Abstract The controllable introduction of heteroatoms into electrode materials via doping is one of the most effective strategies to realize improved electrochemical reaction kinetics and then electrochemical energy storage properties. Herein, vanadium doped nickel-cobalt layered double hydroxide nanosheet arrays (NCV-LDH NSAs) were prepared via a one-step hydrothermal method and applied as a new class of efficient supercapacitor electrode. Benefiting from the exceptional porosities and abundant electroactive sites, the hierarchical NCV-LDH NSAs based electrodes reveal enhanced pseudocapacitive behaviors. Among all, the NCV-LDH-10 displays the highest performance with a specific capacitance of 2960 F g−1 at a current density of 1 A g−1 and retains 762 F g−1 at a high current density of 50 A g−1. The asymmetric supercapacitor was assembled based on NCV-LDH-10 hybrid and activated carbon (AC). It achieves a high energy density of 31.95 Wh kg−1 at a power density of 356 W kg−1. It is worth noting that the integrated electrode exhibits remarkable long-term cycling stability at a current density of 10 A g−1 and preserves about 81.8% of its original capacitance after 10,000 continuous cycles. The outcomes achieved can provide a potential chance for practical application in sustainable energy storage systems.

中文翻译：

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用于高性能超级电容器的钒掺杂分级多孔镍钴层状双氢氧化物纳米片阵列

摘要 通过掺杂在电极材料中可控地引入杂原子是实现改善电化学反应动力学和电化学储能性能的最有效策略之一。在此，通过一步水热法制备了钒掺杂的镍钴层状双氢氧化物纳米片阵列（NCV-LDH NSA），并将其用作一类新型的高效超级电容器电极。受益于特殊的孔隙率和丰富的电活性位点，基于分层 NCV-LDH NSA 的电极显示出增强的赝电容行为。其中，NCV-LDH-10 表现出最高的性能，在 1 A g-1 的电流密度下具有 2960 F g-1 的比电容，并在 50 A g-1 的高电流密度下保持 762 F g-1 1. 非对称超级电容器是基于 NCV-LDH-10 混合和活性炭 (AC) 组装而成的。它在 356 W kg-1 的功率密度下实现了 31.95 Wh kg-1 的高能量密度。值得注意的是，集成电极在 10 A g-1 的电流密度下表现出显着的长期循环稳定性，并在连续 10,000 次循环后保持其原始电容的约 81.8%。取得的成果可以为可持续储能系统的实际应用提供潜在机会。000 连续循环。取得的成果可以为可持续储能系统的实际应用提供潜在机会。000 连续循环。取得的成果可以为可持续储能系统的实际应用提供潜在机会。