The performance of supercapacitor electrode materials was greatly affected by the specific surface area. The urchin-like NiCo₂O₄ was transformed into porous NiCo₂O₄ (AA-NiCo₂O4) using the acid–alkali treatment method. The specific surface area of AA-NiCo₂O₄ was 165.0660 m²/g, which was about three times larger than that of NiCo₂O₄. The specific capacitance of the AA-NiCo₂O₄ was enhanced significantly (1700 F/g at 1 A/g), and AA-NiCo₂O₄ possesses good rate capacitance (1277 F/g at 10 A/g). This is mainly attributed to the larger specific surface area, fast and convenient electron–ion transport and redox reaction. Therefore, AA-NiCo₂O₄ is a promising high-performance supercapacitor electrode material.

中文翻译：

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酸基改性 NiCo2O4 作为高性能超级电容器电极材料

超级电容器电极材料的性能受比表面积的影响很大。海胆状 NiCo ₂ O ₄转变为多孔 NiCo ₂ O ₄ (AA-NiCo ₂ O4)采用酸碱处理法。_{AA-NiCo 2} O ₄的比表面积为165.0660 m ^{2 /g，约为NiCo} ₂ O ₄的3倍。AA-NiCo ₂ O ₄的比电容显着提高（1700 F/g at 1 A/g），AA-NiCo ₂ O ₄具有良好的倍率电容（1277 F/g at 10 A/g）。这主要归功于较大的比表面积、快速方便的电子-离子传输和氧化还原反应。因此，AA-NiCo ₂ O ₄是一种很有前途的高性能超级电容器电极材料。