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Carbon Quantum Dot-Induced MnO2 Nanowire Formation and Construction of a Binder-Free Flexible Membrane with Excellent Superhydrophilicity and Enhanced Supercapacitor Performance
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsami.7b14761
Haipeng Lv 1 , Xiujiao Gao 1 , Qunjie Xu 1 , Haimei Liu 1 , Yong-Gang Wang 2 , Yongyao Xia 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsami.7b14761
Haipeng Lv 1 , Xiujiao Gao 1 , Qunjie Xu 1 , Haimei Liu 1 , Yong-Gang Wang 2 , Yongyao Xia 2
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Manganese oxides (MnO2) are regarded as typical and promising electrode materials for supercapacitors. However, the practical electrochemical performance of MnO2 is far from its theoretical value. Nowadays, numerous efforts are being devoted to the design and preparation of nanostructured MnO2 with the aim of improving its electrochemical properties. In this work, ultralong MnO2 nanowires were fabricated in a process induced by carbon quantum dots (CQDs); subsequently, a binder-free flexible electrode membrane was easily obtained by vacuum filtration of the MnO2 nanowires. The effects of the CQDs not only induced the formation of one-dimensional nanostructured MnO2, but also significantly improved the wettability between electrode and electrolyte. In other words, the MnO2 membrane demonstrated a superhydrophilic character in aqueous solution, indicating the sufficient and abundant contact probability between electrode and electrolyte. The binder-free flexible MnO2 electrode exhibited a preeminent specific capacitance of 340 F g–1 at 1 A g–1; even when the current density reached 20 A g–1, it still maintained 260 F g–1 (76% retention rate compared to that at 1 A g–1). Moreover, it also showed good cycling stability with 80.1% capacity retention over 10 000 cycles at 1 A g–1. Furthermore, an asymmetric supercapacitor was constructed using the MnO2 membrane and active carbon as the positive and negative electrodes, respectively, which exhibited a high energy density of 33.6 Wh kg–1 at 1.0 kW kg–1, and a high power density of 10 kW kg–1 at 12.5 Wh kg–1.
中文翻译：
碳量子点诱导的MnO 2纳米线的形成和无粘结剂柔性膜的制备，该膜具有优异的超亲水性和增强的超级电容器性能
锰氧化物（MnO 2）被认为是超级电容器的典型电极材料。但是，MnO 2的实际电化学性能远没有达到理论值。如今，为了改善其电化学性能，正在致力于设计和制备纳米结构的MnO 2。在这项工作中，超长MnO 2纳米线是在碳量子点（CQDs）诱导的过程中制造的。随后，通过真空过滤MnO 2纳米线容易获得无粘合剂的柔性电极膜。CQD的作用不仅诱导了一维纳米结构的MnO 2的形成，但也显着改善了电极与电解质之间的润湿性。换句话说，MnO 2膜在水溶液中表现出超亲水性，表明电极与电解质之间具有足够的，充足的接触概率。无粘接剂的挠性的MnO 2电极表现出340 F G一个卓越的比电容-1 1 A G -1 ; 即使当电流密度达到20 A g –1时，它仍然保持260 F g –1（与1 A g –1时相比，保留率为76％）。此外，它还显示出良好的循环稳定性，在1 A g –1的10000次循环中，容量保持率为80.1％。此外，分别使用MnO 2膜和活性炭作为正电极和负电极构造了不对称超级电容器，它们在1.0 kW kg –1时表现出33.6 Wh kg –1的高能量密度，在10 kW时的高功率密度12.5千克公斤–1时，千瓦千克–1。
更新日期：2017-11-08
中文翻译：
碳量子点诱导的MnO 2纳米线的形成和无粘结剂柔性膜的制备，该膜具有优异的超亲水性和增强的超级电容器性能
锰氧化物（MnO 2）被认为是超级电容器的典型电极材料。但是，MnO 2的实际电化学性能远没有达到理论值。如今，为了改善其电化学性能，正在致力于设计和制备纳米结构的MnO 2。在这项工作中，超长MnO 2纳米线是在碳量子点（CQDs）诱导的过程中制造的。随后，通过真空过滤MnO 2纳米线容易获得无粘合剂的柔性电极膜。CQD的作用不仅诱导了一维纳米结构的MnO 2的形成，但也显着改善了电极与电解质之间的润湿性。换句话说，MnO 2膜在水溶液中表现出超亲水性，表明电极与电解质之间具有足够的，充足的接触概率。无粘接剂的挠性的MnO 2电极表现出340 F G一个卓越的比电容-1 1 A G -1 ; 即使当电流密度达到20 A g –1时，它仍然保持260 F g –1（与1 A g –1时相比，保留率为76％）。此外，它还显示出良好的循环稳定性，在1 A g –1的10000次循环中，容量保持率为80.1％。此外，分别使用MnO 2膜和活性炭作为正电极和负电极构造了不对称超级电容器，它们在1.0 kW kg –1时表现出33.6 Wh kg –1的高能量密度，在10 kW时的高功率密度12.5千克公斤–1时，千瓦千克–1。
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