Role of Al(III) in Zn-Based Electrode Synthesis for Supercapacitor

Yubin Yang,Yue Yu,Hongfeng Xu,Shaomin Zhu

doi:10.4236/msa.2020.1110044

Abstract

Supercapacitor is considered as one of the most promising energy storage systems because of its high power density, long life and low production cost. Electrode materials play important roles in the performance of Supercapacitor (SC). In this study, Zn-based hydrotalcite structure materials are prepared by hydrothermal method. The influence of Zn/Al ratio in precursors on electrochemical properties of electrode materials is investigated. The results show that Al(III) promotes the formation of relatively ordered active substances and participates in redox reaction on electrode surface. Specific capacitance of Zn-based electrode reaches 2557 F·g-1 (1.0 A·g-1) at Zn/Al molar ratio of 1:1 in precursors. This method is simple and environmentally friendly. The electrode exhibits excellent electrochemical activity and stability, showing this material application prospect for supercapacitor.

Highlights

The continuous progress of our society asks for green and sustainable development of economy, and puts forward higher requirements for energy storage and conversion [1]
The results show that Al(III) promotes the formation of relatively ordered active substances and participates in redox reaction on electrode surface
Zn-based electrode materials are prepared by hydrothermal method as literature [6] [7]

Summary

Introduction

The continuous progress of our society asks for green and sustainable development of economy, and puts forward higher requirements for energy storage and conversion [1]. A few atoms thickness of LDHs nanosheet makes this material have relatively high specific surface area, and can fully expose electrochemical active sites. Zn-based electrode materials were prepared which had mainly Zn4(OH)6CO3·H2O crystal structure and showed excellent electrochemical activity [7]. The role of Al(III) is not clear both in synthesis process and in electrochemical reaction Whether can this layered active material still be obtained without Al(III)? In order to answer these questions, the materials with different Al(III) amount in precursors are prepared and their electrochemical activity, stability, composition and structure are analyzed

Preparation of Electrode

Characterization

Results and Discussion

Conclusion