Amphicharge‐Storable Pyropolymers Containing Multitiered Nanopores |
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| Authors: | Na Rae Kim Sang Moon Lee Min Wook Kim Hyeon Ji Yoon Won G Hong Hae Jin Kim Hyoung Jin Choi Hyoung‐Joon Jin Young Soo Yun |
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| Institution: | 1. Department of Polymer Science and Engineering, Inha University, Incheon, South Korea;2. Division of Electron Microscopic Research, Korea Basic Science Institute (KBSI), Daejeon, South Korea;3. Department of Chemical Engineering, Kangwon National University, Samcheok, South Korea |
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| Abstract: | In this study, hierarchically nanoporous pyropolymers (HN‐PPs) including numerous redox‐active heteroatoms are fabricated from polyaniline nanotubes by heating with KOH. In the large operating voltage range 1.0–4.8 V versus Li+/Li, HN‐PPs store amphicharges by a pseudocapacitive manner of Li‐ion (mainly <3.0 V) and electrochemical double layer formation of anion (primarily >3.0 V). Through these surface‐driven charge storage behaviors, HN‐PPs achieve a significantly high specific capacity of ≈460 mA h g?1 at 0.5 A g?1, maintaining specific capacities of 140 mA h g?1 at a high specific current of 30 A g?1 and 305 mA h g?1 after 2000 cycles at 3 A g?1. Furthermore, asymmetric energy storage devices based on HN‐PPs deliver a high specific energy of 265 W h kg?1 and high specific power of 5081 W kg?1 with long‐term cycling performance. |
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| Keywords: | electrodes hierarchically porous carbon nanoporous carbon pyropolymer supercapacitors |
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