[IEEE 2011 2nd International Conference on Instrumentation, Communications, Information Technology, and Biomedical Engineering (ICICI-BME) - Bandung, West Java, Indonesia (2011.11.8-2011.11.9)] 2011 2nd International Conference on Instrumentation, Communications, Information Technology, and Biomedical Engineering - Synthesis and characterization of Gd and Er co-doped ceria as solid electrolyte for IT-SOFC via solid state method