Journal
ADVANCED ENERGY MATERIALS
Volume 7, Issue 19, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201700629
Keywords
electrodes; hierarchically porous carbon; nanoporous carbon; pyropolymer; supercapacitors
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1A2B4009601, 2017R1C1B1004167]
- Industrial Strategic Technology Development Program - Ministry of Trade, Industry & Energy (MI, Korea) [10050477]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10050477] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017R1C1B1004167, 2016R1A2B4009601] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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