Wei Jinying, Qiu Daping, Li Min, Xie Zhenyu, Gao Ang, Liu Hongru, Yin Suhong, Yang Dongsheng, Yang Ru
State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology Beijing 100029 China
Central Research Institute of China Chemical Science and Technology Co., Ltd. Beijing 100029 China
RSC Adv. 2019 Apr 2;9(18):10237-10244. doi: 10.1039/c9ra00883g. eCollection 2019 Mar 28.
Ion substitution and micromorphology control are two efficient strategies to ameliorate the electrochemical performance of supercapacitors electrode materials. Here, Al doped α-Ni(OH) with peony-like morphology and porous structure has been successfully synthesized through a facile one-pot hydrothermal process. The Al doped α-Ni(OH) electrode shows an ultrahigh specific capacitance of 1750 F g at 1 A g, and an outstanding electrochemical stability of 72% after running 2000 cycles. In addition, the Al doped α-Ni(OH) electrode demonstrates an excellent rate capability (92% retention at 10 A g). Furthermore, by using this unique Al doped α-Ni(OH) as the positive electrode and a hierarchical porous carbon (HPC) as the negative electrode, the assembled asymmetric supercapacitor can demonstrate a high energy/power density (49.6 W h kg and 14 kW kg). This work proves that synthesizing an Al doped structure is an effective means to improve the electrochemical properties of α-Ni(OH). This scheme could be extended to other transition metal hydroxides to enhance their electrochemical performance.
离子取代和微观形态控制是改善超级电容器电极材料电化学性能的两种有效策略。在此，通过简便的一锅水热法成功合成了具有牡丹状形态和多孔结构的铝掺杂α-氢氧化镍。铝掺杂α-氢氧化镍电极在1 A g时表现出1750 F g的超高比电容，在运行2000次循环后具有72%的出色电化学稳定性。此外，铝掺杂α-氢氧化镍电极展示出优异的倍率性能（在10 A g时保持92%）。此外，通过使用这种独特的铝掺杂α-氢氧化镍作为正极和分级多孔碳（HPC）作为负极，组装的不对称超级电容器可展现出高能量/功率密度（49.6 W h kg和14 kW kg）。这项工作证明合成铝掺杂结构是改善α-氢氧化镍电化学性能的有效手段。该方案可扩展到其他过渡金属氢氧化物以增强其电化学性能。
