Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

By Xianfen Wang, Satoshi Kajiyama, H. Iinuma, E. Hosono, Shinji Oro, I. Moriguchi, M. Okubo, Atsuo Yamada. Nature Communications, 2015

1,013 citations recorded by the source corpus.

High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4 V and delivers 90 and 40 mAh g−1 at 1.0 and 5.0 A g−1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems. Conventional sodium ion batteries have low energy and power densities. Here, the authors report the use of MXene Ti2C as a negative electrode for sodium ion energy storage, and show that the pseudocapacitance of the electrode allows the hybrid capacitors to achieve high electrochemical performance.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/9fd0c8bc45edba8d1f2336fade0c6d57d7ed4b94

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Citations in the corpus

The world of two-dimensional carbides and nitrides (MXenes) (2021, background): “The electrochemical intercalation of cations with different sizes and charges from both aqueous and nonaqueous electrolytes has been observed for a variety of MXenes (4, 6, 7, 50, 111, 112).”