Rational Design of Titanium Carbide MXene Electrode Architectures for Hybrid Capacitive Deionization
Rational Design of Titanium Carbide MXene Electrode Architectures for Hybrid Capacitive Deionization
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DOI：
10.1002/eem2.12110
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发表时间：
2020-09-01
影响因子：
15
通讯作者：
Gogotsi, Yury
中科院分区：
文献类型：
--
作者：
Buczek, Samantha;Barsoum, Michael L.;Gogotsi, Yury
嵌入氧化还原材料由于可利用的法拉第廊道位置而显示出用于高效水脱盐的巨大前景。以前使用MXene证明的对称电容去离子（CDI）电池通常在其盐吸附容量（SAC）和操作电压窗口方面受到限制。在这项研究中，设计了无集流体和无粘合剂的Ti 3C 2 Tx MXene电极结构，其中多孔碳作为正极以展示混合CDI（HCDI）操作。此外，MXene集流体通过采用可扩展的刮刀涂布技术并随后喷涂一层小薄片MXene分散体来制造。MXene的亲水性氧化还原活性通道能够插入各种水性阳离子，包括Na+、K+和Mg 2+离子，显示出高达250 F cm（-3）的体积电容。结果，实现了39 mg g（-1）的盐去除能力，具有良好的循环稳定性。这项研究为开发用于HCDI应用的独立式、无粘合剂和无添加剂的MXene电极开辟了新的途径。
Intercalation redox materials have shown great promise for efficient water desalination due to available faradaic gallery sites. Symmetric capacitive deionization (CDI) cells previously demonstrated using MXenes were often limited in their salt adsorption capacity (SAC) and voltage window of operation. In this study, current collector- and binder-free Ti3C2Tx MXene electrode architectures are designed with porous carbon as the positive electrode to demonstrate hybrid CDI (HCDI) operation. Furthermore, MXene current collectors are fabricated by employing a scalable doctor blade coating technique and subsequently spray coating a layer of a small flake MXene dispersion. Hydrophilic redox-active galleries of MXenes are capable of intercalating a variety of aqueous cations including Na+, K+, and Mg2+ ions, showing volumetric capacitances up to 250 F cm(-3). As a result, a salt removal capacity of 39 mg g(-1) with decent cycling stability is achieved. This study opens new avenues for developing freestanding, binder- and additive-free MXene electrodes for HCDI applications.