Flexible Supercapacitor Electrodes Based on Carbon Cloth-Supported LaMnO3/MnO Nano-Arrays by One-Step Electrodeposition
Flexible Supercapacitor Electrodes Based on Carbon Cloth-Supported LaMnO3/MnO Nano-Arrays by One-Step Electrodeposition
复制标题
一步电沉积基于碳布支撑 LaMnO3/MnO 纳米阵列的柔性超级电容器电极
DOI：
10.3390/nano9121676
复制
发表时间：
2019-12-01
期刊：
影响因子：
5.3
通讯作者：
Lu, Qiuling
中科院分区：
文献类型：
--
作者：
Ma, Pianpian;Lei, Na;Lu, Qiuling
镧基钙钛矿型氧化物是一种极具潜力的新型超级电容器电极材料。本研究采用简单的一步电沉积法制备了碳布负载的LaMnO 3/MnO（LMO/MnO）纳米阵列作为柔性超级电容器电极。研究了LMO/MnO的结构、存款形貌和电化学性能。在0.5 M Na 2SO 4电解质水溶液中，电流密度为0.5 A·g-1时，碳布负载LMO/MnO电极的比电容为260 F·g-1。LMO和MnO的协同效应以及均匀的纳米阵列形貌有助于其良好的电化学性能。此外，制造了具有2 V宽电压窗口的对称超级电容器，在745 W·kg-1的功率密度下显示出28.15Wh·kg-1的高能量密度。由于LMO/MnO的元素浸出效应和部分剥落，前500次循环后比电容下降至65%，但在5000次循环之前保持稳定。这是第一次将La基钙钛矿用于柔性超级电容器应用，预计将进一步优化。
La-based perovskite-type oxide is a new type of supercapacitor electrode material with great potential. In the present study, LaMnO3/MnO (LMO/MnO) nano-arrays supported by carbon cloth are prepared via a simple one-step electrodeposition as flexible supercapacitor electrodes. The structure, deposit morphology of LMO/MnO, and the corresponding electrochemical properties have been investigated in detail. Carbon cloth-supported LMO/MnO electrode exhibits a specific capacitance of 260 F·g−1 at a current density of 0.5 A·g−1 in 0.5 M Na2SO4 aqueous electrolyte solution. The cooperative effects of LMO and MnO, as well as the uniform nano-array morphology contribute to the good electrochemical performance. In addition, a symmetric supercapacitor with a wide voltage window of 2 V is fabricated, showing a high energy density of 28.15 Wh·kg−1 at a power density of 745 W·kg−1. The specific capacitance drops to 65% retention after the first 500 cycles due to the element leaching effect and partial flaking of LMO/MnO, yet remains stable until 5000 cycles. It is the first time that La-based perovskite has been exploited for flexible supercapacitor applications, and further optimization is expected.