Hierarchical ZnCo₂O₄@MnO₂ core–shell nanosheet arrays were successfully synthesized on Ni foam via a facile hydrothermal method followed by a calcination process. The fabricated ZnCo₂O₄@MnO₂ electrode exhibited a specific capacitance as high as 2170.00 F g⁻¹ (2.60 F cm⁻²) at a current density of 3 mA cm⁻² in a 1 M KOH solution. Furthermore, an all-solid-state asymmetric supercapacitor (ASC) device fabricated with the as-prepared ZnCo₂O₄@MnO₂ as the positive electrode and activated carbon (AC) as the negative electrode in the PVA/KOH gel electrolyte achieved a high energy density of 29.41 W h kg⁻¹ at a power density of 628.42 W kg⁻¹ and retained 95.3% of its initial capacitance after 3000 cycles at a high current density of 10 mA cm⁻². With the smart design and remarkable electrochemical properties, the hierarchical ZnCo₂O₄@MnO₂ core–shell nanosheet arrays on Ni foam demonstrated great potential for further applications in the energy storage field.

中文翻译：

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用于高性能全固态非对称超级电容器的Ni泡沫材料上 的分层ZnCo ₂ O ₄ @MnO ₂核-壳纳米片阵列的合成†

通过方便的水热方法，然后进行煅烧工艺，成功地在泡沫镍上合成了分层的ZnCo ₂ O ₄ @MnO ₂核-壳纳米片阵列。所制得的ZnCo ₂ O ₄ @MnO ₂电极在1 M KOH溶液中的电流密度为3 mA cm ^-2时，显示出比电容高达2170.00 F g ^-1（2.60 F cm ^-2）。此外，用所制备的ZnCo ₂ O ₄ @MnO ₂制造的全固态不对称超级电容器（ASC）器件作为PVA / KOH凝胶电解质中的正电极和活性炭（AC）作为负电极，在628.42 W kg ^-1的功率密度下实现了29.41 W h kg ^-1的高能量密度，并保留了其初始能量的95.3％在10 mA cm ^-2的高电流密度下经过3000次循环后的电容。凭借智能设计和出色的电化学性能，镍泡沫上的分层ZnCo ₂ O ₄ @MnO ₂核-壳纳米片阵列展示了在储能领域进一步应用的巨大潜力。