Abstract
The purpose of this work is to explore the application prospects of WS2 as an active material in flexible electrodes. Since WS2 has similar disadvantages as other two-dimensional layered materials, such as easily stacking, it is essential to develop a three-dimensional structure for its assembly in terms of electrochemical performance. In addition, the low conductivity of WS2 limits its application as flexible electrode material. In order to solve these problems, carbon nanotubes (CNTs) are introduced to improve the conductivity of hybrid WS2 materials and to construct a skeleton structure during WS2 assembly. Compared with pure CNTs and WS2, the WS2@CNT thin-film hybrid with a unique skeleton structure has a high specific area capacitance that reaches a maximum of 752.53 mF/cm2 at a scan rate 20 mV/s. Meanwhile, this hybrid electrode material shows good stability, with only 1.28% loss of its capacitance over 10,000 cycles. In order to prove its feasibility for practical application, a quasi-solid-state flexible supercapacitor is assembled, and its electrochemical characteristics (the specific area capacitance is 574.65 mF/cm2) and bendability (under bending to 135° 10, 000 times, 23.12% loss at a scan rate of 100 mV/s) are further investigated and prove its potential in this field.
Highlights
In the few past decades, with the rapid development of flexible electronic devices (Wang et al, 2015; Choi et al, 2016) and wearable electronic devices (An et al, 2017), flexible and deformable energy storage devices, which are the real bottleneck hindering flexible electronics from becoming ubiquitous in practical products (Zhang et al, 2018c), have gradually become a research hotspot
In contrast to the hybrid film, which has the unique skeleton structure obtained by freeze-drying, we found that, on naturally dried films obtained at room temperature, the carbon nanotubes (CNTs) completely coat the surface of the WS2 nanosheets; there is no connecting structure between the layers (Figure S2)
The influence of acid-base on the electrochemical performance of the hybrid film electrode was not significant, and the Cyclic voltammetry (CV) curves showed a larger area in sulfuric acid, so 1M H2SO4 was chosen as the electrolyte (Figure S3A)
Summary
In the few past decades, with the rapid development of flexible electronic devices (Wang et al, 2015; Choi et al, 2016) and wearable electronic devices (An et al, 2017), flexible and deformable energy storage devices, which are the real bottleneck hindering flexible electronics from becoming ubiquitous in practical products (Zhang et al, 2018c), have gradually become a research hotspot. Carbon-based materials, which act as active materials to contribute EDLC as electrode materials, have large surface areas, controllable pore size, and high chemical stability, but their. Skeleton Structural Electrodes for Supercapacitors single micropore structure affects their capacitive performance (Borenstein et al, 2017; Zhang et al, 2018a,d). Graphene, one of the most common electrode materials for SCs, has the advantages of large specific surface area and high electrical conductivity (Jadhav et al, 2019). Graphene tends to aggregate due to its soft skeleton, and the actual specific surface area is much lower than the theoretical value, resulting in relatively low capacitance performance (Han et al, 2014; Iakunkov et al, 2019)
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