Temperature‐Dependent Electrochemical Performance of Ta‐Substituted SrCoO₃ Perovskite for Supercapacitors

Abstract

Developing new electrode materials with good temperature‐dependent electrochemical performance has become a great issue for the deployment of hybrid supercapacitors with wide temperature tolerance. In this work, a series of Ta‐substituted SrCo1‐xTaxO3‐δ (x = 0.05, 0.10, 0.15, 0.20) perovskites have been studied as positive electrodes for hybrid supercapacitors in terms of their structures, elemental valence states and electrochemical performances. Incorporating Ta into SrCoO3‐δ perovskite not only stabilizes the crystallite structure but also notably improves electrochemical activities. The SrCo0.95Ta0.05O3‐δ@CC delivers the highest specific capacity (Qsp) of 227.91 C g‐1 at 1 A g‐1, which is attributed to the highest oxygen vacancy content and the fastest oxygen diffusion kinetics. The hybrid supercapacitor SrCo0.95Ta0.05O3‐δ@CC//AC@CC exhibits a high energy density of 22.82 Wh kg‐1@775.09 W kg‐1 and a stable long‐term cycle life (5000 cycles) with 90.7% capacity retention. As temperature increases from 25 to 85 ℃, the capacitance properties are improved at elevated temperatures for both electrode and device due to the increased electrolyte conductivity. The outstanding electrochemical results present that SrCo1‐xTaxO3‐δ perovskite holds good prospects for hybrid supercapacitors with wide temperature tolerance.

Green supercapacitors: review and perspectives on sustainable template-free synthesis of metal and metal oxide nanoparticles

“…Besides the size and shape when the temperature increases, the capacitance of the synthesized material also increases. 36,37…”

“…42 In contrast to fungi and bacteria, which require a longer incubation period, the phytochemicals found in plant leaf extracts have amazing ability to reduce metal ions in a considerably shorter amount of time. 36 As a result, plant leaf extracts are regarded as a superior and safe source for the creation of metal and metal oxide nanoparticles. Moreover, the plant extract plays a dual role of stabilizing agent and reducing agent.…”

“…Their excellent crystallinity, costeffectiveness, charge storage capacity, electrical and ionic conductivity, and electrochemical activity are also well-known qualities. 36,37,94 It has been concluded that the most effective ion adsorption, and consequently the largest double-layer capacitance occur when the ion size is close to the pore size because pore sizes that are less or larger than the ion size result in a decreased capacitance. The typical range of specic capacitance obtained from EDLCs is 100-250 F g −1 , while the energy density of supercapacitor devices based on carbon materials is between 3 and 10 W h kg −1 .…”

Cr-Substituted SrCoO3-δ Perovskite with Abundant Oxygen Vacancies for High-Energy and Durable Low-Temperature Antifreezing Flexible Supercapacitor

“…Consequently, investigating the impact of Cr substitution on the structure and electrochemical behavior of the SrCoO 3 perovskite becomes an intriguing research focus, with the goal of gaining deeper insights into the underlying influence mechanisms of the p6 configuration cation. Additionally, we have previously investigated the high-temperature electrochemical properties of SrCo 1– x Ta x O 3‑δ and SrCo 1– x Fe x O 3‑δ perovskites, which exhibited broad high-temperature resistance. However, there remains a research gap concerning the low-temperature resistance of perovskite materials and the development of antifreezing perovskite-based devices.…”

Upcycling waste plastic into 2D-carbon nanomaterials for high-performance supercapacitors by incorporating NiCo2O4: a sustainable approach to renewable energy

“…21–23 By using substituted perovskite material as the positive electrode material in hybrid supercapacitors, one can further increase the energy density of a supercapacitor. 24,25…”