Electrochemical Study of Binder-Free Electrodeposited NiCo2O4 Thin Film: Influence of Annealing Temperature

IF 3.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Electrocatalysis Pub Date : 2025-11-22 DOI:10.1007/s12678-025-00994-y

Roupya Gopal Ghosh, Shradha Roy, Partha Mitra, Ayan Mukherjee

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Abstract

In the field of energy storage, transition metal oxide thin films have become an exceptional candidate for electrode fabrication in recent times. In this study, we attempt to figure out the influence of annealing temperature on the structure and surface morphology, and also the impact on electrolyte ion transfer kinetics through porous NiCo₂O₄ (NCO) electrodes. NCO thin films have been efficaciously synthesized on conductive stainless steel (SS-304) substrate by using the potentiostatic electrodeposition technique followed by annealing at different temperatures (350℃, 400℃, and 450℃). The galvanostatic charge-discharge (GCD) plateaus reveal NCO-350 electrode exhibits a maximum specific capacitance of 896 F/g at 1 A/g. Electrochemical impedance spectroscopy (EIS) results suggest minimal diffusion resistance of the electrolyte ions confirming good conductive nature of the samples. After 3000 cyclic voltammetry (CV) cycles, the NCO-450 electrode possesses the highest capacitance retention value of 94.9% among all three electrodes. The overall electrochemical performance highlights the potential of NiCo₂O₄ thin films as efficient electrode materials for high-performance supercapacitors.

Graphical Abstract

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无粘结剂电沉积NiCo2O4薄膜的电化学研究：退火温度的影响

在能量存储领域，过渡金属氧化物薄膜近年来已成为电极制造的特殊候选者。在本研究中，我们试图找出退火温度对结构和表面形貌的影响，以及对电解质离子通过多孔NiCo2O4 （NCO）电极转移动力学的影响。采用恒电位电沉积技术在导电不锈钢（SS-304）衬底上制备了NCO薄膜，并在不同温度（350℃、400℃和450℃）下进行了退火。恒流充放电（GCD）平台显示NCO-350电极在1 a /g时的最大比电容为896 F/g。电化学阻抗谱（EIS）结果表明，电解质离子的扩散阻力最小，证实了样品的良好导电性质。经过3000次循环伏安（CV）循环后，NCO-450电极的电容保持值最高，为94.9%。整体电化学性能突出了NiCo2O4薄膜作为高性能超级电容器的高效电极材料的潜力。图形抽象

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来源期刊

Electrocatalysis CHEMISTRY, PHYSICAL-ELECTROCHEMISTRY

CiteScore

4.80

自引率

6.50%

发文量

审稿时长

>12 weeks

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