Layer-by-Layer Assembly of Reduced Graphene Oxide and MXene Nanosheets for Wire-Shaped Flexible Supercapacitors
Layer-by-Layer Assembly of Reduced Graphene Oxide and MXene Nanosheets for Wire-Shaped Flexible Supercapacitors
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用于线状柔性超级电容器的还原氧化石墨烯和 MXene 纳米片的逐层组装
DOI：
10.1021/acsami.0c19619
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发表时间：
2021
影响因子：
9.5
通讯作者：
Naraghi, Mohammad
中科院分区：
文献类型：
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作者：
Yun, Junyeong;Echols, Ian;Flouda, Paraskevi;Chen, Yijun;Wang, Shaoyang;Zhao, Xiaofei;Holta, Dustin;Radovic, Miladin;Green, Micah J.;Naraghi, Mohammad
随着对可穿戴电子设备需求的增加，人们对小、轻、可变形的储能设备的兴趣也随之增加。在这些器件中，线形超级电容器（WSCs）由于其几何形状与编织纤维相似而被认为是可穿戴技术的关键部件。制造WSC器件的一种潜在方法是逐层（LbL）组装技术，这是一种“自下而上”的电极制造方法。WSCs要求在线状基材上涂上功能材料的保形涂层和粘合剂，这是真空过滤或喷涂等其他加工技术难以获得的。然而，LbL组装技术产生的保形和坚固的涂层可以沉积在各种基材和形状上，包括电线。在这项研究中，我们报道了用带正电荷的还原氧化石墨烯与带负电荷的Ti3C2TxMXene纳米片交替的LbL组装而成的WSCs，这些带正电荷的氧化石墨烯被聚二烯二甲基氯化铵功能化，并在活性炭纱上共形沉积。在这种结构中，与未涂覆的活性炭纱相比，添加了LbL膜的活性炭纱的电容、能量密度和功率密度分别提高了240、227和109%，产生了较高的比容量和体积容量（237 F - 1、2193 F cm-3）。此外，WSC具有良好的力学稳定性，在200次弯曲循环后仍能保持90%的初始容量。该研究表明，碳纱上的LbL涂层作为光纤电子器件的线性储能器件具有广阔的应用前景。
As the demand for wearable electronic devices increases, interest in small, light, and deformable energy storage devices follows suit. Among these devices, wire-shaped supercapacitors (WSCs) are considered key components of wearable technology due to their geometric similarity to woven fiber. One potential method for creating WSC devices is the layer-by-layer (LbL) assembly technique, which is a “bottom-up” method for electrode fabrication. WSCs require conformal and adhesive coatings of the functional material to the wire-shaped substrate, which is difficult to obtain with other processing techniques such as vacuum filtration or spray-coating. However, the LbL assembly technique produces conformal and robust coatings that can be deposited onto a variety of substrates and shapes, including wires. In this study, we report WSCs made using the LbL assembly of alternating layers of positively charged reduced graphene oxide functionalized with poly(diallyldimethylammonium chloride) and negatively charged Ti3C2TxMXene nanosheets conformally deposited on activated carbon yarns. In this construct, the added LbL film enhances capacitance, energy density, and power density by 240, 227, and 109%, respectively, relative to the uncoated activated carbon yarn, yielding high specific and volumetric capacitances (237 F g–1, 2193 F cm–3). In addition, the WSC possesses good mechanical stability, retaining 90% of its initial capacity after 200 bending cycles. This study demonstrates that LbL coatings on carbon yarns are promising as linear energy storage devices for fibrous electronics.