Enhancing antioxidant properties of hydrogen storage alloys using PMMA coating. (5th February 2023)

• Record Type: Journal Article
• Authors: Li, Ke; Huang, Tongwen; Gao, Yunhe; Zhou, Chengshang
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 11(2023)
• Page Start: 4339
• Page End: 4348
• Publication Date: 2023-02-05
• Subjects: Hydrogen storage alloy -- Antioxidant properties -- PMMA Coating; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.10.208
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Oxidation of hydrogen storage alloy leads to the formation of a passive surface oxide layer, which deteriorates its performance. This study introduces a method utilizing polymethyl methacrylate (PMMA) nano-coating to improve the antioxidant properties of hydrogen storage alloys, including LaNi5, TiMn2, and Mg2 Ni. PMMA nano-coating was achieved using a solution immersion method. The results show that the PMMA-coating promotes a stable capacity, kinetics, and thermodynamic properties compared to those of uncoated alloys. After 168 h of air exposure, the hydrogen storage capacities of PMMA-coated LaNi5, TiMn2, and Mg2 Ni alloys show minor decreases. Moreover, cycling tests demonstrate that PMMA-coated LaNi5 and PMMA-coated Mg2 Ni have good cyclic stabilities. Our results show that the PMMA coating provides effective protection for variant hydrogen storage alloys from oxygen contamination and oxidation. Highlights: PMMA-coated LaNi5, TiMn2, and Mg2 Ni were successfully prepared by a solution immersion method. The antioxidant properties of LaNi5, TiMn2, and Mg2 Ni were enhanced due to PMMA coating. PMMA-coated alloys showed good performance retention after 168-hr air exposure.