Siriwan Chokkha

Suranaree University of Technology, Thailand

Conductive Material from Automotive Industrial Waste

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Biography

I was born in Nakhon Ratchasima, Thailand, in 1987. I received the B.Eng, M.Eng and Ph.D. degrees in ceramic Engineering from Suranaree University of Technology, Thailand, in 2008, 2011 and 2015 respectively. I am currently engaged as an Assist professor in the school of Ceramic engineering, Institute of Engineering, Suranaree University of Technology. Nevertheless, I am a member of the Center of Excellence in Biomechanics Medicine. My research interests include all traditional and advanced ceramics, bio-material, Electronic and Energy material, Zero waste and sustainability and medical device

Abstract

Automotive industrial waste is increasing rapidly to meet the demand for using an automobile, resulting in subsequent environmental problems because the waste will be disposed by landfill. To solve sustainable environmental problems, strong acid of HNO₃ is utilized to transform the chemical composition of iron-rich automotive manufacturing waste. The final outcome of the chemical interaction between Fe-waste and HNO₃ strong acid is a pure form of Fe₂O₃ that is insoluble in water. Then, a conductive perovskite material with the chemical formula of LaNi_0.6Fe_0.4O₃₊₅ is used mechanical grinding synthesized technique by substituting Fe₂O₃-waste in Ni-metal site (B-site). The mixed phases of LaNi_0.6Fe_0.4O₃₊₅, LaNi_0.75Fe_0.25O₃₊₅ and LaNiO₃₊₅ from automotive industrial waste after sintering at 1200^oC for 2 hrs is detected by XRD with using TOPAS software analysis in the amount of 53.13%, 29.41% and 17.46%, respectively. The LaNi_0.6Fe_0.4O_3+d calculated perovskite material from automotive industrial waste is presented the highest electrical conductivity with a value of 42 S/cm at 550^oC. Additionally, the electrical conducting property is mixed of metallic and semiconducting behavior with a transition point of electrical conductivity at 550^oC. Moreover, the coefficient of thermal expansion of LaNi_0.6Fe_0.4O_3+d synthesized sample from automotive industrial waste is represented in the range of 12-13 1/^oC, which is similar to the electrolyte materials used in an Intermediate temperature solid oxide fuel cell (IT-SOFC) components. The results suggested that the strong acid could change the chemical composition of automotive industrial waste, which could then be utilized as a starting material for synthesis of IT-SOFC conductive materials. The experiment can reduce the amount of waste, offer additional value of industrial waste, as well as provide a long-term sustainable solution to environmental problems.