Acknowledgements

Authors acknowledge the Instituto Politécnico Nacional from Mexico, for financial support through 1855 SIP multidisciplinary and 20170229 SIP projects. The authors wish to thank the National Energy Conversion and Storage Laboratory, CICATA U. Legaria of the Instituto Politécnico Nacional of Mexico, and the PhD student René Cabrera for helping with the acquisition and analysis of XRD data. The authors thank also the PhD student Guadalupe Romero Ortiz for helping in the acquisition of hydrogen adsorption data.
