In-situ Detection of Hydrogen Gas Evolved from Dissolving Mg by Gas-Chromatographic Analysis

Abstract

The higher rates of hydrogen evolution are observed on Mg and its alloys surface when they are polarized anodically in the electrolyte solution. To clarify this phenomenon, which has been termed “anomalous HE” in recent years1, various real-time hydrogen gas analysis methods have been developed2-10. Our group5,10 have developed an in-situ hydrogen gas detection system during electrochemical measurement of Mg. This system is composed of an electrochemical cell and a gas chromatograph. When the hydrogen gas evolved from dissolving Mg surface during electrochemical measurement, the gases are delivered to the gas chromatograph with the argon carrier gas. Thus, it allows for the qualitative and quantitative analyses of gases evolved from dissolving Mg surface.In the present study, we applied the developed system to in-situ detection of hydrogen gas from magnesium surface under potentiostatic polarization and during anodic polarization curve measurement5,10. The hydrogen evolution rate could be determined successively by calculating from the volume of hydrogen gas estimated by gas-chromatographic analysis at arbitrary time under potentiostatic polarization. In the case of anodic polarization curve measurement of Mg, the cathodic current attributed to the hydrogen evolution reaction could be estimated from the volume of hydrogen gas obtained by gas-chromatographic analysis at arbitrary polarization potential. It indicated that the partial anodic current at each polarization potential could be estimated by the sum of the measured anodic current and absolute value of cathodic current related to the hydrogen evolution reaction by the developed system. On the basis of these results, the measured anodic polarization curve of Mg and partial anodic polarization curve, which could be obtained by the plots of partial anodic current at each polarization potential, are correlated discussed.References M. Esmaily, J. E. Svensson, S. Fajardo, N. Birbilis, G. S. Frankel, S. Virtanen, R. Arrabal, S. Thomas, and L. G. Johansson, Prog. Mater. Sci., 89, 92 (2017).M. Curioni, Electrochim. Acta, 120, 284 (2014).S. Lebouil, A. Duboin, F. Monti, P. Tabeling, P. Volovitch, and K. Ogle, Electrochim. Acta, 124, 176 (2014).S. Fajardo and G. S. Frankel, J. Electrochem. Soc., 162, C693 (2015).Y. Hoshi, R. Takemiya, I. Shitanda, and M. Itagaki, J. Electrochem. Soc., 163, C303 (2016).Y. Hoshi, K. Miyazawa, I. Shitanda, and M. Itagaki, J. Electrochem. Soc., 165, C243 (2018).M. Strebl and S. Virtanen, J. Electrochem. Soc., 166, C3001 (2019).M. Strebl, M. Bruns, and S. Virtanen, J. Electrochem. Soc., 167, 021510 (2020).M. G. Strebl, M. P. Bruns, G. Schulze, and S. Virtanen, J. Electrochem. Soc., 168, 011502 (2021).Y. Hoshi, Y. Hirayama, I. Shitanda, and M. Itagaki, J. Electrochem. Soc., 168, 031510 (2021).