Qiu Yanling, Liu Zhiqiang, Sun Yuesheng, Wang Chunxiao, Barrow Colin J, Razal Joselito M, Yang Wenrong, Cui Liang, Liu Jingquan
College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao 266071, China.
School of Life and Environmental Sciences, Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
ACS Appl Mater Interfaces. 2022 Aug 3;14(30):34770-34780. doi: 10.1021/acsami.2c08546. Epub 2022 Jul 22.
Reasonable design of materials with complex nanostructures and diverse chemical compositions is of great significance in the field of energy storage. CuKS (CKS) is considered a potential electrode material for supercapacitors due to its superior electrical conductivity. Transition metal hydroxides are widely used as electrode materials for supercapacitors due to their high theoretical specific capacitance (); however, single metal species with limited active sites restrict their further applications for energy storage. Herein, through a hydrothermal reaction, CKS nanorods were prepared, and then binary metal hydroxide NiCo(OH) nanosheets were generated directly on CKS nanorods through a one-step hydrothermal reaction to form a nano-core-shell structure (NCSS). By regulating the mole ratio of nickel nitrate to cobalt nitrate, the resulting NiCo(OH) nanosheets with the best electrochemical activity were prepared and supported on CKS nanorods to form a CKS@NCOH NCSS. The as-prepared CKS@NCOH NCSS has a larger specific surface area, which can provide more active sites, while the abundant metal species composition can generate abundant redox reactions to boost the pseudocapacitance. The prepared CKS@NCOH/NF electrode exhibits outstanding specific capacitance and cycle life. The assembled CKS@NCOH/NF//AC all-solid-state asymmetric supercapacitor achieves a high energy density of 88.7 Wh kg at a power density of 849.9 W kg with superior cycle life. Therefore, the use of polymetallic hydroxides to construct NCSS electrodes has great research significance and broad application prospects.
合理设计具有复杂纳米结构和多样化学成分的材料在储能领域具有重要意义。由于其优异的导电性，CuKS（CKS）被认为是超级电容器的一种潜在电极材料。过渡金属氢氧化物因其高理论比电容而被广泛用作超级电容器的电极材料；然而，具有有限活性位点的单一金属物种限制了它们在储能方面的进一步应用。在此，通过水热反应制备了CKS纳米棒，然后通过一步水热反应在CKS纳米棒上直接生成二元金属氢氧化物NiCo(OH)纳米片，形成纳米核壳结构（NCSS）。通过调节硝酸镍与硝酸钴的摩尔比，制备出具有最佳电化学活性的NiCo(OH)纳米片，并负载在CKS纳米棒上，形成CKS@NCOH NCSS。所制备的CKS@NCOH NCSS具有更大的比表面积，可提供更多活性位点，同时丰富的金属物种组成可产生大量氧化还原反应以提高赝电容。制备的CKS@NCOH/NF电极表现出优异的比电容和循环寿命。组装的CKS@NCOH/NF//AC全固态不对称超级电容器在功率密度为849.9 W kg时实现了88.7 Wh kg的高能量密度，且具有优异的循环寿命。因此，使用多金属氢氧化物构建NCSS电极具有重大的研究意义和广阔的应用前景。
