NiCoSe 4 nanoparticles derived from nickel-cobalt Prussian blue analogues on N-doped reduced graphene oxide for high-performance asymmetric supercapacitors

• Published in: Nanotechnology Vol. 33; no. 34; p. 345401
• Main Authors: Yang, Quanlu, Feng, Qiaoliang, Xu, Xin, Liu, Yang, Yang, Xuexue, Yang, Fawang, Li, Jiankun, Zhan, Huiying, Wang, Qianshan, Wu, Shang
• Format: Journal Article
• Language: English
• Published: England 20.08.2022
• Subjects: nanoparticles; reduced graphene oxide; Prussian blue analogue; supercapacitor
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/1361-6528/ac6ff2

Synthesis of NiHCCo precursors via simple co-precipitation and nickel-cobalt tetraselenide composites grown on nitrogen-doped reduced graphene oxide (NiCoSe /N-rGO) were fabricated using solvothermal method. The introduction of N-rGO used as a template effectively prevented agglomeration of NiCoSe nanoparticles and provided more active sites, which greatly increased the electrochemical and electrical conductivity for NiCoSe /N-rGO. NiCoSe /N-rGO-20 presents a remarkably elevated specific capacity of 120 mA h g under current density of 1 A g . NiCoSe /N-rGO-20 demonstrates an excellent cycle life and achieves a remarkable 83% retention rate over 3000 cycles with 10 A g . NiCoSe /N-rGO-20//N-rGO asymmetric supercapacitor was constructed based on the NiCoSe /N-rGO-20 as an anode, N-rGO as cathode by using 2 mol l KOH as an electrolyte. NiCoSe /N-rGO-20//N-rGO ASC demonstrates an ultra-big energy density of 14 Wh kg and good circulation stability in the power density of 902 W kg . It is doubled in comparison to the NiCoSe /N-rGO-20//rGO asymmetric supercapacitor (7 Wh kg ). The NiCoSe /N-rGO-20//N-rGO ASC capacity retention is still up to 93% over 5000 cycles (5 A g ). The results reveal that this device would be a prospective cathode material of supercapacitors in actual applications.