Jo Seungju, Kitchamsetti Narasimharao, Cho Hyunwoo, Kim Daewon
Department of Electronics and Information Convergence Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, Republic of Korea.
Institute for Wearable Convergence Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin 17104, Republic of Korea.
Polymers (Basel). 2023 Jan 15;15(2):454. doi: 10.3390/polym15020454.
Recently, there is a need to explore the utilization of various heterostructures using the designed nanocomposites and tuning the surfaces of electrodes for improving the electrochemical performance of supercapacitors (SC). In this work, a novel approach is successfully employed through a facile two-step synthetic route with the assistance of a microwave for only 1 min. Depending on the glass transition of a polystyrene (PS) substrate and electrochemical deposition (ECD) of electroactive Ni-Co layered double hydroxides (LDHs), a hierarchically designed flake-like morphology can be readily prepared to enhance the surface-active sites, which allows a rhombohedral Ni-Co LDHs electrode to obtain superior electrochemical properties. Further, the interactions between electrode and electrolyte during the diffusion of ions are highly simplified using multiple enhanced electroactive sites and shorter pathways for electron transfer. The unique surface architecture of the PS substrate and the synergistic effect of the bimetallic components in Ni-Co LDHs enable this substrate to obtain desired electrochemical activity in charge storage systems. The optimized MWC CoNi electrode exhibited an areal capacity of 100 µAh/cm at a current density of 1 mA/cm and a remarkable capacity retention of 91.2% over 5000 continuous charging and discharging cycles due to its remarkable synergistic effect of abundant faradaic redox reaction kinetics. The HSC device is assembled with the combination of optimized MWC CoNi and activated carbon as a positive and negative electrode, respectively. Further, the electrochemical test results demonstrated that MWC CoNi //AC HSC device showed a high areal capacitance of 531.25 mF/cm at a current density of 5 mA/cm. In addition, the fabricated an aqueous HSC device showed a power density of 16 mW/cm at an energy density of 0.058 mWh/cm, along with the remarkable capacity retention of 82.8% even after 10,000 continuous charging and discharging cycles. Moreover, the assembled hybrid supercapacitor (HSC) device is integrated with a triboelectric nanogenerator (TENG) for the development of energy conversion and storage systems. Not only an extensive survey of materials but also an innovative solution for recent progress can confirm the wide range of potential SC applications. Remarkably, this study is a new way of constructing self-powered energy storage systems in the field of sustainable wearable electronics and future smart sensing systems.
最近，有必要探索使用设计的纳米复合材料来利用各种异质结构，并调整电极表面以提高超级电容器（SC）的电化学性能。在这项工作中，通过一种简便的两步合成路线并借助仅1分钟的微波成功采用了一种新颖的方法。根据聚苯乙烯（PS）基底的玻璃化转变和电活性镍钴层状双氢氧化物（LDH）的电化学沉积（ECD），可以很容易地制备出具有分层设计的片状形态，以增强表面活性位点，这使得菱面体镍钴LDH电极能够获得优异的电化学性能。此外，利用多个增强的电活性位点和更短的电子转移路径，高度简化了离子扩散过程中电极与电解质之间的相互作用。PS基底独特的表面结构以及镍钴LDH中双金属成分的协同效应，使该基底在电荷存储系统中获得所需的电化学活性。优化后的MWC CoNi电极在电流密度为1 mA/cm²时表现出100 μAh/cm²的面积容量，并且由于其丰富的法拉第氧化还原反应动力学的显著协同效应，在5000次连续充放电循环中具有91.2%的显著容量保持率。HSC器件由优化后的MWC CoNi和活性炭分别作为正负极组装而成。此外，电化学测试结果表明，MWC CoNi//AC HSC器件在电流密度为5 mA/cm²时表现出531.25 mF/cm²的高面积电容。此外，所制备的水系HSC器件在能量密度为0.058 mWh/cm²时功率密度为16 mW/cm²，即使在10000次连续充放电循环后仍具有82.8%的显著容量保持率。此外，组装的混合超级电容器（HSC）器件与摩擦纳米发电机（TENG）集成在一起，用于开发能量转换和存储系统。不仅对材料进行了广泛的研究，而且对近期进展提出了创新的解决方案，这可以证实超级电容器的广泛潜在应用。值得注意的是，这项研究是在可持续可穿戴电子和未来智能传感系统领域构建自供电储能系统的一种新方法。
