Details

Autor(en) / Beteiligte

• Zhao, Yulai
• Zhu, Zhongzheng
• Wang, Anjun
• Xiao, Longqiang
• Hou, Linxi

Titel

Facile synthesis of N, S co-doped hierarchical porous carbon/MnO2 composites for supercapacitor electrodes via sodium alginate crosslinking

Ist Teil von

• Journal of alloys and compounds, 2022-11, Vol.923, p.166333, Article 166333

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• Porous carbon materials have been widely used as electrode materials for supercapacitors. However, low specific capacitance severely hinders the practical application. To further improve the capacitance, this work reports a facile approach to prepare N, S co-doped hierarchical porous carbon/MnO2 composites (NSPC/MnO2). Acidified thiourea, acting as N and S source, is used to crosslink sodium alginate (SA) to give SA-based composite gels which are pyrolyzed to produce NSPC/MnO2. X-ray diffraction and X-ray photoelectron spectra proved that manganese exists in the porous carbon in the form of MnO2. The obtained NSPC/MnO2 exhibit hierarchical porous structure, remarkable mesoporous feature (the proportion of mesopores and macropores reached 32.69%), and high specific surface area of 1701 m2 g−1. Meanwhile, NSPC/MnO2 show abundant heteroatom doping, i.e. Mn (2.05 at%), N (6.76 at%), and S (2.16 at%), which provided plenty of pseudocapacitance. The electrochemical tests show that NSPC/MnO2 as electrode material can reach a high specific capacity of 281.1 F g−1 at 1 A g−1 (which is almost 1.85 times higher than the comparative sample), with good cycling stability (86.02% after 5000 cycles at 10 A g−1). [Display omitted] •NSPC-MnO2 was prepared from sodium alginate by the one-step carbonization method.•The loaded MnO2 brought rich mesoporous structure and a large amount of pseudocapacitance to the porous carbon.•NSPC-MnO2 exhibited excellent electrochemical performance (specific capacitance of 281.1 F g−1 at 1 A g−1）.