Abstract
The recycling of exhausted lithium-ion batteries from mobile phones originate five solutions with different Co and Mn proportions that were used as electrolytic solutions to obtain Mn-Co spinel coatings on the surface of AISI430 stainless steel. The coatings are intended to contain chromium volatility in the working conditions of Solid Oxide Fuel Cells (SOFC) metallic interconnectors. Potentiostatic electrodeposition was the technique used to obtain Mn-Co coatings from low concentration electrolytes at pH = 3.0 and potential applied −1.3 V. Charge efficiency data were used for sample optimization. Three optimized samples were subjected to oxidation heat treatment at 800 °C for 300 h and then characterized by XRD, SEM and EDS. The results showed that the addition of manganese ions instead of cobalt ions in the electrolytic bath produces more stable and well-distributed deposits as the ratio of the two ions becomes equal in the electrolytic bath. Thin, homogeneous and stable spinel coatings (Mn, Co)3O4 2.8 μm and 3.9 μm thick were able to block chromium volatility when exposed to SOFC operating temperature.
Highlights
Solid Oxide Fuel Cells (SOFC’s) are promising devices for power generation [1,2,3,4,5]
Operating in medium-high temperature environments (750–1000 ◦C), SOFCs have relatively high energy conversion efficiency, low emission of pollutants and fuel flexibility compared to other types of fuel cells [1,2,3,4,5,6]
The electrical contact between two adjacent SOFC unit cells is promoted by the interconnectors, which have the function of separating and distributing fuel and oxidant gases in the electrode [7,8,9]
Summary
Solid Oxide Fuel Cells (SOFC’s) are promising devices for power generation [1,2,3,4,5]. In our previous work [41], the same recycling process was used to obtain a new anode for hydrogen production that was developed based on 430 stainless steel In this present work, the mobile phones cathodes were dissolved under a hydrometallurgical process and produced a solution rich in Co and another in Mn. In this present work, the mobile phones cathodes were dissolved under a hydrometallurgical process and produced a solution rich in Co and another in Mn These solutions were used for the electrodeposition of Mn-Co in AISI 430 ferritic stainless steel by electrolytes with different Co and Mn proportions to improve its morphological and efficiency characteristics as a SOFC metallic interconnector. SEM and EDS were used to verify the homogeneity, grain distribution and surface chemical composition
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