首页|Understanding the oxidation chemistry of Ti3C2Tx(MXene)sheets and their catalytic performances

Understanding the oxidation chemistry of Ti3C2Tx(MXene)sheets and their catalytic performances

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Transition metal carbides and nitrides(MXenes)nanosheets are attractive two-dimensional(2D)mate-rials,but they suffer from oxidation/degradation issues during storage and/or applications due to their sensitivity to water and oxygen.Despite the great research progress,the exact oxidation kinetics of Ti3C2Tx(MXene)and their final products after oxidation are not fully understood.Herein,we systemat-ically tracked the oxidation process of few-layer Ti3C2Tx nanosheets in an aqueous solution at room tem-perature over several weeks.We also studied the oxidation effects on the electrocatalytic properties of Ti3C2Tx for hydrogen evolution reaction and found that the overpotential to achieve a current density of 10 mA cm-2 increases from 0.435 to 0.877 V after three weeks of degradation,followed by improve-ment to stabilized values of around 0.40 V after eight weeks.These results suggest that severely oxidized MXene could be a promising candidate for designing efficient catalysts.According to our detailed exper-imental characterization and theoretical calculations,unlike previous studies,black titanium oxide is formed as the final product in addition to white Ti(Ⅳ)oxide and disordered carbons after the complete oxidation of Ti3C2Tx.This work presents significant advancements in better understanding of 2D Ti3C2Tx(MXene)oxidation and enhances the prospects of this material for various applications.

2D materialsMXeneChemical degradationCatalysisHydrogen evolution reaction

Suvdanchimeg Sunderiya、Selengesuren Suragtkhuu、Solongo Purevdorj、Tumentsereg Ochirkhuyag、Munkhjargal Bat-Erdene、Purevlkham Myagmarsereejid、Ashley D.Slattery、Abdulaziz S.R.Bati、Joseph G.Shapter、Dorj Odkhuu、Sarangerel Davaasambuu、Munkhbayar Batmunkh

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Department of Chemistry,Division of Natural Sciences,School of Arts and Sciences,National University of Mongolia,Ulaanbaatar 14200,Mongolia

Queensland Micro-and Nanotechnology Centre,School of Environment and Science,Griffith University,Nathan campus,Brisbane,Queensland 4111,Australia

Department of Physics,Incheon National University,Incheon 22012,Republic of Korea

Australian Institute for Bioengineering and Nanotechnology,The University of Queensland,St Lucia,Brisbane,Queensland 4072,Australia

Adelaide Microscopy,The University of Adelaide,Adelaide,South Australia 5005,Australia

Centre for Organic Photonics & Electronics,School of Chemistry and Molecular Biosciences,The University of Queensland,St Lucia,Brisbane,Queensland 4072,Australia

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Australian Research CouncilAustralian Research CouncilFellow research grant of National University of Mongoliasupport of Griffith University internal grantsKing Abdullah University of Science and Technology(KAUST)through the Ibn Rushd Postdoctoral Fellowship AwardUS Office of Naval Research(ONR)Office of Naval Research Global(ONRG)

DE220100521DP200101217P2021-4197N62909-23-1-2035

2024

10.1016/j.jechem.2023.09.037

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.88(1)
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