Synthesis of P, S, N, Triple‐Doped Porous Carbon from Steam Explosion Pretreated Peanut Shell as Electrode Material Applied on Supercapacitor. Issue 6 (25th March 2022)

• Record Type: Journal Article
• Authors: Li, Xin; Ding, Dayong; Liu, Zhong; Hui, Lanfeng; Guo, Taoli; You, Tingting; Cao, Yunpeng; Zhao, Yumeng
• Is Part Of: ChemElectroChem. Volume 9:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-25
• Subjects: biomass waste -- triple-doping -- potassium phosphate -- thiourea -- supercapacitor; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202200035
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Triple‐doped (P, S and N) peanut‐shell carbon (PSN‐PSC) was fabricated by a flexible one‐step strategy. The obtained carbon displayed large specific surface area and multiple porous structures, hence it was suitable in applying on supercapacitor as electrode materials. Steam explosion was performed to pretreat peanut shells for the purpose of preliminarily creating pore structure. Potassium phosphate was used as activating agent and supplied phosphorus atom. Thiourea was added as pore‐generating agent, as well as nitrogen and sulfur sources. The extremely high specific surface area (2046 m 2 g −1 ) and hierarchical porous structure of the PSN‐PSC increased the accessibility of the carbon surface to the electrolyte, which shortened the ion diffusion pathway. Besides, the heteroatoms (P, S, N) doping improved the ability of energy storage and capacitive property. The synergistic effect of heteroatom doping and hierarchical structure endowed PSN‐PSC with the highest specific capacitance of 334.7 F g −1 at 0.1 A g −1 and with remarkable cycle stability of 96 % retention for 10000 cycles in 6 m KOH electrolyte in a three‐electrode system with a 3.0 mg cm −2 mass loading of PSN‐PSC. Furthermore, the PSN‐PSC symmetric supercapacitor reached an excellent energy density of 19.92 Wh kg −1 under 70 W kg −1 in a 6 m KOH electrolyte. This work demonstrates a novel, convenient method for fabricating heteroatom doped carbon electrode materials, especially based on pretreated biomass wastes. Abstract : No wasting of waste : Steam explosion pretreated biomass waste of peanut shell was applied to synthesize porous carbon via K3 PO4 activation. K3 PO4 was also supplied for phosphorus atom doping. Thiourea was added to serve as nitrogen and sulfur sources. The prepared triple‐doped porous carbon (PSN‐PSC) revealed super large specific surface area (2046 m 2 g −1 ) and highest specific capacitance of 334.7 F/g at 0.1 A/g and remarkable cycling stability of 97 % after 5000 cycles in 6 m KOH electrolyte in a three‐electrode system.