Patents

The invention provides a process for the preparation of sol-gel modified alternative Nafion-Silica composite membrane useful for polymer electrolyte fuel cell. The said composite membrane is made by embedding silica particles in perfluorosulfonic acid ionomer by a process that circumvents the use of added acid while using acidic characteristics of Nafion and polymerization reaction through a sol-gel route. The composite membrane has high affinity for water with capability to exchange protons. The approach may be used to manufacture polymer electrolyte membrane fuel cells operating at elevated temperatures under near-zero humidity.