SnO2 nanocubes/bentonite modified SPEEK nanocomposite composite membrane for high performance and durable direct methanol fuel cells

• Main Authors: Ranjani, M., Al-Sehemi, Abdullah G., Pannipara, Mehboobali, Aziz, Md. Abdul, Phang, Siew Moi, Ng, Fong Lee, kumar, G. Gnana
• Format: Article
• Published: Elsevier 2020
• Subjects: Q Science (General); QD Chemistry
• Online Access: http://eprints.um.edu.my/25330/; https://doi.org/10.1016/j.ssi.2020.115318

Tin oxide nanocubes/sulfonated bentonite (SnO2/sBH) nanocomposite blended with acidified poly ether ether ketone (SPEEK) solid state electrolyte is developed for DMFCs. Morphological investigations reveal the existence of SnO2 nanocubes on sheet-like structure of sBH and the uniform dispersion of above composite on SPEEK matrix. The layered sheet-like structure of BH act as heat diffusion barrier and the ceramic feature of SnO2 further improves the thermal stability of a SPEEK membrane. The exposed large surface area of BH and tightly bound water molecules in SnO2 and -SO3H sites increase the water retention properties, which consequently enhance the ionic conductivity of SPEEK/sBH/SnO2 composite membrane. Furthermore, the high aspect ratio of sBH and methanol resistive characteristic of SnO2 lower the methanol diffusion channels in the sBH/SnO2 composite membrane. With the coalition of above significant electrochemical properties, SPEEK/sBH/SnO2 solid electrolyte demonstrates the high DMFC power density and excellent durability, which showers light on the viability of prepared membrane in high performance and durable DMFCs. © 2020 Elsevier B.V.