Effect of Indole-2-carboxylic Acid on the Self-Corrosion and Discharge Activity of Aluminum Alloy Anode in Alkaline Al–Air Battery

Author:

Guo Lei1ORCID,Huang Yue2,Ritacca Alessandra Gilda3,Wang Kai1,Ritacco Ida4ORCID,Tan Yan1,Qiang Yujie56ORCID,Al-Zaqri Nabil7ORCID,Shi Wei2ORCID,Zheng Xingwen8

Affiliation:

1. School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China

2. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China

3. Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Ancona, Italy

4. Department of Chemistry, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy

5. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China

6. Binzhou Institute of Technology, Binzhou 256606, China

7. Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia

8. Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China

Abstract

Al–air battery has been regarded as a promising new energy source. However, the self-corrosion of aluminum anode leads to a loss of battery capacity and a decrease in battery longevity, limiting its commercial applications. Herein, indole-2-carboxylic acid (ICA) has been added to 4 M NaOH as a corrosion inhibitor. Its impact on the self-corrosion of aluminum alloy and the enhancement of the functionality of Al–air batteries at various concentrations have been investigated. X-ray photoelectron spectroscopy (XPS), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM) techniques have been used to examine the compositional and morphological alterations of aluminum alloy surfaces. Electrochemical and hydrogen evolution tests showed that indole-2-carboxylic acid is an efficient corrosion inhibitor in alkaline solutions, and its impact grows with concentration. Our findings demonstrated that when the inhibitor concentration is 0.07 M, the inhibition efficiency is 54.0%, the anode utilization rises from 40.2% to 79.9%, the capacity density increases from 1197.6 to 2380.9 mAh g−1, and the energy density increases from 1469.9 to 2951.8 Wh kg−1. In addition, theoretical calculations have been performed to support the experimental results.

Funder

King Saud University

National Natural Science Foundation of China

Ministry of Education industry-school cooperative education project

Foundation of the Department of Science and Technology of the Guizhou Province

Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province

Foundation of the Department of Education of the Guizhou Province

Cultivation Project of Tongren University

Publisher

MDPI AG

Subject

Chemistry (miscellaneous),Analytical Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Molecular Medicine,Drug Discovery,Pharmaceutical Science

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