Department of Chemistry and Energy Harvest Storage Research Center (EHSRC), University of Ulsan, Muger-dong, Nam-gu, Ulsan 680-749, Republic of Korea.
Dalton Trans. 2018 May 15;47(19):6722-6728. doi: 10.1039/c8dt00591e.
A binder-free, MgCo2O4 nanosheet-like architecture was prepared on Ni-foam using a hydrothermal method. MgCo2O4/Ni-foam was characterized by X-ray diffraction, field emission scanning electron microscopy (FESEM), and transmission electron microscopy techniques. The FESEM image revealed a nanosheet array-like architecture. The MgCo2O4 nanosheets grown on Ni-foam exhibited the maximum specific capacity of 947 C g-1 at a specific current of 2 A g-1. Approximately 96% of the specific capacity was retained from the maximum specific capacity after 5000 continuous charge-discharge cycles. This hybrid device exhibited a maximum specific capacity of 52 C g-1 at a specific current of 0.5 A g-1, and also exhibited a maximum specific energy of 12.99 W h kg-1 at a specific power of 448.7 W kg-1. These results confirmed that the binder-free MgCo2O4 nanosheets grown on Ni-foam are a suitable positive electrode material for hybrid supercapacitors.
采用水热法在泡沫镍上制备了无粘结剂的 MgCo2O4 纳米片层结构。通过 X 射线衍射、场发射扫描电子显微镜（FESEM）和透射电子显微镜技术对 MgCo2O4/Ni-泡沫进行了表征。FESEM 图像显示出纳米片层阵列状结构。在电流为 2 A g-1 时，生长在 Ni-泡沫上的 MgCo2O4 纳米片具有最大比容量 947 C g-1。经过 5000 次连续充放电循环后，比容量从最大比容量保留了约 96%。该混合器件在电流为 0.5 A g-1 时具有最大比容量 52 C g-1，在功率为 448.7 W kg-1 时具有最大比能量 12.99 W h kg-1。这些结果证实，生长在 Ni-泡沫上的无粘结剂 MgCo2O4 纳米片是混合超级电容器的合适正极材料。
