Effect of 6‐thioguanine, as an electrolyte additive, on the electrochemical behavior of an Al–air battery. Issue 9 (18th March 2020)

• Record Type: Journal Article
• Authors: Hou, Changsheng; Chen, Shixing; Wang, Zuokai; Wang, Guixiang; Dong, Guojun
• Is Part Of: Materials and corrosion. Volume 71:Issue 9(2020)
• Page Start: 1480
• Page End: 1487
• Publication Date: 2020-03-18
• Subjects: 6‐thioguanine -- Al electrodes -- corrosion resistance; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.202011542
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract: In this study, the electrochemical behavior of an Al–air battery is improved by mixing 6‐thioguanine into 4.0 M NaOH electrolyte. The electrochemical performance of the Al electrodes is analyzed using potentiodynamic polarization, potentiostatic oxidation, and electrochemical impedance spectroscopy. The surface morphology of the Al electrodes after discharging for 1, 000 s is characterized using scanning electron microscopy coupled with X‐ray elemental mapping for Al, O, C, N, and S. Furthermore, the utilization efficiencies of these samples are also determined. The results show that the corrosion resistance of the Al electrodes initially increases and then decreases with an increase in 6‐thioguanine concentration. The presence of 6‐thioguanine enhances the corrosion resistance to the maximum, with a corrosion current density ( I corr ) of 6.170 mA/cm 2, and corrosion inhibition efficiency ( η ) of 36.56%, at 0.5 mM of 6‐thioguanine. Abstract : In an Al–air battery, 6‐thioguanine forms protective films on Al surfaces in 4.0 M NaOH electrolyte, which improve the corrosion resistance of the Al electrodes. The optimal concentration of 6‐thioguanine is 0.5 mM for improving the electrochemical performance with the corrosion current density, corrosion inhibition efficiency, and utilization efficiency of the Al electrode being 6.170 mA/cm 2, 36.56%, and 74.6%, respectively.