Two-dimensional (2D) nanomaterials, such as graphene and transition metal dichalcogenides, are currently a topic of great interest. MXene nanosheets, a newly synthesized 2D early transition metal cabides, have been intensively investigated due to their promising applications in lithium-ion batteries and electrical double layer capacitors. Here, we present a systematically study of metal ion (Na+, K+, Mg2+, Ca2+, and Al3+) storage on MXene nanosheets by combing theoretical simulations and experimental measurements. We find that both O-terminated and bare MXenes are promising anode materials with high capacities and good rate capabilities, while bare MXenes show better performance. Our experiments clearly demonstrate the feasibility of Na- and K-ion intercalation into terminated MXenes. Moreover, Mg- and Al-ion show a stunning multilayer adsorption on MXenes, which significantly increases their theoretical capacities. We also predict that O-terminated MXenes can decompose into bare MXenes and metal oxides when in contact with Mg-, Ca-, or Al-ion. Our results provide insight into metal ion storage mechanisms on two-dimensional materials and suggest a route to preparing bare MXene nanosheets.

MXene nanosheets as promising anode materials for nonlithium-ion batteries

249th National Meeting (2015)

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