Rapid synthesis of porous manganese cobalt sulfide grown on Ni foam by microwave method for high performance supercapacitors

• Published in: Synthetic metals 2019-10, Vol.256, p.116113, Article 116113
• Main Authors: Wang, Fangping, Zhou, Kailing, Zheng, Jinfeng, Ma, Jing
• Format: Article
• Language: English
• Subjects: Activated carbon; Asymmetric supercapacitor; Asymmetry; Capacitance; Cobalt sulfide; Crosslinking; Diodes; Electrode materials; Electrodes; Energy storage; Flux density; Light emitting diodes; Manganese; Manganese cobalt sulfide; Metal foams; Microwave; Nickel; Supercapacitors; Synthesis
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2019.116113

•The openporous structure MCS/NF was first prepared successfully by microwave method.•The synthesis process is simple, convenient and greatly shortens the reaction time.•This electrode exhibits a high specific capacitance of 2084 F/g at 1A/g.•MCS/NF exhibits a high energy density of 48 Wh kg−1 at 240 W kg−1. In this paper, a simple, low-cost and fast microwave technology of growing vertically cross-linked manganese cobalt sulfide (MCS) on Ni foam (NF) is successfully developed for the first time. As a binder-free electrode for supercapacitors and delivers high capacitance of 2084 F g−1 at 1 A g−1, excellent rate performance (1200 F g−1 at 100 A g−1) and good cycling stability (80.6% capacitance retention after 5000 cycles). In addition, a asymmetric supercapacitor (ASC) is composed of MCS/NF as positive electrode and activated carbon (AC) as negative electrode. The asymmetric supercapacitor achieves a remarkable performance with a specific capacitance of 134.6 F g−1, an energy density of 48 Wh kg−1, and a power density of 11.8 kW kg−1, which is able to light up a light-emitting diode. This work not only provides a green and rapid synthesis method for preparing electrode materials, but also provides an innovative idea.