Engineered CuO@TiO₂ Core–Shell on rGO as Anode for High‐Performance Lithium‐ and Sodium‐Ion Batteries

In the present investigation heterostructure CuO@TiO 2 and its hybrid engineered system created by an addition of reduced graphene oxide (rGO) that is, CuO@TiO 2 /rGO have been examined as anode in Li/Na‐ion battery application. The electrochemical performance of as‐fabricated mesoporous CuO@TiO 2 /rGO, CuO@TiO 2 , pristine CuO, and pristine TiO 2 have been explored as anode for Li/Na‐ion batteries. After 200 cycles, the discharging capacities of CuO@TiO 2 /rGO anode is found to be 653 mAhg −1 while CuO@TiO 2 , pristine CuO and pristine TiO 2 have shown a lithium storage capacity of 343, 184, and 99 mAhg −1 respectively at high current density (200 mAg −1 ). On the other side, as‐fabricated mesoporous CuO@TiO 2 /rGO and CuO@TiO 2 have been also checked as anode in sodium ion batteries. After 100 cycles, CuO@TiO 2 /rGO and CuO@TiO 2 have shown a sodium storage capacity of 240 and 144 mAhg −1 respectively at 200 mAg −1 which clearly shows that out of the studies materials, CuO@TiO 2 /rGO is optimum in terms of electrochemical performance in both storage system. The tentative mechanism for the enhanced electrochemical behavior CuO@TiO 2 /rGO has been discussed and described based upon X‐ray diffraction, electron microscopy and X‐ray photoelectron spectroscopy (XPS). To our best understanding, this is the first report of engineered CuO@TiO 2 /rGO anode with high Li/Na‐ion storage capacity.