1. Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsNew Energy InstituteSchool of Environment and EnergySouth China University of Technology Guangzhou 510006 P. R. China
2. School of Materials Science and EngineeringGeorgia Institute of Technology Atlanta GA 30332‐0245 USA
3. The Education Ministry Key Lab of Resource Chemistry and Shanghai Key Laboratory of Rare Earth Functional MaterialsShanghai Normal University Shanghai 200234 P. R. China