Rapid and Efficient Redox Processes within 2D Covalent Organic Framework Thin Films
Rapid and Efficient Redox Processes within 2D Covalent Organic Framework Thin Films
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DOI：
10.1021/acsnano.5b00184
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发表时间：
2015-03-01
期刊：
影响因子：
17.1
通讯作者：
Dichtel, William R.
中科院分区：
文献类型：
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作者：
DeBlase, Catherine R.;Hernandez-Burgos, Kenneth;Dichtel, William R.
二维共价有机框架（2D（COF））理想地适合于将氧化还原活性亚基组织成感兴趣的周期性、永久性多孔聚合物网络，用于赝电容能量存储。在这里，我们描述了一种用于合成氧化还原活性的2D COF在Au工作电极上的结晶取向薄膜的方法。COF膜的厚度通过改变初始单体浓度来控制。大百分比（80-99%）的蒽醌基团在薄于200-nm的膜中是电化学可接近的，比相同的（作为随机取向的微晶粉末制备的COF）提高了一个数量级。结果，与用随机取向的COF粉末官能化的电极相比，用取向的COF膜官能化的电极表现出按比例缩放到电极面积的电容增加400%。这些结果证明了氧化还原活性COF用于电能储存的前景，并突出了控制形态以获得最佳性能的重要性。
Two-dimensional covalent organic frameworks (2D (COFs) are ideally suited for organizing redox-active subunits into periodic, permanently porous polymer networks of interest for pseudocapacitive energy storage. Here we describe a method for synthesizing crystalline, oriented thin films of a redoxactive 2D COF on Au working electrodes. The thickness of the COF film was controlled by varying the initial monomer concentration. A large percentage (80-99%) of the anthraquinone groups are electrochemically accessible in films thinner than 200-nm, an order of magnitude improvement over the same (COF prepared as a randomly oriented microcrystalline powder. As a result, electrodes functionalized with oriented COF films exhibit a 400% increase in capacitance scaled to electrode area as compared to those functionalized with the randomly oriented COF powder. These results demonstrate the promise of redox-active COFs for electrical energy storage and highlight the importance of controlling morphology for optimal performance.