Preparation of CeO2 based nanocomposites for fuel cell electrolyte via sol‐gel method

摘要

A Ce0·8Sm0·2O1·9 nanocomposite with potential for application as a fuel cell electrolyte was prepared via the sol?gel method. Nitrates and citric acid were respectively adopted as reactor and complexing agent to synthesise the composite. X-ray diffraction was used to investigate the influence of temperature and content of nitric acid on the purity and grain size of the CeO2 phase. It was found that nanocrystals with 20 nm grain size can be obtained following heating for 4 h at 800°C and that addition of nitric acid improved the purity of the phase produced. A microscale model of the structural transformation from precursor gel to powder for the composite is proposed.