S-1 Supporting information Twodimensional titanium carbide MXene as a cathode material for hybrid magnesium/lithiumion batteries ! " # $ %"# &#’# # " ( ) * + , a Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, United States b Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehakro, Yuseonggu, Daejeon 305701, Republic of Korea c Thin Film Physcis Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE58183, Linköping, Sweden *To whom correspondence should be addressed: gogotsi@drexel.edu, Tel.: +12158956446