Flexible All-Solid-State Asymmetric Supercapacitors Based on PPy-Decorated SrFeO_3−δ Perovskites on Carbon Cloth

Abstract

The defective structure and high oxygen vacancy concentration of SrFeO 3−δ perovskite enable fast ion-electron transport, but its low conductivity still hinders the high electrochemical performance. Herein, to enhance the conductivity of SrFeO 3−δ -based electrodes, polypyrrole-modified SrFeO 3−δ perovskite on carbon cloth (PPy@SFO@CC) has been successfully fabricated by electrodeposition of polypyrrole (PPy) on the surface of SFO@CC. The optimal PPy700@SFO@CC electrode exhibits a specific capacitance of 421 F g −1 at 1 A g −1 . It was found that the outside PPy layer not only accelerates the electron transport and ion diffusion but also creates more oxygen vacancies in SrFeO 3−δ , enhancing the charge storage performance significantly. Moreover, the NiCo 2 O 4 @CC//PPy700@SFO@CC device maintains a specific capacitance of 63.6% after 3000 cycles, which is ascribed to the weak adhesion forces between the active materials and carbon cloth. Finally, the all-solid-state flexible supercapacitor NiCo 2 O 4 @CC//PPy700@SFO@CC is constructed with PVA-KOH as the solid electrolyte, delivering an energy density of 16.9 W h kg −1 at a power density of 984 W kg −1 . The flexible supercapacitor retains 69% of its specific capacitance after 1000 bending and folding times, demonstrating a certain degree of foldability. The present study opens new avenues for perovskite oxide-based flexible all-solid-state supercapacitors.

The Use of NiFe2O4 and CoFe2O4 Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

“…stated that the specific capacitance value in 1 M NaOH solution for Fe‐substituted SrCoO 3 perovskite reached 526 F/g at a current density of 1 A/g [79] . In a study on polypyrrole‐modified SrFeO 3 ‐δ perovskite, the specific capacitance value was found to be 421 F/g [80] …”

Optimized Charge Dynamics of Sr2Fe2O5/rGO Composite Electrodes: Redefining Supercapacitor Efficiency

“…Cullity. 19 Further these indexed planes were compared with the ICSD database provided by HighScore plus software. These XRD peaks matched well with ICSD card # 00-028-1227, that confirmed the presence of cubic perovskite structure of Sr 2 Fe 2 O 5 , 23 The sample at x = 0.00 exhibits the lattice constant values as a = b = c = 3.84 Å depicting the unit cell volume as 56.62 Å 3 , whereas for x = 0.33 and x = 0.66 substitution values, many intensity peaks seemed to be identical like those which appeared at x = 0.00.…”

“…This study was focused on elucidating the correlation between oxygendeficient perovskite oxide and rGONR in terms of their impact on charge storage and cell performance. Yin et al 19 developed z E-mail: satiq.cssp@pu.edu.pk ECS Journal of Solid State Science and Technology, 2024 13 021001 SrFeO 3−δ perovskite to improve the conductivity of SrFeO 3−δ -based electrodes. They further developed polypyrrole-modified SrFeO 3−δ perovskite on carbon cloth, called PPy@SFO@CC.…”

Constructing Flower-Shaped NiCo2S4@CoAl-LDH Heterojunction Nanosheets Exhibits Extraordinary Electrochemical Behavior for a Light-Assisted Asymmetric Supercapacitor

“…Beyond that, the mass ratio of the three materials used should be controlled at 8:1:1. The equation below can be used to determine the optimal active substance mass ratio for NCS@CA and AC electrodes, along with the densities of power and energy for ASC: − m − m + = C + × normalΔ V + C − × normalΔ V − E normals normalc = C normalG normalC normalD × normalΔ V 2 7.2 .25em normalW normalh / normalk normalg P normals normalc = 3600 E normalΔ t .25em normalW / normalk normalg where m (g), C (F g –1 ), Δ V (V), and Δ t denote the loading masses on NF, specific capacitance, potential window, and duration of discharge, individually.…”