Corrosion Resistance of the CpTi G2 Cellular Lattice with TPMS Architecture for Gas Diffusion Electrodes.

Bożena Łosiewicz,Joanna Maszybrocka,Andrzej Stwora,Grzegorz Skrabalak,Julian Kubisztal

doi:10.3390/ma14010081

Bożena Łosiewicz, Joanna Maszybrocka + Show 3 more

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https://doi.org/10.3390/ma14010081

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Abstract

The corrosion of materials used in the design of metal-air batteries may shorten their cycle life. Therefore, metal-based materials with enhanced electrochemical stability have attracted much attention. The purpose of this work was to determine the corrosion resistance of commercially pure titanium Grade 2 (CpTi G2) cellular lattice with the triply periodic minimal surfaces (TPMS) architecture of G80, D80, I-2Y80 in 0.1 M KOH solution saturated with oxygen at 25 °C. To produce CpTi G2 cellular lattices, selective laser melting technology was used which allowed us to obtain 3D cellular lattice structures with a controlled total porosity of 80%. For comparison, the bulk electrode was also investigated. SEM examination and statistical analysis of the surface topography maps of the CpTi G2 cellular lattices with the TPMS architecture revealed much more complex surface morphology compared to the bulk CpTi SLM. Corrosion resistance tests of the obtained materials were conducted using open circuit potential method, Tafel curves, anodic polarization curves, and electrochemical impedance spectroscopy. The highest corrosion resistance and the lowest material consumption per year were revealed for the CpTi G2 cellular lattice with TPMS architecture of G80, which can be proposed as promising material with increased corrosion resistance for gas diffusion in alkaline metal-air batteries.

Highlights

IntroductionMetal-air batteries (MABs) are of great interest due to their high theoretical energy density and because they can be used in stationary, mobile, and electronic applications [1,2,3,4,5,6,7]
Received: 4 November 2020 Accepted: 22 December 2020 Published: 26 December 2020Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.Metal-air batteries (MABs) are of great interest due to their high theoretical energy density and because they can be used in stationary, mobile, and electronic applications [1,2,3,4,5,6,7]
SEM examination and statistical analysis of the surface topography maps of the commercially pure titanium Grade 2 (CpTi G2) cellular lattices with the triply periodic minimal surfaces (TPMS) architecture revealed much more complex surface morphology compared to the bulk CpTi select laser melting (SLM)

Summary

Introduction

Metal-air batteries (MABs) are of great interest due to their high theoretical energy density and because they can be used in stationary, mobile, and electronic applications [1,2,3,4,5,6,7]. Aqueous MBAs include Fe-air, Zn-air, Mg-air, and Al-air batteries In this group, the most promising for industrial scale applications are Zn-air and Al-air batteries with water-stable metal electrodes [5,6,8,9,10]. The Coulombic efficiency of the MABs is still too low for applications in electric vehicles and electronic devices. To overcome this problem, the optimizations of electrodes, electrolytes, and separator materials are necessary. Further efforts need to be made to increase the efficiency of both reduction and evolution reactions of oxygen, which require the development of long-term and effective bifunctional electrocatalysts in aqueous electrolytes

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