Herein, a modified in situ sol-gel method was applied to prepare the Nafion/silica composite membrane with targeted filling of silica into ionic clusters. The low humidity (20-60% RH) proton conductivity of Nafion was therefore doubled at elevated temperatures (110-120 °C), and the high-temperature fuel cell performance was significantly improved by 45%.

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http://dx.doi.org/10.1039/c9cc01221dDOI Listing

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