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We present a low-cost approach for facile synthesis of nitrogen-doped porous carbons by utilising waste longan shell as carbon source and carbamide as additional nitrogen source through KOH activation at 600°C–900°C for 2hours under N2 atmosphere. The obtained porous carbons possess highly-developed ultra-micropores (approximately 0.6nm), an ultrahigh specific surface area (up to 3260 m2 g-1) and...
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