Facile Synthesis of MnPO4·H2O Nanowire/Graphene Oxide Composite Material and Its Application as Electrode Material for High Performance Supercapacitors

Bo Yan,Duan Bin,Caiqin Wang,Fangfang Ren,Yukou Du,Zhiping Xiong,Ke Zhang

doi:10.3390/catal6120198

Abstract

In this work, we reported a facile one-pot hydrothermal method to synthesize MnPO4·H2O nanowire/graphene oxide composite material with coated graphene oxide. Transmission electron microscopy and scanning electron microscope were employed to study its morphology information, and X-ray diffraction was used to study the phase and structure of the material. Additionally, X-ray photoelectron spectroscopy was used to study the elements information. To measure electrochemical performances of electrode materials and the symmetry cell, cyclic voltammetry, chronopotentiometry and electrochemical impedance spectrometry were conducted on electrochemical workstation using 3 M KOH electrolytes. Importantly, electrochemical results showed that the as-prepared MnPO4·H2O nanowire/graphene oxide composite material exhibited high specific capacitance (287.9 F·g−1 at 0.625 A·g−1) and specific power (1.5 × 105 W·kg−1 at 2.271 Wh·kg−1), which is expected to have promising applications as supercapacitor electrode material.

Highlights

In view of the limitations of energy storage, the application of supercapacitors (SCs) is becoming increasingly accepted
The results suggest that the MnPO4 ·H2 O material composited with graphene can be a promising candidate in applications of supercapacitors
MnPO4 ·H2 O without GO were characterized by X-ray diffraction (XRD)

Summary

Introduction

In view of the limitations of energy storage, the application of supercapacitors (SCs) is becoming increasingly accepted. SCs, with their advantages such as higher power density, longer cycle stability and more reliable safety, have generally become the key to solve energy storage problems. SCs can be divided into two categories: (1) electric double-layer capacitors (EDLCs) and (2) pseudocapacitors ( called redox supercapacitors). The former stores energy through charge separation at the interface between the active material and electrolytes [1,2,3]. Theoretical specific capacitance of graphene reaches 550 F·g−1 [4,5,6,7]

Methods

Results

Conclusion