恢复，非常适合作为三维（3D）打印的墨水。结果表明，GO油墨同时具有凝胶和粘性液体的特性，其中凝胶-液体转变取决于剪切速率和剪切应变幅。在挤出和打印过程中，油墨显示出显著的剪切稀化和剪切停止后的快速粘度恢复，这对于通过直接油墨书写（DIW）的3D打印是期望的。确定了合适的扫描速度和挤出速度，以构建精确的3D结构。还原后的分级多孔结构RGO电极稳定、精度更高、单位面积负载更多有效材料。具有叉指结构的3D打印微型超级电容器（MSC）在0.5 mA cm−2的电流密度下表现出101 mF cm−2的高面积比电容，在10 mV s−1的扫描速率下表现出111 mF cm−2的高面积比电容，与大多数报道的碳基材料的MSC相比，这是上级的。
In this work, we demonstrate that a graphene oxide (GO) hydrogel with unique rheological properties, such as high storage modulus, shear-thinning nature and fast viscosity recovery, is highly suitable as an ink for three dimensional (3D) printing. The results show that the GO ink has the characteristics of both gel and viscous liquid, where the gel–liquid transition depends on the shear rate and shear strain amplitude. In the extrusion and printing process, the ink shows significant shear thinning and rapid viscosity recovery after cessation of shearing, which are desirable for 3D printing through direct ink writing (DIW). A suitable scanning speed and extrusion speed were determined to construct a precise 3D structure. After the reduction, the RGO electrode with hierarchical porous structures is stable, of higher precision, and loaded with more of the effective materials per unit area. The 3D printed micro-supercapacitors (MSCs) with interdigitated architecture exhibit a high areal specific capacitance of 101 mF cm−2 at a current density of 0.5 mA cm−2 and 111 mF cm−2 at a scan rate of 10 mV s−1, which are superior compared with most of the reported MSCs of carbon-based materials.