Molecularly Stacking Manganese Dioxide/Titanium Carbide Sheets to Produce Highly Flexible and Conductive Film Electrodes with Improved Pseudocapacitive Performances

4 years ago

Molecularly Stacking Manganese Dioxide/Titanium Carbide Sheets to Produce Highly Flexible and Conductive Film Electrodes with Improved Pseudocapacitive Performances

Qingwen Li, Weihong Liu, Yanli Su, Zhiqiang Wang, Zhigang Zhao, Fengxia Geng

2D nanostructures with high surface area and flexibility are regarded as a promising building platform for flexible supercapacitors that are attracting tremendous attention due to their potential applications in various wearable technologies. Notably, although pseudocapacitive metal oxides are widely accepted as a very important class of electrochemically active materials, the utilization of 2D metal oxide sheets in the preparation of flexible supercapacitors is very rare. The scarcity of a suitable filler with the integrated properties of both high conductivity and excellent hydrophilicity is probably to blame. In this work, by introducing a recently discovered intriguing material, Ti3C2 sheets, a novel MnO2/Ti3C2 hybrid with a molecularly stacked structure is developed using a simple and scalable mixing and filtration method. Their individual advantages are combined in the hybrid, thus delivering excellent electrochemical performances. A highly flexible and symmetric supercapacitor based on the novel hybrid electrode manifests top-class electrochemical performance with maximum energy and power densities of 8.3 W h kg−1 (at 221.33 W kg−1) and 2376 W kg−1 (at 3.3 W h kg−1), respectively, regardless of the various bending states, suggesting enormous possibilities for applications in future flexible and portable micropower systems. A manganese dioxide/titanium carbide hybrid film with two kinds of sheets molecularly stacked is successfully prepared by a simple and scalable vacuum filtration method. Such molecular hybridization integrates the best properties of the two ingredients and enables delivery of excellent electrochemical performances and also high mechanical flexibility.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201602834