碳量子点修饰的三维多孔锌钴氧化物微球阵列及其高性能超级电容器应用
尖晶石锌钴氧化物（ZCO）导电性差、循环稳定性不足。本文通过原位水热法在泡沫镍上生长三维多孔ZCO微球阵列，并锚定含氧官能团碳量子点（CQDs），构筑ZCO/CQDs 复合电极。SEM证实三维开放孔道，XPS表明CQDs增强电子传导并保留Co2+/Co3+ 赝电容活性。电化学测试显示：0.5 A g-1下比电容249.3 F g-1，表面电容贡献76.8%（10 mV s-1），电荷转移电阻0.4 Ω，8000次循环后保持率91%，库仑效率近100%。组装器件可点亮LED灯。研究表明，CQDs修饰与三维多孔结构协同优化电荷传输与结构稳定性，为高性能过渡金属氧化物基超级电容器提供有效策略。
[1]Dong Z, Zhou Q. Carbon–based nanostructured materials incorporating carbon dots for supercapacitors: a review[J]. Nanoscale, 2025, 17(18): 10530–10552.
[2]Zhang B, Wang B, Ushakova E V, et al. Assignment of core and surface states in multicolor ‐emissive carbon dots[J]. Small, 2023, 19(31): 2204158.
[3]Nguyen K, Huš M, Baragau I A, et al. Engineering nitrogen–doped carbon quantum dots: Tailoring optical and chemical properties through selection of nitrogen precursors[J]. Small, 2024, 20(31): 2310587.
[4]Yu J, Lee D, Kwon J, et al. Quantum dot–derived carbon nanopocket–confined Co3O4 within mesoporous carbon nanofiber for Cu–free anode of flexible Li–ion batteries[J]. Applied Surface Science, 2023, 637: 157905.
[5]Ramaraghavulu R, Venkateswarlu S, Rao V R, et al. In situ engineered 0D interconnected network–like CNS decorated on Co–rich ZnCo2O4 2D nanosheets for high–performance supercapacitors[J]. Journal of the Taiwan Institute of Chemical Engineers, 2020, 113: 155–162.
[6]Lu W, Hartman R, Qu L et al. ZnCo2O4/C–dots nanocomposite for high– performance supercapacitor electrodes[J]. Journal of Energy Storage, 2024, 86: 111586.
[7]Chen J, Wang X, Zhang J, et al. In situ growth of ZnCo2O4 nanosheets on nickel foam for supercapacitors with enhanced electrochemical performance[J]. RSC Advances, 2019, 9(24): 13648–13655.
[8]Zhang Y, Lu L, Zhang T, et al. Hierarchical ZnCo2O4 nanowire arrays grown on nickel foam for high–performance supercapacitors[J]. Journal of Materials Chemistry A, 2018, 6(12): 4989–4998.
[9]Yang W, Zhao J, Zhang Y, et al. MOF–derived hierarchical hollow ZnCo2O4/C architectures for high–performance supercapacitors[J]. Journal of Materials Chemistry A, 2019, 7(10): 5635–5643.
[10]Xu X, Chen H, Zhang X, et al. Construction of ZnCo2O4/C core–shell nanostructures for high–performance supercapacitors[J]. Electrochimica Acta, 2020, 353: 136571.