This work was supported by the National Natural Science Foundation of China (Grant Nos. 41272053 and 41472041). C.W. acknowledges a postdoctoral science foundation of China (2015M582301), Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan), and National Natural Science Youth Foundation of China (Grant No. 41602037). The authors wish to thank Dr. Yu J. S. for XRD analysis, Dr. Liu X. W, for HRTEM analysis and Dr. Yang H. and Dr. Yang Q. for SEM analysis.
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