Hierarchical porous active carbon from fallen leaves by synergy of K2CO3 and their supercapacitor performance》.pdf

Journal of Power Sources 299 (2015) 519 e528 Contents lists available at ScienceDirect Journal of Power Sources journal homepage: /locate/jpowsour Hierarchical porous active carbon from fallen leaves by synergy of K2CO3 and their supercapacitor performance Yin-Tao Li a, Yu-Tong Pi a, Li-Ming Lu a, Shun-Hua Xu a, Tie-Zhen Ren a, b, * a School of Chemical Engineering Technology, Hebei University of Technology, Tianjin 300130, China b Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China h i g h l i g h t s g r a p h i c a l a b s t r a c t Hierarchical porous active carbon is prepared by activation treatment. The fallen leaves are used as the carbon source. The use of mixed K CO /KOH can 2 3 create the hierarchical pores on carbon. The capacitance of ACs is 242 F/g at 0.3 A g1 in two-electrode system. The capacitance has no decrease after 2000 cycles. a r t i c l e i n f o a b s t r a c t Article history: The active carbon materials (ACs) derived from fallen leaves (FLs) are prepared by the activations of Received 27 June 2015 mixed KOH and K CO . Characterizations reveal that the use of single activator KOH creates the most of 2 3 Received in revised form micropores in three dimensional and K2CO3 produces the mesopores/macropores mostly in shallow. 6 September 2015