3D hierarchical cobalt vanadate nanosheet arrays on Ni foam coupled with redox additive for enhanced supercapacitor performance

Abstract

ASC device based on Co3V2O8 nanowalls, activated carbon and K3[Fe(CN)6]/KOH redox additive electrolyte shows an ultrahigh energy density of 55.5 W h Kg−1 at a power density of 800 W Kg−1.

Growth Dynamics‐Dependent Chemical Approach to Accomplish Nanostructured Cobalt Vanadium Oxide Thin Film Electrodes with Controlled Surface Area for High‐Performance Solid‐State Hybrid Supercapacitor Devices

“…[ 37 ] This work uses only SS as a conductive substrate, which avoids the redox reaction in the alkaline electrolyte; hence the obtained SE and SP originated from the CVO1:1 and rGO materials. Moreover, the position of the HASD device in the Ragone plot is higher than SHSD and reported hybrid devices in terms of SP, without scarifying much SE, [ 11,16,49–56 ] suggesting the suitability of CVO1:1 thin film electrode for next‐generation hybrid energy storage devices.…”

“…Nguyen et al constructed a Co 3 V 2 O 8 //AC device and achieved SE of 55.5 Wh kg −1 at a higher SP of 800 W kg −1 . [ 50 ] Moreover, Sun et al [ 16 ] developed Co 2 V 2 O 7 ·3.3H 2 O//rGO, and Liu et al [ 51 ] prepared CoV 2 O 6 ·2H 2 O//AC devices reported SE of 19 Wh kg −1 at 375.8 W kg −1 SP and SE of 19 Wh kg −1 at 400 W kg −1 SP, respectively. Lv et al [ 52 ] fabricated Co 3 O 4 /CoV x O y //AC asymmetric device and reported SE of 26.1 Wh kg −1 at 400 W kg −1 .…”

“…Moreover, the SHSD and ASHD devices manufactured in the present work demonstrated higher performance than the reported only similar device by Wang et al [ 11 ] in terms of SE and SP. However, the reported energy densities for Co 3 V 2 O 8 //AC, [ 49 ] Co 3 V 2 O 8 //AC, [ 50 ] and Co 3 V 2 O 8 ‐Ni 3 V 2 O 8 ‐PCNFs//PCNFs [ 56 ] HASDs are slightly higher than the present work due to the use of Ni‐foam (NF) as a conductive substrate since Ni foam can add its self‐capacitance in the alkaline device. [ 37 ] This work uses only SS as a conductive substrate, which avoids the redox reaction in the alkaline electrolyte; hence the obtained SE and SP originated from the CVO1:1 and rGO materials.…”