Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide
Cation Intercalation and High Volumetric Capacitance of Two-Dimensional Titanium Carbide
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DOI：
10.1126/science.1241488
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发表时间：
2013-09-27
期刊：
影响因子：
56.9
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Lukatskaya, Maria R.;Mashtalir, Olha;Gogotsi, Yury
离子嵌入层状化合物的方法在电池和电化学电容器等储能装置中得到了广泛的应用。然而，很少有比锂大得多的离子被发现。我们证明了阳离子在二维（2D） Ti3C2 MXene层之间的自发插层。MXenes将二维导电碳化物层与亲水性，主要是羟基端接表面结合在一起。各种阳离子，包括Na+， K+, NH4+， Mg2+和Al3+，也可以通过电化学插入，提供超过300法拉/立方厘米的电容（远高于多孔碳）。该研究为探索一大类二维碳化物和碳氮化物在单价和多价离子电化学储能中的应用奠定了基础。
The intercalation of ions into layered compounds has long been exploited in energy storage devices such as batteries and electrochemical capacitors. However, few host materials are known for ions much larger than lithium. We demonstrate the spontaneous intercalation of cations from aqueous salt solutions between two-dimensional (2D) Ti3C2 MXene layers. MXenes combine 2D conductive carbide layers with a hydrophilic, primarily hydroxyl-terminated surface. A variety of cations, including Na+, K+, NH4+, Mg2+, and Al3+, can also be intercalated electrochemically, offering capacitance in excess of 300 farads per cubic centimeter (much higher than that of porous carbons). This study provides a basis for exploring a large family of 2D carbides and carbonitrides in electrochemical energy storage applications using single- and multivalent ions.