Yadav A A, Hunge Y M, Ko Seongjun, Kang Seok-Won
Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, Korea.
Division of Biotechnology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Korea.
Materials (Basel). 2022 Sep 3;15(17):6133. doi: 10.3390/ma15176133.
Among energy storage devices, supercapacitors have received considerable attention in recent years owing to their high-power density and extended cycle life. Researchers are currently making efforts to improve energy density using different asymmetric cell configurations, which may provide a wider potential window. Many studies have been conducted on positive electrodes for asymmetric supercapacitor devices; however, studies on negative electrodes have been limited. In this study, iron oxides with different morphologies were synthesized at various deposition temperatures using a simple chemical bath deposition method. A nanosphere-like morphology was obtained for α-FeO. The obtained specific capacitance () of α-FeO was 2021 F/g at a current density of 4 A/g. The negative electrode showed an excellent capacitance retention of 96% over 5000 CV cycles. The fabricated asymmetric solid-state supercapacitor device based on α-FeO-NF//CoO-NF exhibited a of 155 F/g and an energy density of 21 Wh/kg at 4 A/g.
在储能装置中，超级电容器近年来因其高功率密度和长循环寿命而受到广泛关注。研究人员目前正在努力通过使用不同的非对称电池配置来提高能量密度，这可能会提供更宽的潜在窗口。已经对非对称超级电容器装置的正极进行了许多研究；然而，对负极的研究却很有限。在本研究中，使用简单的化学浴沉积方法在不同的沉积温度下合成了具有不同形态的氧化铁。α-FeO呈现出纳米球状形态。在4 A/g的电流密度下，α-FeO的比电容（）为2021 F/g。负极在5000次循环伏安循环中表现出96%的优异电容保持率。基于α-FeO-NF//CoO-NF制备的非对称固态超级电容器装置在4 A/g时的比电容为155 F/g，能量密度为21 Wh/kg。
