Carbon Encapsulated and rGO Wrapped Mo₂C: an Anode Material with Enhanced Sodium Storage Capacity

Abstract

In this work, composite of Mo 2 C embedded in carbon and decorated on reduced graphene oxide (rGO) was synthesised by simple and inexpensive method followed by reductioncarbonisation for anode material for sodium ion battery. A series of techniques were utilized for structural, morphological and electrochemical characterizations. The electrochemical behaviour of Mo 2 C composites as anode materials of sodium ion battery was explored thoroughly. Mo 2 C embedded in carbon and decorated on rGO nanosheets (Mo 2 C/C/rGO) showed enhanced electrochemical performance in all respects. This unique design of Mo 2 C/C/rGO exhibited specific capacity of 498 mAh g À 1 at 50 mA g À 1 current density and it retained 96.4 % of its initial capacity after 750 cycles. The added carbon and rGO nanosheets not only enhanced electronic conductivity but also minimized the adverse effect arises due to volume expansion during charging and discharging. The full cell fabricated with this rationally designed anode against NaNi 0.5 Mn 0.3 Co 0.2 O 2 cathode delivered specific capacity of approximately 107 mAh g À 1 at 50 mA g À 1 . Theoretical studies disclose that strong interaction between Mo 2 C and graphene modifies the band structure and geometrical parameters which facilitates sodium ion movement in the composite. These results shed light on Mo 2 C/C/rGO as future potential anode material for sodium ion battery application.

Synchronous embedded growth of Mo2C nanodisk arrays immobilized on porous carbon nanosheets for ultra-stable sodium storage

“…4d). 19,24,28,49–51 In addition, the discharge specific capacity could still reach 227.1 mA h g −1 when the current density returned to 0.1 A g −1 . In contrast, Mo 2 C and Mo 2 C/C-3 could only exhibit capacities of 51.4/6.5 mA h g −1 and 92.9/9.6 mA h g −1 at 0.1/5 A g −1 , and even when the current density was restored to 0.1 A g −1 , their discharge capacities were only 43.5 and 83.4 mA h g −1 .…”

Experimental and Theoretical Indagation of Binder-Free N-Graphene Coupling Vanadium Tetrasulfide Aerogel Cathode for Promoting Aqueous Zn-Ion Storage

“…The linear dependence between Z ′ and ω –1/2 at a low-frequency area is given in Figure g. σ can be achieved by substituting the data from the figure in the equation Z ′ = σω –0.5 + R s + R ct . Accordingly, σ values of the two electrodes can be evaluated; the value is 19.0 for VS 4 @NGA and 35.8 for VS 4 .…”

A porous organic polymer for symmetric sodium dual-ion batteries through an adsorption-intercalation-insertion mechanism

“…, having redox-active moieties). 9 On the other hand, in the quest for efficient electrode materials, redox-active POPs have been found to satisfy some of the key energy storage performance metrics. 10 POPs have been used in a wide range of applications ranging from water purification, catalysis and light harvesting, to energy storage, including batteries and supercapacitors.…”