Facile synthesis of novel graphene sponge for high performance capacitive deionization.
Facile synthesis of novel graphene sponge for high performance capacitive deionization.
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轻松合成用于高性能电容去离子的新型石墨烯海绵
DOI：
10.1038/srep08458
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发表时间：
2015-02-13
影响因子：
4.6
通讯作者：
Chua DH
中科院分区：
文献类型：
--
作者：
Xu X;Pan L;Liu Y;Lu T;Sun Z;Chua DH
电容去离子（CDI）是一种有效的海水淡化技术，提供了一个适当的途径，以获得清洁的水。为了获得优异的CDI性能，合理设计电极材料的结构已成为CDI应用的迫切需要。在这项工作中，一种新型的石墨烯海绵（GS）的CDI电极首次提出。通过直接冷冻干燥氧化石墨烯溶液然后在氮气气氛中退火来制备GS。采用扫描电子显微镜、拉曼光谱、氮气吸附-脱附、X射线光电子能谱、循环伏安和电化学阻抗谱对GS的形貌、结构和电化学性能进行了表征。研究了GS在NaCl溶液中的电吸附性能，并与原始石墨烯（PG）进行了比较。结果表明，由于独特的3D互连多孔结构，大的可及表面积和低的电荷转移电阻，GS电极在初始NaCl浓度为~500 mg L−1时表现出14.9 mg g−1的电化学吸附容量，约为PG（4.64 mg g−1）的3.2倍，据我们所知，这应该是目前报道的石墨烯电极在类似实验条件下的最高值。 这些结果表明，GS应该是一个有前途的候选人的CDI电极。
Capacitive deionization (CDI) is an effective desalination technique offering an appropriate route to obtain clean water. In order to obtain excellent CDI performance, a rationally designed structure of electrode materials has been an urgent need for CDI application. In this work, a novel graphene sponge (GS) was proposed as CDI electrode for the first time. The GS was fabricated via directly freeze-drying graphene oxide solution followed by annealing in nitrogen atmosphere. The morphology, structure and electrochemical performance of GS were characterized by scanning electron microscopy, Raman spectroscopy, nitrogen adsorption-desorption, X-ray photoelectron spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The electrosorption performance of GS in NaCl solution was studied and compared with pristine graphene (PG). The results show that due to the unique 3D interconnected porous structure, large accessible surface area and low charge transfer resistance, GS electrode exhibits an ultrahigh electrosorption capacity of 14.9 mg g−1 when the initial NaCl concentration is ~500 mg L−1, which is about 3.2 times of that of PG (4.64 mg g−1), and to our knowledge, it should be the highest value reported for graphene electrodes in similar experimental conditions by now. These results indicate that GS should be a promising candidate for CDI electrode.
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