Surface Characteristic Effect of Ag/TiO2 Nanoarray Composite Structure on Supercapacitor Electrode Properties.

Jie Cui,Dahai Zeng,Zhidan Lin,Lin Cao,Wei Li,Xiaojian Wang,Peng Zhang

doi:10.1155/2018/2464981

Jie Cui, Dahai Zeng + Show 5 more

Open Access

https://doi.org/10.1155/2018/2464981

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Journal: Scanning	Publication Date: Jul 24, 2018
Citations: 7	License type: CC BY 4.0

Affiliation: South China University of Technology, Jinan University

Abstract

Ag-ion-modified titanium nanotube (Ag/TiO2-NT) arrays were designed and fabricated as the electrode material of supercapacitors for electrochemical energy storage. TiO2 nanotube (NT) arrays were prepared by electrochemical anodic oxidation and then treated by Ag metal vapor vacuum arc (MEVVA) implantation. The Ag amount was controlled via adjusting ion implantation parameters. The morphology, crystallinity, and electrochemistry properties of as-obtained Ag/TiO2-NT electrodes were distinguished based on various characterizations. Compared with different doses of Ag/TiO2-NTs, the electrode with the dose of 5.0 × 1017 ions·cm−2 exhibited much higher electrode capacity and greatly enhanced activity in comparison to the pure TiO2-NTs. The modified electrode showed a high capacitance of 9324.6 mF·cm−3 (86.9 mF·g, 1.2 mF·cm−2), energy density of 82.8 μWh·cm−3 (0.8 μWh·g, 0.0103 μWh·cm−2), and power density of 161.0 mW·cm−3 (150.4 μW·g, 2.00 μW·cm−2) at the current density of 0.05 mA. Therefore, Ag/TiO2-NTs could act as a feasible electrode material of supercapacitors.

Highlights

Nowadays, with the rapid development of science and technology, the depletion of fossil fuels urges a need for efficient, clean, and sustainable sources of energy, as well as with the demand for energy conversion and storage [1,2,3]
A net-like surface layer with uniform pores was formed after the Ag-ion implantation dose of 0.5 × 1017 ions·cm−2 (as Figures 1(c) and
An Ag-ion implantation modification Ag/TiO2NT array composite structure has been successfully synthesized via two steps: anodization and ion implantation

Summary

Introduction

With the rapid development of science and technology, the depletion of fossil fuels urges a need for efficient, clean, and sustainable sources of energy, as well as with the demand for energy conversion and storage [1,2,3]. One approach is to prepare a nanostructure with suitable pore-size distribution and pore network, which leads to high specific surface area, more active sites and high rates of ion diffusion, and a low internal electrical resistance for more efficiency at carrying electronic charges [5,6,7] It would bring a better electrochemical and mechanical stability for good cycling performance. Metal oxides can provide higher energy density for supercapacitors than conventional carbon materials and better electrochemical stability than polymer materials [15]. TiO2-NTs with vertically oriented nanotube arrays can provide a direct pathway for electron transport along the nanotube’s long axis to the substrate [26] It provides a high surface area, which shows excellent chemical stability. The morphologies, microstructures, and electrochemical performances of the Ag/TiO2-NT products were investigated

Materials and Methods

Results and Discussion

Conclusions