Soybean root-derived N, O co-doped hierarchical porous carbon for supercapacitors

• Published in: Applied surface science Vol. 555; p. 149726
• Main Authors: Zhao, Chongjun, Ding, Yiwen, Huang, Yaoxuan, Li, Nan, Hu, Yaqi, Zhao, Chunhua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.07.2021
• Subjects: Hierarchical pores; N,O co-doped; One-step carbonization-activation; Soybean root-derived carbon; Supercapacitors; Supercapacitors; One-step carbonization-activation; Soybean root-derived carbon; N,O co-doped; Hierarchical pores
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2021.149726

Schematic illustration of the preparation of soybean root-derived carbon. [Display omitted] •Nitrogen-contained soybean roots were in-situ converted into N, O co-doped activated carbon.•3D hierarchical porous structure with high specific surface area of 1801 m2 g−1.•Pyrrole nitrogen and pyridinium nitrogen.•SRC-based electrode: Specific capacitance of 269.4 F g−1 at 1 A g−1, 97% retention after 20, 000 cycles.•SRC-based SSC: 2.0 V of voltage window, 80.9% retention upon 10-fold current density (0.5 A g−1 vs. 5 A g−1). 3D hierarchical porous soybean root-derived carbon (SRC) is successfully developed from N, O-contained natural soybean root through a convenient one-step carbonization activation route. SRC own abundant hierarchical pores, great specific surface area and considerable N and O elements. As-prepared carbon-based electrode exhibits specific capacitance of 269.4 F g−1 at 1 A g−1 and capacitance retention (97% after 20,000 charge and discharge cycles), while assembled symmetric supercapacitor (SSC) has an operating voltage window of 2.0 V and energy density of 23.0 Wh kg−1 at the power density of 500 W kg−1. This work makes natural soybean root be utilized as 3D heteroatom-doped carbon and provide another alternative strategy for high-performance electrode materials.