Layered double hydroxides (LDH) are regarded as promising electrode materials for supercapacitors due to their abundance, multiple oxidation states, and high theoretical capacitance. However, the limited active sites and dull reaction kinetics restrict their commercialization. In this work, the 3D hierarchical N-doping ZnCo-LDH array on nickel foam (NF) as an electrode material (N-ZnCo-LDH) was designed and directly fabricated via a hydrothermal method using 2-Methylimidazole as a nitrogen source. Consequently, the N-doping confined the growth of the N-ZnCo-LDH to form ultrathin nanosheets, which exposed more redox reaction active sites and facilitated the charge transfer, resulting in the enhancement in charge storage capacity. As a result, the optimal N_(0.5)-ZnCo-LDH achieved a high specific charge of 942.6 C g⁻¹ at 1.0 A g⁻¹, excellent charge-discharge rate property (68.9% retention) and long durability (84.1% after 5 000 cycles). Also, the hybrid supercapacitor (N-ZnCo-LDH//AC) was fabricated employing N_(0.5)-ZnCo-LDH as anode and activated carbon (AC) as cathode, which achieved an energy density of 29.2 Wh kg⁻¹ at a power density of 750.0 W kg⁻¹, and excellent cycling stability (84.0% retention after 10,000 cycles), which highlighted the potential of the N_(0.5)-ZnCo-LDH electrode material towards practical application of supercapacitors.

层状双氢氧化物（LDH）因其含量丰富、多种氧化态和高理论电容而被认为是有前途的超级电容器电极材料。然而，有限的活性位点和迟钝的反应动力学限制了它们的商业化。在这项工作中，设计了泡沫镍（NF）上的3D分层N掺杂ZnCo-LDH阵列作为电极材料（N-ZnCo-LDH），并使用2-甲基咪唑作为氮源通过水热法直接制备。因此，N掺杂限制了N-ZnCo-LDH的生长，形成超薄纳米片，暴露出更多的氧化还原反应活性位点，促进电荷转移，从而提高电荷存储容量。结果，最佳的N _(0.5) -ZnCo-LDH在1.0 A g ^{-1下实现了942.6 C g -1}的高比电荷、优异的充放电倍率特性（68.9%的保持率）和长耐久性（84.1%的放电后寿命）。 5000 次循环）。此外，采用N _(0.5) -ZnCo-LDH作为阳极、活性炭（AC）作为阴极制造了混合超级电容器（N-ZnCo-LDH//AC），其在100℃下^{实现了29.2 Wh kg -1}的能量密度。 750.0 W kg ^{−1的功率密度和优异的循环稳定性（10,000次循环后保持率为84.0%），凸显了N} _(0.5) -ZnCo-LDH电极材料在超级电容器实际应用中的潜力