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2018 | "Capacitance changes associated with cation-transport in free-standing…

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작성자 관리자 /   작성일2020-01-28 /   조회463회

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-Title: Capacitance changes associated with cation-transport in free-standing flexible Ti3C2Tx (T = O, F, OH) MXene film electrodes
-Authors: Aniu Qian, Seo Eun Hyeon, Jung Yong Seo and Chan-Hwa Chung

-Journal: Electrochimica Acta (2018)
-Vol./No./Page: 266/10/86-93
-DOI: https://doi.org/10.1016/j.electacta.2018.02.019


Abstract : Free-standing Ti3C2Tx MXene films with flexible feature are considered to be promising electrodes for the application in flexible energy devices. Exploring the different cation effect and each transport mechanism will help us to identify the optimized cation for special applications. Herein, we investigate the relationship between cation transports and capacitance behavior under different potential windows. In addition, we uncover  intercalation mechanisms for Liþ, Naþ, and Kþ-containing electrolytes. As a result, we found that capacitive intercalation mechanism of characteristic cation can be influenced by different potential windows. Importantly, after 5000 charge-discharge cycles from 1 V to 0 V, the cationintercalation behavior is demonstrated by significant electrode expansion in LiCl, NaCl, and KCl electrolytes with the increased d-spacing of 1.344 nm, 1.313 nm, and 1.305 nm, respectively. Additionally, larger size of Kþ with fast ion transport is involved in fast electrochemical surface adsorptions, which explains higher capacitance of 346 F cm3 in KCl than 218 F cm3 in NaCl electrolyte. In contrast, small ion size of Liþ is vulnerable to adsorb and permeate the spacing between layers of Ti3C2Tx MXene electrode, which delivers volumetric capacitance of 320 F cm3. The present study provides direct experimental evidence for electrochemical mechanism of cation intercalation between Ti3C2Tx MXene layer sheets.

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