Construction of S-doped hierarchical porous carbons by acid-free treatment strategy for supercapacitors

• Published in: E3S Web of Conferences Vol. 228; p. 1007
• Main Authors: Yang, Lei, Jin, BiYu, Li, Hong Qiang, Wu, Ting Ting, He, Xiao Jun
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 01.01.2021
• Subjects: Capacitance; Coal tar; Electrode materials; Electrodes; Energy storage; Functional groups; Industrial applications; Retention; Structural hierarchy; Supercapacitors; Sustainable development
• ISSN: 2267-1242; 2555-0403; 2267-1242
• DOI: 10.1051/e3sconf/202122801007

The pollution from acid treatment process in the preparation process of hierarchical porous carbons is a substantial challenge for industrial application of supercapacitors (SCs), which necessitates the development of green alternative technologies. In this work, S-doped hierarchical porous carbons (S-HPCs) are prepared from cheap coal tar pitch by a less harmful in situ KHCO 3 activation strategy. The sample obtained at 800°C (S-HPC 800 ) possesses 3D framework structure with hierarchical pores, large specific surface area (1485 m 2 g -1 ) and O, S-containing functional groups. Due to these synergistic characteristics, SHPC 800 as supercapacitor electrode exhibits high specific capacitance of 246 F g -1 at 0.1 A g -1 with a capacitance retention of 68.3% at 40 A g -1 and excellent cycle stability with 96.7% capacitance retention after 10, 000 charge-discharge cycles. This work provides an environmentally friendly approach to prepare advanced carbon-based electrode materials from industrial by-products for energy storage devices.