Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 2, Pages 739-748Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b01394
Keywords
hierarchically porous carbon foam; supercapacitor; in situ doping; reactive template; confined self-activation
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Funding
- National Natural Science Foundation of China [21676127, 21776110]
- Natural Science Foundation of Jiangsu Province [BK20170532, BK20160568, BK20160501]
- China Postdoctoral Science Foundation [2017M620194]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1701023A]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China [17KJB430011]
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Herein, we report a new reactive template and confined self-activation strategy for the preparation of three-dimensional interconnected hierarchically porous N/O-doped carbon foam (3DHPNCF), which contains abundant micropores, mesopores, and macropores via using mesoporous silica SBA-15 as a hard template and ethylenediaminetetraacetic acid tripotassium (EDTA-3K) as a single carbon/nitrogen precursor, respectively. Importantly, potassium carbonate produced by the pyrolysis of EDTA-3K can effectively react with the SBA-15 silica skeleton to form water-soluble potassium silicate, after hot-water removal, leading to a continuous macropore structure. Simultaneously, a confined alkali activation reaction is carried out between potassium carbonate and in situ as-formed carbon to create meso/micropores. 3DHPNCF exhibits the high specific surface area and pore volume, as well as rich content of in situ-doped oxygen/nitrogen element, contributing to the high specific capacitance, good rate capability, and outstanding cycling stability. We provide a novel, green, and universal strategy for the design and fabrication of novel hierarchically porous carbons.
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