Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, 43 Keelung Road, Taipei 10607, Taiwan.
Int J Mol Sci. 2023 Mar 23;24(7):6045. doi: 10.3390/ijms24076045.
For effective supercapacitors, we developed a process involving chemical bath deposition, followed by electrochemical deposition and calcination, to produce WO/SnO nanocomposite electrodes. In aqueous solutions, the hexagonal WO microspheres were first chemically deposited on a carbon cloth, and then tin oxides were uniformly electrodeposited. The synthesized WO/SnO nanocomposite was characterized by XRD, XPS, SEM, and EDX techniques. Electrochemical properties of the WO/SnO nanocomposite were analyzed by cyclic voltammetry, galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy in an aqueous solution of NaSO with/without the redox-active electrolyte KFe(CN). KFe(CN) exhibited a synergetic effect on the electrochemical performance of the WO/SnO nanocomposite electrode, with a specific capacitance of 640 F/g at a scan rate of 5 mV/s, while that without KFe(CN) was 530 F/g. The WO/SnO nanocomposite catalyzed the redox reactions of [Fe(CN)]/[Fe(CN)] ions, and the [Fe(CN)]/[Fe(CN)] ions also promoted redox reactions of the WO/SnO nanocomposite. A symmetrical configuration of the nanocomposite electrodes provided good cycling stability (coulombic efficiency of 99.6% over 2000 cycles) and satisfied both energy density (60 Whkg) and power density (540 Wkg) requirements. Thus, the WO/SnO nanocomposite prepared by this simple process is a promising component for a hybrid pseudocapacitor system with a redox-flow battery mechanism.
为了制备高效超级电容器，我们开发了一种涉及化学浴沉积、电化学沉积和煅烧的工艺，以制备 WO/SnO 纳米复合材料电极。在水溶液中，首先通过化学沉积在碳布上沉积六方 WO 微球，然后均匀电沉积氧化锡。通过 XRD、XPS、SEM 和 EDX 技术对 WO/SnO 纳米复合材料进行了表征。通过循环伏安法、恒电流充放电测试和电化学阻抗谱在含/不含氧化还原活性电解质 KFe(CN)的 NaSO 水溶液中分析了 WO/SnO 纳米复合材料的电化学性能。KFe(CN)对 WO/SnO 纳米复合材料电极的电化学性能表现出协同效应，在扫描速率为 5 mV/s 时具有 640 F/g 的比电容，而不含 KFe(CN)时为 530 F/g。WO/SnO 纳米复合材料催化了 [Fe(CN)]/[Fe(CN)] 离子的氧化还原反应，[Fe(CN)]/[Fe(CN)] 离子也促进了 WO/SnO 纳米复合材料的氧化还原反应。纳米复合材料电极的对称构型提供了良好的循环稳定性（在 2000 次循环中库仑效率为 99.6%），满足了能量密度（60 Wh/kg）和功率密度（540 W/kg）的要求。因此，通过这种简单的工艺制备的 WO/SnO 纳米复合材料是具有氧化还原流电池机制的混合赝电容器系统的有前途的组件。
