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Construction of nanowall-supported-nanorod nico ldh array electrode with high mass-loading on carbon cloth for high-performance asymmetric supercapacitors
Electrochimica Acta ( IF 5.5 ) Pub Date : 2020-09-10 , DOI: 10.1016/j.electacta.2020.137081
Tianyi Yang , Jing Ye , Shihuan Chen , Shuqing Liao , Huizhen Chen , Luhuan Yang , Xuetang Xu , Fan Wang

Carbon cloth is regarded as a promising substrate for supercapacitors due to its good electrical conductivity, light weight and flexibility. However, its relatively hydrophobic property prevents the large-scale growth of active substances, restricting the potential practical applications. In this paper, by using NiCo LDH nanowall array as a hydrophilic substrate, a high mass-loading nanowall-supported-nanorod NiCo LDH arrays are formed via an alternate solvo/hydrothermal synthesis and subsequently alkali conversion process. The strong substrate adhesion of NiCo LDH nanoarrays ensures efficient electron transfer of the electrode. Moreover, the as-achieved open holey framework, integrated by free-standing nanorods and porous nanowalls, provides a hierarchical nanostructure for realizing the enhanced capacitive performance. Consequently, nanowall-supported-nanorod NiCo LDH electrode achieves a high capacitance of 7.73 F cm−2 at a current density of 5 mA cm−2 with excellent rate performance. When assembled into an all-solid-state hybrid supercapacitor, it delivers a maximum working voltage of 1.8 V, and an energy density of 0.46 mWh cm−2 (6.37 mWh cm−3) at a power density of 4.5 mW cm−2 (62.5 mW cm−2). Therefore, this work provides a proof-of-concept design for the high-performance supercapacitor electrode with carbon cloth substrate.



中文翻译:

碳布上高质量负载纳米壁支撑纳米级镍钴镍钴合金阵列电极的构建,用于高性能不对称超级电容器

碳布由于其良好的导电性,重量轻和柔韧性而被认为是超级电容器的有前途的基材。然而,其相对疏水的性质阻止了活性物质的大规模生长,限制了潜在的实际应用。在本文中,通过使用NiCo LDH纳米壁阵列作为亲水性基底,通过交替的溶剂/水热合成和随后的碱转化过程形成了高负载纳米壁负载的纳米钴NiCo LDH阵列。NiCo LDH纳米阵列对基材的牢固附着力可确保电极的有效电子转移。而且,由独立的纳米棒和多孔纳米壁集成的已完成的开孔框架为实现增强的电容性能提供了分层的纳米结构。所以,-2在5 mA cm -2的电流密度下具有出色的倍率性能。当组装成的全固态混合超级电容器,它提供了1.8 V的最大工作电压,和0.46厘米mWh的能量密度-2(6.37 mWh的厘米-3)以4.5毫瓦厘米的功率密度-2( 62.5 mW cm -2)。因此,这项工作为带有碳布基底的高性能超级电容器电极提供了概念验证设计。

更新日期:2020-09-23
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