超级电容器
电容
固态
功率密度
化学工程
氨
材料科学
比表面积
纳米技术
电极
化学
物理化学
有机化学
功率(物理)
催化作用
物理
工程类
量子力学
作者
Guofeng Zhang,Qin Pan,Ramzi Nasser,Shikuo Li,Ping Chen,Ji‐Ming Song
标识
DOI:10.1016/j.cej.2020.124029
摘要
Design and synthesis of flexible electrode materials with high specific capacitance and rate capability is critical to supercapacitors. In this work, Co(CO3)0.5(OH)/Ni2(CO3)(OH)2 nanobelts with controllable size were successfully synthesized for the first time in the presence of appropriate amount ammonia. And we found that by adjusting the amount of ammonia, the size, morphology and phase composition proportion of Co(CO3)0.5(OH)/Ni2(CO3)(OH)2 could also be controlled. Impressively, benefiting from its special structure and large specific surface area (191.3 m2 g−1), the obtained nanobelts exhibited superior supercapacitor performance with the specific capacitance of 987 F g−1 at 1 A g−1 and 720 F g−1 at 30 A g−1, and an excellent rate performance. The all-solid-state asymmetric supercapacitor (ASC) assembled by using Co(CO3)0.5(OH)/Ni2(CO3)(OH)2 nanobelts as positive materials showed a high specific capacitance of 110.3 F g−1 at 1 A g−1 and 83.3% retention after 5000 cycles, which could provide an energy density of 22.7 Wh kg−1 at a power density of 24019 W kg−1, demonstrating a powerful energy storage capability at high power density for ASC. Moreover, the assembled ASC exhibited an outstanding flexibility, and its supercapacitor properties hardly changed after undergoing the different bending angles. In addition, the two ASCs in series could illuminate a yellow LED for 15 min. These results indicated that the Co(CO3)0.5(OH)/Ni2(CO3)(OH)2 nanobelts had great potential application prospects as a high power density all-solid-state flexible asymmetric supercapacitor electrode materials.
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