Abstract
By reacting TiCl4 with nitrilo tris(methylenphosphonic acid) (NTMPA) in water solution, a titanium complex gel (Ti-NTMPA) has been prepared. After drying, this gel was powdered and mixed with benzimidazole. The resulting hybrid material, which is insoluble in water and thermally stable up to at least 210 °C, possesses proton conductivity on the order of 10–2 Ω–1 cm–1 in fully anhydrous conditions. Due to these characteristics, such Ti-NTMPA/benzimidazole hybrid may be considered for application as a proton conductor in fuel cells or water electrolyzers operating under elevated-temperature and low-humidity conditions. X-ray diffraction, thermogravimetric analysis, and FT-IR spectroscopy show the presence of hydrogen-bonding interaction between Ti-NTMPA and benzimidazole in the hybrid. It appears that the Ti-NTMPA/benzimidazole system forms a solid protic ionic with the “free” (not coordinated to Ti) phosphonic acid moieties and benzimidazole acting, respectively, as Bronsted acid and base. In this way the...
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