Vamsi Krishna B N, Khaja Hussain Sk, Yu Jae Su
Department of Electronics and Information Convergence Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si, Gyeonggi-do 17104, Republic of Korea.
Department of Electronics and Information Convergence Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si, Gyeonggi-do 17104, Republic of Korea; Department of Chemical Engineering, College of Engineering, Kyung Hee University, 1732, Deogyeong-daero, Gihung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea.
J Colloid Interface Sci. 2021 Jun 15;592:145-155. doi: 10.1016/j.jcis.2021.02.040. Epub 2021 Feb 16.
Development of asymmetric supercapacitors (ASCs) using hierarchical three-dimensional (3D) morphologies is becoming crucial in energy storage applications due to the greater power density rather than batteries. Herein, 3D flower-like Co(PO)·8HO (CPH) and nickel doped CPH (Ni-CPH) microarchitectures were synthesized by a silicone oil bath method at low temperatures without calcination. The synthesized microarchitectures-based electrodes (bare CPH and Ni-CPH) revealed battery-like properties during the electrochemical study. Importantly, the Ni-CPH electrode showed improved electrochemical performance compared to the bare CPH electrode material. The specific capacity values of the CPH and Ni-CPH electrode materials were calculated to be 74 and 108 mAh g at 0.5 A g, respectively. Furthermore, for the Ni-CPH electrode, 78% of capacity retention was obtained after 9000 cycles at 5 A g. Additionally, an ASC was developed while employing the optimized Ni-CPH electrode (positive-type) and activated carbon (negative-type) and it showed superior electrochemical results. The ASC device exhibited excellent capacity retention (94%) after 9000 cycles at 2 A g. Also, this device delivered a high energy density of 23.4 Wh kg and a power density of 2103 W kg. Finally, several portable electronic devices were successfully tested using the obtained good energy and power density results from the ASC device for energy storage applications.
由于具有比电池更高的功率密度，开发具有分层三维（3D）形态的不对称超级电容器（ASC）在储能应用中变得至关重要。在此，通过硅油浴法在低温下无需煅烧合成了3D花状Co(PO)·8HO（CPH）和镍掺杂的CPH（Ni-CPH）微结构。在电化学研究中，基于合成微结构的电极（裸CPH和Ni-CPH）表现出类似电池的性能。重要的是，与裸CPH电极材料相比，Ni-CPH电极表现出改善的电化学性能。CPH和Ni-CPH电极材料在0.5 A g下的比容量值分别计算为74和108 mAh g。此外，对于Ni-CPH电极，在5 A g下循环9000次后容量保持率为78%。此外，在使用优化的Ni-CPH电极（正极型）和活性炭（负极型）时开发了一种ASC，其显示出优异的电化学结果。该ASC器件在2 A g下循环9000次后表现出优异的容量保持率（94%）。而且，该器件具有23.4 Wh kg的高能量密度和2103 W kg的功率密度。最后，利用从ASC器件获得的良好能量和功率密度结果，成功测试了几种便携式电子设备用于储能应用。
