Abstract
Heteroatom-doped carbon materials have attracted immense interest as advanced supercapacitor electrode materials due to their unique properties. A carbon cloth-supported, nitrogen-doped carbon “spider web” network full of macropores and mesopores is developed via the pyrolysis of polyaniline nanofibers in ammonia atmosphere. The presence of mesopores and macropores can provide ion-buffering reservoirs to shorten the ion diffusion distance to the interior part of the carbon network. Carbonization in ammonia introduced N heteroatoms through gas phase chemical reactions between ammonia and the oxygen functionalities on the carbon surface. The enhanced ion-accessible surface area and improved charge transfer rate can be achieved. The N-doped carbon “spider web” exhibited a high specific capacitance of 266 F/g at a scan rate of 2 mV/s. Even when the scan rate was increased to 500 mV/s, 61% of its capacitance could still be retained, evidencing its excellent rate performance. The demonstrated strategy is anticipated to be generally effective for preparing heteroatom-doped carbon electrodes with other polymers.
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ACKNOWLEDGMENTS
Xiao-Xia Liu gratefully acknowledges financial support from National Natural Science Foundation of China (Nos. 21273029 and 21673035). Yat Li acknowledges support by National Aeronautics and Space Administration (NASA) Grant No. NNX15AQ01. Yu Song acknowledges the financial support from China Scholarship Council. We also acknowledge the help for SEM image acquisition offered by Dr. Tom Yuzvinsky from the W.M. Keck Center for Nanoscale Opto-fluidics at the University of California, Santa Cruz.
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Song, Y., Qin, Z., Huang, Z. et al. Nitrogen-doped carbon “spider webs” derived from pyrolysis of polyaniline nanofibers in ammonia for capacitive energy storage. Journal of Materials Research 33, 1109–1119 (2018). https://doi.org/10.1557/jmr.2017.443
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DOI: https://doi.org/10.1557/jmr.2017.443