A flower‐like α‐phase nickel‐cobalt‐manganese hydroxide modified with two‐dimensional Ti3C2 for high performance hybrid supercapacitors

Abstract

Abstract A flower‐like nickel‐cobalt‐manganese hydroxide (NiCoMn‐OH) modified with two‐dimensional Ti3C2 nanoflakes has been synthesized via simple one‐step hydrothermal method. The NiCoMn‐OH/Ti3C2 composite exhibits a high specific capacity of 670.3 C/g at a specific current of 1 A/g, higher than 614.6 C/g for NiCoMn‐OH and 8.9 C/g for Ti3C2 at the same conditions. The improved electrochemical performance is due to that Ti3C2 is absorbed and distributed on the surface of NiCoMn‐OH in its situ synthesis process and enhances its electro‐activity. The hybrid supercapacitor based on NiCoMn‐OH/Ti3C2 and RGO shows high specific capacity of 177.5 C/g at 0.5 A/g and 103.1 C/g at 10 A/g, retaining 93.28% of initial capacity after 5000 charge/discharge cycles at 7 A/g. The hybrid supercapacitor also displays extraordinary specific energy of 41.15 Wh/kg at a specific power of 375 W/kg and 21.46 Wh/kg even at 7.5 kW/kg.

Keywords

• 2D Ti3C2
• Electrochemical performance
• Hybrid Supercapacitor
• NiCoMn‐OH