The loading of polyoxometalates compound on a biomass derived N-doped mesoporous carbon matrix, a composite material for electrical energy storage

Abstract

A polyoxometalate (POM)-based composite material (NiPW₁₂NP/NMC) was synthesized, in which the nanoparticle of a POM compound (NiPW₁₂NP) distributes on orange juice derived nitrogen doped mesoporous carbon matrix (NMC) homogenously. When employed as a cathode material, NiPW₁₂NP/NMC exhibits high specific capacitance, remarkable rate capability and long-term stability. When the current density is 4 A·g⁻¹, a specific capacitance as high as 547 F·g⁻¹ is achieved by NiPW₁₂NP/NMC. With NiPW₁₂NP/NMC serving as cathode and MnO₂ acting as anode, a high performance asymmetric supercapacitor is assembled, which possesses a high energy density of 10.88 Wh·kg⁻¹ at 0.64 kW·kg⁻¹. It also shows a good rate capability, when the current density increases from 4 to 12 A·g⁻¹, its specific capacitance decreases from 113 to 88 F·g⁻¹, with 77.9% capacitance retention. After 5000 cycles charge-discharge experiments, 92.8% of its capacitance can be maintained, which exhibits good stability.

Keywords:

• Polyoxometalates
• biomass
• N-doped mesoporous carbon
• asymmetric supercapacitor

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation (21303010).