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Ultra-Stable Titanium Carbide MXene Functionalized with Heterocyclic Aromatic Amines

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Title
Ultra-Stable Titanium Carbide MXene Functionalized with Heterocyclic Aromatic Amines
Author(s)
Yun, Hwajin; Chae, Yoonjeong; Kim, Eunji; Hong Ki Kim; Jang, Sukhyeun; Mu-Hyun Baik; Ahn, Chi Won; Lee, Yonghee
Publication Date
2022-12
Journal
ADVANCED FUNCTIONAL MATERIALS, v.32, no.49
Publisher
WILEY-V C H VERLAG GMBH
Abstract
2D transition metal carbides (MXenes) obtained from bulk M(n+1)AX(n) (n = 1, 2, 3, or 4) phases are an intriguing class of crystalline solids with unique physicochemical properties for promising applications such as batteries, capacitive energy storage, and electrocatalysis. One of the obstacles that must be overcome for technical applications is that MXene flakes delaminated in aqueous conditions suffer from phase transition and/or structural decomposition over time. Herein, a simple but powerful strategy to enhance their stability by passivating vulnerable edges on the delaminated MXene (Ti3C2Tx) with heterocyclic aromatic amines is reported. In particular, pyrrole-functionalized MXenes are found to facilitate anti-oxidation in aqueous solutions at room temperature over 700 days, at 70 degrees C over 42 days, and even with a strong oxidizer (H2O2, 9.70 mmol) over 50 days. On the other hand, the as-prepared MXene solution lost its color within a month at room temperature, a day at 70 degrees C, and 5 min in the presence of H2O2 (9.70 mmol). Density functional theory calculations indicate that chemical interactions between MXene and pyrrole are extremely strong and involve the formation of Ti-C bonds. Furthermore, pyrrole-functionalized MXenes exhibit higher electrochemical performance than pristine MXenes as a supercapacitor.
URI
https://pr.ibs.re.kr/handle/8788114/12359
DOI
10.1002/adfm.202203296
ISSN
1616-301X
Appears in Collections:
Center for Catalytic Hydrocarbon Functionalizations(분자활성 촉매반응 연구단) > 1. Journal Papers (저널논문)
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