High-performance organic pseudocapacitors via molecular contortion
High-performance organic pseudocapacitors via molecular contortion
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DOI：
10.1038/s41563-021-00954-z
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发表时间：
2021-04-01
期刊：
影响因子：
41.2
通讯作者：
Peurifoy, Samuel R.
中科院分区：
文献类型：
--
作者：
Russell, Jake C.;Posey, Victoria A.;Peurifoy, Samuel R.
伪电容利用独特的电荷存储机制来实现高容量、快速循环的设备。本文描述了一种由二苯二亚胺和六氮杂环萘组成的有机体系，它在0.5Ag(-1)的速率下表现出689Fg(-1)的比容，在50000次循环中表现出稳定的性能，在75Ag(-1)的速率下表现出前所未有的性能。我们将这种材料集成到双电极装置中，以实际展示其在下一代储能系统中的潜力。我们通过光谱、计算和电化学测量相结合的方法，确定了这种异常高速率电荷存储的来源是表面介导型假电容。通过强调分子扭曲和互补电子属性在分子组分选择中的重要性，这些结果为创造有机高性能储能材料提供了一般策略。伪电容器表现出电荷储存机制，导致高容量和快速循环的器件。通过分子扭曲设计的有机体系现在被证明具有前所未有的电化学性能和稳定性。
Pseudocapacitors harness unique charge-storage mechanisms to enable high-capacity, rapidly cycling devices. Here we describe an organic system composed of perylene diimide and hexaazatrinaphthylene exhibiting a specific capacitance of 689 F g(-1) at a rate of 0.5 A g(-1), stability over 50,000 cycles, and unprecedented performance at rates as high as 75 A g(-1). We incorporate the material into two-electrode devices for a practical demonstration of its potential in next-generation energy-storage systems. We identify the source of this exceptionally high rate charge storage as surface-mediated pseudocapacitance, through a combination of spectroscopic, computational and electrochemical measurements. By underscoring the importance of molecular contortion and complementary electronic attributes in the selection of molecular components, these results provide a general strategy for the creation of organic high-performance energy-storage materials.Pseudocapacitors exhibit charge-storage mechanisms leading to high-capacity and rapidly cycling devices. An organic system designed via molecular contortion is now shown to exhibit unprecedented electrochemical performance and stability.