High performance supercapacitors are designed based on hierarchical Ni(OH)₂ nanosponges anchored on sulfur-enriched polyaniline (PANI) nanotubes and waste tyre-derived onion-like carbons (OLC) as counter electrode materials. The rational strategy of grafting mesoporous thin sheets of Ni(OH)₂ on PANI produces unique composite nanoarchitectures that shows superior potential in supercapacitors validated by higher electrochemical stability. The designed asymmetric supercapacitor configuration with OLC as anode exhibits excellent specific capacitance of 622 F g⁻¹ at higher current density of 2 A g⁻¹ with an exceptional capacity retention greater than 97% achieved upon 10,000 continuous charge-discharge cycles. The asymmetric device delivers the remarkable energy and power density of 70 Wh kg⁻¹ and 136 kW kg⁻¹, respectively, whereas the symmetric device delivers the maximum energy density of 23 Wh kg⁻¹ and power density of 292 kW kg⁻¹. Further, it is demonstrated that Ni(OH)₂@PANI composite-based all solid-state flexible asymmetric supercapacitor construction with OLC exhibits high specific capacitance value of 166 F g⁻¹ at a higher current density of 5 A g⁻¹. The prolonged cycle stability may be attributed to the synergistic effect of 3D-nanosponge-like Ni(OH)₂ on PANI nanotubes surface, stabilizing the volume changes upon cycling. The OLC derived from the pyrolysis of waste-tyres offers high energy density and better rate capability.

基于锚固在富硫聚苯胺（PANI）纳米管上的分层Ni（OH）₂纳米海绵和废轮胎衍生的洋葱状碳（OLC）作为对电极材料，设计了高性能超级电容器。在PANI上接枝Ni（OH）₂介孔薄膜的合理策略产生了独特的复合纳米结构，该结构在超级电容器中显示出了更高的潜力，并通过更高的电化学稳定性得到了验证。设计的以OLC为阳极的非对称超级电容器配置在2 A g ^-1的更高电流密度下具有622 F g ^-1的出色比电容在10,000次连续充放电循环后，其出色的容量保持率超过97％。非对称设备分别提供了70 Wh kg ^-1和136 kW kg ^-1的显着能量和功率密度，而对称设备则提供了23 Wh kg ^-1的最大能量密度和292 kW kg ^-1的最大功率密度。此外，已经证明具有OLC的基于Ni（OH）₂ @PANI复合物的全固态柔性非对称超级电容器构造在更高的5 A g ^-1的电流密度下表现出166 F g ^-1的高比电容值。。延长的循环稳定性可能归因于3D-纳米海绵状Ni（OH）₂对PANI纳米管表面的协同作用，稳定了循环时的体积变化。废轮胎热解制得的OLC具有高能量密度和更好的分选能力。