A New Free-Standing Aqueous Zinc-Ion Capacitor Based on MnO(2)-CNTs Cathode and MXene Anode.
A New Free-Standing Aqueous Zinc-Ion Capacitor Based on MnO(2)-CNTs Cathode and MXene Anode.
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基于 MnO2-CNTs 阴极和 MXene 阳极的新型独立式水系锌离子电容器
DOI：
10.1007/s40820-019-0301-1
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发表时间：
2019-08-26
影响因子：
26.6
通讯作者：
Ma Y
中科院分区：
文献类型：
--
作者：
Wang S;Wang Q;Zeng W;Wang M;Ruan L;Ma Y
将自支撑二氧化锰-碳纳米管（MnO 2-CNTs）电池型阴极和MXene（Ti 3C 2 Tx）电容器型阳极在水溶液电解液中组装成新型锌离子电容器（ZIC）。MXene阳极的大比电容避免了ZIC的阴极和阳极之间的电容失配。所提出的ZIC的上级性能使其成为下一代能量存储器件的有希望的候选者。本文的在线版本（10.1007/s40820-019-0301-1）包含补充材料，可供授权用户使用。受储能机理的限制，目前的储能装置存在一定的缺点，如电池的功率密度低，超级电容器的能量密度低。幸运的是，最近的离子电容器，例如包含电池型和电容器型电极的锂离子和钠离子电容器，可以允许实现高能量和功率密度。基于此，设计并实现了一种新型的锌离子电容器（ZIC），该电容器由独立的二氧化锰-碳纳米管（MnO 2-CNTs）电池型阴极和MXene（Ti 3C 2 Tx）电容器型阳极组成。ZIC可以避免锂离子和钠离子电容器在有机电解质中经常出现的不安全问题。正如预期的那样，ZIC在水性液体电解质中表现出优异的电化学性能（基于阴极和阳极的总重量），例如115.1F g-1的高比电容（1 mV s−1），98.6 Wh kg−1的高能量密度（77.5 W kg−1）、2480.6 W kg−1（29.7 Wh kg−1）的高功率密度以及约为初始电容（15，000次循环）的83.6%的高电容保持率。即使在水凝胶电解质中，ZIC也表现出优异的性能。这项工作为设计下一代高性能储能设备提供了一个重要的策略。本文的在线版本（10.1007/s40820-019-0301-1）包含补充材料，可供授权用户使用。
A new zinc-ion capacitor (ZIC) was realized by assembling the free-standing manganese dioxide–carbon nanotubes (MnO2–CNTs) battery-type cathode and MXene (Ti3C2Tx) capacitor-type anode in an aqueous electrolyte. The large specific capacitance of the MXene anode avoids the mismatch in capacitance between the cathode and anode of the ZIC. The superior performance of the proposed ZIC makes it a promising candidate for the next-generation energy storage devices. The online version of this article (10.1007/s40820-019-0301-1) contains supplementary material, which is available to authorized users. Restricted by their energy storage mechanism, current energy storage devices have certain drawbacks, such as low power density for batteries and low energy density for supercapacitors. Fortunately, the nearest ion capacitors, such as lithium-ion and sodium-ion capacitors containing battery-type and capacitor-type electrodes, may allow achieving both high energy and power densities. For the inspiration, a new zinc-ion capacitor (ZIC) has been designed and realized by assembling the free-standing manganese dioxide–carbon nanotubes (MnO2–CNTs) battery-type cathode and MXene (Ti3C2Tx) capacitor-type anode in an aqueous electrolyte. The ZIC can avoid the insecurity issues that frequently occurred in lithium-ion and sodium-ion capacitors in organic electrolytes. As expected, the ZIC in an aqueous liquid electrolyte exhibits excellent electrochemical performance (based on the total weight of cathode and anode), such as a high specific capacitance of 115.1 F g−1 (1 mV s−1), high energy density of 98.6 Wh kg−1 (77.5 W kg−1), high power density of 2480.6 W kg−1 (29.7 Wh kg−1), and high capacitance retention of ~ 83.6% of its initial capacitance (15,000 cycles). Even in an aqueous gel electrolyte, the ZIC also exhibits excellent performance. This work provides an essential strategy for designing next-generation high-performance energy storage devices. The online version of this article (10.1007/s40820-019-0301-1) contains supplementary material, which is available to authorized users.
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