Polyacrylamide hydrogel-derived three-dimensional hierarchical porous N, S co-doped carbon frameworks for electrochemical capacitors. (7th December 2020)

• Record Type: Journal Article
• Authors: Meng, Xiaotang; Zhang, Jinyang; Chen, Qiuli; Hou, Linrui; Yuan, Changzhou
• Is Part Of: New journal of chemistry. Volume 44:Number 48(2020)
• Page Start: 21279
• Page End: 21287
• Publication Date: 2020-12-07
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d0nj04942e
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Polyacrylamide hydrogel-derived 3D porous hierarchical N, S co-doped carbon frameworks are purposefully fabricated, and exhibit superior electrochemical capacitance in both alkaline and acidic electrolytes. Abstract : Cost-effective porous carbon materials have been widely used in advanced electrochemical capacitors (ECs). Herein, we developed a simple yet scalable method to fabricate a porous hierarchical N, S co-doped carbon framework (HNSC-F) using a polyacrylamide hydrogel (PAAG) soaked with CH4 N2 S as a precursor. The HNSC-F is endowed with a large surface area of ∼1192.1 m 2 g −1, microporosity of ∼91.8%, high surface wettability, and a high O content of ∼8.4 at%, N ∼ 5.3 at% and S ∼ 0.8 at%. When evaluated as an electroactive material for ESs, the resulting HNSC-F electrode with a loading of 5 mg cm −2 delivers a specific capacitance (SC) of ∼254.4 F g −1 in 6 M KOH, and even ∼325.8 F g −1 at 1 M H2 SO4 at 0.5 A g −1, owing to the extra heteroatom-involved faradaic reaction. Furthermore, the HNSC-F-based symmetric device with 6 M KOH exhibits a high energy density of ∼10.3 W h kg −1 at ∼325.0 W kg −1 within an operating window of an upper voltage limit of 1.3 V. Moreover, the symmetric ECs exhibit excellent SC retention with both alkaline (∼102.3%) and acidic (∼96.5%) electrolytes even after 5000 consecutive cycles. This promises the HNSC-F as a competitive electrode for advanced ECs.