A facile and new anion exchange process is presented, which involves the conversion of NiCo‐CO₃ layered double hydroxide (LDH) nanosheet arrays in an alkaline solution. The anion exchange between CO₃²⁻ and OH⁻ results in the construction of a reservoir for OH⁻ anions, and the decoration of thin nanoflakes on the surface of nanosheets effectively enlarges the surface area of NiCo LDH nanoarrays. The capacitance of the as‐soaked NiCo LDH nanoarrays electrode increases from 1.78 F cm⁻² (684 F g⁻¹) to 6.22 F cm⁻² (2391 F g⁻¹) at 2 mA cm⁻² after soaking for 12 h. Moreover, the soaked NiCo‐OH LDH electrode exhibits an enhanced rate capacity, high coulombic efficiency, and good cycling stability compared with the Ni–Co‐S nanosheet electrode synthesized through a hydrothermal sulfuration process. The as‐assembled all‐solid‐state NiCo LDH//active carbon asymmetric supercapacitor shows a maximum energy density of 83.4 W h kg⁻¹ at a power density of 1066 W kg⁻¹.

中文翻译：

---

Ni-Co层状双氢氧化物（LDH）纳米阵列用于高电容超级电容器电极的阴离子交换：碱性阴离子交换和硫化的比较

提出了一种简便而又新颖的阴离子交换方法，该方法涉及在碱性溶液中转化NiCo-CO ₃层状双氢氧化物（LDH）纳米片阵列。CO之间的阴离子交换₃ ^2-和OH ^-在为OH的贮存器的结构的结果^-的阴离子，及薄纳米薄片的纳米片的表面上的装饰有效地扩大镍钴LDH纳米阵列的表面积。浸泡后的NiCo LDH纳米阵列电极的电容在2 mA cm ^-2时从1.78 F cm ^-2（684 F g ^-1）增加到6.22 F cm ^-2（2391 F g ^-1）。浸泡12小时后。此外，与通过水热硫化工艺合成的Ni-Co-S纳米片电极相比，浸泡的NiCo-OH LDH电极具有更高的倍率容量，高库仑效率和良好的循环稳定性。将如此组装的全固态镍钴LDH //活性炭不对称超级电容器示出了83.4 W时公斤的最大能量密度^-1处的1066千克w ^的功率密度^-1。