Zhang Ling, Li Ruizhi, Li Weiqun, Li Rongcong, Li Chenliang, Zhou Yingke
The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology Wuhan 430081 P. R. China
Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies Chongqing 400715 P. R. China.
RSC Adv. 2020 Jun 15;10(38):22775-22782. doi: 10.1039/d0ra03771k. eCollection 2020 Jun 10.
Cycling performance is very important to device application. Herein, a facile and controllable approach is proposed to synthesize high stability CuCoO nanoneedle array on a conductive substrate. The electrode presents excellent performances in a large specific capacitance up to 2.62 F cm (1747 F g) at 1 mV s and remarkable electrochemical stability, retaining 164% even over 70 000 cycles. In addition, the asymmetric supercapacitor assembled with the optimized CuCoO nanoneedle array (cathode) and active carbon (anode), which exhibits superior specific capacity (146 F g), energy density (57 W h kg), and cycling stability (retention of 83.9% after 10 000 cycles). These outstanding performances are mainly ascribed to the ordered binder-free nanoneedle array architecture and holds great potential for the new-generation energy storage devices.
循环性能对器件应用非常重要。在此，我们提出了一种简便且可控的方法，用于在导电基底上合成具有高稳定性的CuCoO纳米针阵列。该电极在1 mV s时具有高达2.62 F cm（1747 F g）的大比电容以及出色的电化学稳定性，即使在超过70000次循环后仍保持164%。此外，由优化的CuCoO纳米针阵列（阴极）和活性炭（阳极）组装而成的不对称超级电容器，具有优异的比容量（146 F g）、能量密度（57 W h kg）和循环稳定性（10000次循环后保持83.9%）。这些优异性能主要归因于有序的无粘结剂纳米针阵列结构，在新一代储能器件方面具有巨大潜力。
