Co3O4@NiMoO4 composite electrode materials for flexible hybrid capacitors

Abstract

Co3O4 nanomaterials as electrodes have been studied widely in the past decade due to their unique structural characteristics. However, their performance does not yet reach the level required for practical applications. It is, nevertheless, an effective strategy to synthesize hybrid electrode materials with high energy density. Herein we prepare Co3O4@NiMoO4 nanowires by a two-step hydrothermal method. The as-obtained sample can be directly used as cathode material of supercapacitors; with specific capacitance of 600 C/g at 1 A/g. An assembled capacitor delivers an energy density of 36.1 Wh/kg at 2700 W/kg, and retains 98.2% of the initial capacity after 8000 cycles. Graphical Abstract

Potassium ion pre-intercalated MnO2 for aqueous multivalent ion batteries

“…This problem has stimulated the investigation of promising alternatives. Due to the merits of low cost, low installation requirements, and high-level safety, aqueous rechargeable batteries (ARBs) offer an ideal option for dealing with future energy-demand pressure [ 6 – 9 ]. While relatively low energy density is one of the main issues of ARBSs [ 10 – 12 ], pairing multivalent ion carriers and exploiting high capacity cathode materials provide effective strategies to conquer the problem [ 13 – 16 ].…”