Coaxial CoMoO₄ nanowire arrays with chemically integrated conductive coating for high-performance flexible all-solid-state asymmetric supercapacitors

Abstract

Flexible all-solid-state supercapacitors have offered promising applications as novel energy storage devices based on their merits, such as small size, low cost, light weight and high wearability for high-performance portable electronics. However, one major challenge to make flexible all-solid-state supercapacitors depends on the improvement of electrode materials with higher electrical conductivity properties and longer cycling stability. In this article, we put forward a simple strategy to in situ synthesize 1D CoMoO4 nanowires (NWs), using highly conductive CC and an electrically conductive PPy wrapping layer on CoMoO4 NW arrays for high performance electrode materials. The results show that the CoMoO4/PPy hybrid NW electrode exhibits a high areal specific capacitance of ca. 1.34 F cm(-2) at a current density of 2 mA cm(-2), which is remarkably better than the corresponding values for a pure CoMoO4 NW electrode of 0.7 F cm(-2). An excellent cycling performance of nanocomposites of up to 95.2% (ca. 1.12 F cm(-2)) is achieved after 2000 cycles compared to pristine CoMoO4 NWs. In addition, we fabricate flexible all-solid-state ASC which can be cycled reversibly in the voltage range of 0-1.7 V, and exhibits a maximum energy density of 104.7 W h kg(-1) (3.522 mW h cm(-3)), demonstrating great potential for practical applications in flexible energy storage electronics.

Porous NiCo2O4 nanowires supported on carbon cloth for flexible asymmetric supercapacitor with high energy density

“…synthesis a 2D ultrathin nanoflakes of MnO 2 film on the flexible stainless foil, the pseudocapacitor shows excellent energy density of 23 Wh kg −1 and power density of 1.9 kW kg −1 [16] . Zheng [6] , NiMoO 4 [19] , CoMoO 4 [20] , ZnCo 2 O 4 [21] and ZnWO 4 [22] have been widely researched. Among them, NiCo 2 O 4 is regarded as one of the most attractive electrode materials owing to its higher electrical conductivity and superior electrochemical properties [23,24] .…”

One‐Dimensional Nanostructured Pseudocapacitive Materials: Design, Synthesis and Applications in Supercapacitors

“…Other 1D nano‐array PCMs such as WON NWs, Nb NWs, CoSe NWs, bimetallic compounds (ZnCo 2 O 4 , CoMoO 4 , MnCo 2 S 4 ), and so on, have been investigated for their promising applications in supercapacitors. All of these works demonstrate that 1D nano‐array PCMs effectively improve the ion diffusion and charge transfer of the electrode itself, thus resulting in high‐rate capabilities.…”

High‐Performance Flexible Solid‐State Asymmetric Supercapacitors based on Ordered Mesoporous Cobalt Oxide

“…To avoid any possible leakage of electrolyte, costly encapsulation technologies are needed to fabricate aqueous ASC devices . Recently, solid‐state ASCs have attracted growing interest and attention in the field of SCs . They offer many advantages such as low weight, facile production processes, small sizes, high reliability, and wide operating temperature ranges .…”