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Russell, Jake C; Posey, Victoria A; Gray, Jesse; May, Richard; Reed, Douglas A; Zhang, Hao; Marbella, Lauren E; Steigerwald, Michael L; Yang, Yuan; Roy, Xavier; Nuckolls, Colin; Peurifoy, Samuel R
Nature materials, 08/2021, Volume: 20, Issue: 8Journal Article
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 at a rate of 0.5 A g , stability over 50,000 cycles, and unprecedented performance at rates as high as 75 A g . 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.
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