Electrochemical performance of water soluble pitch-based porous carbons

doi:10.19799/j.cnki.2095-4239.2020.0053

Abstract

Abstract:

Supercapacitors are widely researched energy-storage systems with many unique characteristics: ultrahigh power density, fast chargedischarge capability, high security, and excellent cycle stability. Porous carbon materials with high Brunauer Emmett Teller (BET) surface area and reasonable pore size distribution are ideal candidates for supercapacitor electrode materials. A simple strategy was used to fabricate the water-soluble pitch-based porous carbons (WPCs) using water soluble pitch (WP) as the precursor and Na₂CO₃ as the activating agent. The rational design of three-dimensional (3D) hierarchical porous architecture enables the material to have excellent properties. The BET specific surface area of the as-obtained WPCs reached 1912 m²/g. Moreover, supercapacitor electrodes based on the WPCs achieved a high specific capacitance (232 F/g at 0.05 A/g) and good cyclic stability (capacitance retention=97.5% after 5000 charge-discharge cycles at 2.0 A/g). This facile synthesis strategy will promote the commercial application of WPCs in supercapacitors.

Key words: water soluble pitch, porous carbons, supercapacitors, Na₂CO₃

CLC Number:

TM 53

ZHANG Jinliang, KANG Danmiao, LIU Junqing, SU Zhijiang, LIANG Wenbin. Electrochemical performance of water soluble pitch-based porous carbons[J]. Energy Storage Science and Technology, 2020, 9(3): 743-750.

Figures/Tables 13

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样品	比表面积/m²·g^-1	总孔容/cm³·g^-1	中孔孔容/cm³· g^-1	中孔孔容比例/%
WPC-650	817	0.36	0.02	5.6
WPC-750	1244	0.58	0.05	8.6
WPC-850	1912	0.94	0.17	18.1
WPC-950	1837	0.88	0.12	13.6
WP-850	70	0.04	0.004	10

样品	元素组成/%			N 1s含量/%
样品	C	N	O	S	N-6	N-5	N-Q
WP	56.73	1.29	41.78	0.20	16.4	83.6	0
WPC-650	75.63	2.03	21.97	0.37	21.2	71.0	7.8
WPC-750	77.03	1.54	21.33	0.09	8.3	84.4	7.2
WPC-850	84.60	0.50	14.77	0.12	0	100	0
WPC-950	83.99	0.38	15.49	0.14	0	100	0

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