Stretchable Supercapacitor with Adjustable Volumetric Capacitance Based on 3D Interdigital Electrodes

Abstract

4601wileyonlinelibrary.com fabricate, [ 14 ] has shown good performance as electrodes in energy harvesting/storage devices, such as solar cells, [15][16][17] secondary batteries, [ 18 ] and especially supercapacitors. [ 8,[10][11][12] Combined with the solution preparation and the fl exibility, rGO has already been expected as a competitive alternative for the next-generation fl exible supercapacitors.Despite being one kind of the ideal electrode materials, the present rGO-based materials are restricted by unsatisfactory volumetric capacitance in fl exible devices. On the one hand, the specifi c capacitance of rGO is not high (generally 50-200 F g −1 ), which depends on the electrical double layer at the interface between electrode and electrolyte. [ 19 ] On the other hand, the large inert space in practical devices (large volume ratio of encapsulation layers in the device) also accounts for the low volumetric energy density. [ 9 ] These two points have plagued the integration of rGO-based fl exible supercapacitors into roll-up displays, wearable device or other fl exible microdevices. Therefore, researchers are striving to fi nd new feasible method for preparing rGO-based electrodes with satisfactory electrochemical performance, including high volumetric capacitance and long cycle life. Previously, we fabricated fl exible microsupercapacitor with well-ordered conducting polymer nanostructures on rGO interdigital electrodes to enhance the specifi c capacitance through synergistic effect. [ 20 ] This high-performance microsupercapacitor provides a promising power source whose reliability and performance might meet the energy demands of the next-generation miniaturized electronic devices, especially fl exible devices. More recently, some feasible methods have also been studied by other research groups. For example, 3D interpenetrating graphene electrodes have been fabricated by electrochemical reduction of GO for ultrahigh rate supercapacitors; [ 21 ] Gao co-workers proposed a coaxial wet-spinning assembly approach to continuously spin polyelectrolyte-wrapped graphene/CNT core-sheath yarns and the yarn-based supercapacitors showed a capacitance of 177 mF cm −2 in solid electrolyte (SE); [ 22 ] carbon microfi bers made of aligned single-walled carbon nanotubes (SWCNTs) and nitrogen-doped rGO sheets are produced and show a specifi c volumetric capacity of 300 F cm −3 in polyvinyl alcohol (PVA)/ H 3 PO 4 electrolyte; [ 23 ] to further improve the capacitance, metal oxides, and conducting polymer are introduced to composite with carbon materials. [ 24,25 ] These modifi cations show valuable characteristics in enhancing the performance, especially the specifi c capacitance; Stretchable Supercapacitor with Adjustable Volumetric Capacitance Based on 3D Interdigital ElectrodesFengwang Li , Jitao Chen , * Xusheng Wang , Mianqi Xue , * and G. F. Chen Reduced graphene oxide (rGO)-based materials have shown good performance as electrodes in fl exible energy storage devices owing to their physical properties, high specifi c ...

Carbon Cloth‐based Hybrid Materials as Flexible Electrochemical Supercapacitors

“…Apart from being conductive, PIn has an excellent storage ability, thermal stability and electrochemical reversibility . On the other hand, conducting polymers and metal oxides due to their pseudo‐capacitive nature usually exhibit large specific capacitance and energy density, making them ideal positive electrode materials …”

“…[46] On the other hand, conducting polymers and metal oxides due to their pseudocapacitive nature usually exhibit large specific capacitance and energy density, making them ideal positive electrode materials. [47,48] The carbon-based materials due to their complementary operating voltage windows with various positive electrodes are used as negative electrodes. Hence, the as-prepared V 2 O 5 / PIn@ACC was used as a positive electrode along with rGO@ACC as a negative electrode to construct an asymmetric supercapacitor.…”

Nanomaterials for Stretchable Energy Storage and Conversion Devices

“…In consideration of ESCDs' practical application, two industrial methods: machine coating and pressure spray printing were introduced by Li et al to fabricate a rGO-based stretchable supercapacitor with 3D interdigital electrodes (Fig. 4.8a) [50]. In this supercapacitor, each interdigital electrode contains a layer of solid electrolyte film by means of machine coating and a sandwich layer of rGO thin film, which consists of two rGO thin layers as active materials with a layer of Ag nanowires as current collector (rGO/Ag-NWs/rGO), through pressure spray printing (Fig.…”

Stretchable Supercapacitors as Emergent Energy Storage Units for Health Monitoring Bioelectronics

“…[132] The prestraining strategy was further extended to biaxial directions, providing stretchability along all in-plane directions. [136] However, if the planar interdigitated electrode is made from rigid materials, cracks may easily appear upon stretching. It exhibited a unique combination of high stretchability of 600% under biaxial strain, high capacitance of 77 F g −1 , and good reliability over 1000 stretch/ release cycles.…”