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mxene quantum dots/Copper Nanocomposites for Synergistically Enhanced N_(2)Electroreduction

Energy & Environmental Materials 2023年第1期6卷 192-198页

作者： Yonghua Cheng Xingchuan Li Peng Shen Yali Guo Ke Chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Electrocatalytic N_(2) reduction reaction(NRR)represents an appealing solution for sustainable ammonia production,whereas exploring high-efficiency NRR catalysts is highly desired but extremely ***,we combine Ti_(3) C_(2)T_(x)-mxene quantum dots(MQDs)with porous Cu nanosheets to design a novel heterostructured MQDs/Cu as an effective and durable NRR ***,MQDs/Cu showed a synergistically enhanced NRR activity with an NH_(3) yield of 78.5 lg h^(-1) mg^(-1)(-0.5 V)and a Faradaic efficiency of 21.3%(-0.4 V),far superior to pure MQDs and Cu,and outperforming the majority of the state-of-the-art NRR *** function theory computations demonstrated that the synergy of MQDs and Cu enabled the creation of interfacial Cu-Ti dimer as dual-active-centers to strongly activate the absorbed N 2 and promote the*N_(2)H formation,consequently resulting in the much reduced energy barriers and greatly enhanced NRR performance.

关键词： density functional theory electrocatalytic nitrogen fixation heterostructure mxene quantum dots

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Highly fluorescence Ta_(4)C_(3) mxene quantum dots as fluorescent nanoprobe for heavy ion detection and stress monitoring of fluorescent hydrogels

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Chinese Chemical Letters 2022年第4期33卷 1850-1854页

作者： Shouzhen Li Junfei Ma Xuelin Zhao Peide Zhu Meng Xu Yingchun Niu Dixian Luo Quan Xu State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development National Energy Shale Oil Research and Development CenterChina University of Petroleum(Beijing)Beijing 102249China Department of Musculoskeletal Tumor Senior Department of Orthopedicsthe Fourth Medical Center of PLA General HospitalBeijing 100142China Department of Laboratory Medicine Huazhong University of Science and Technology Union Shenzhen Hospital(Nanshan Hospital)Shenzhen 518000China

Compared with other transition metal mxene derived quantum dots(MQD_(S)),Ta-based mxene quantum dots have good functionality,but Ta-based mxene quantum dots and their applications have not been studied so *** this paper,we report for the first time the synthesis of high fluorescence quantum yield(QY) N-doped Ta_(4)C_(3) quantum dots(N-MQDs) using Ta_(4)C_(3) quantum dots in acid reflux damaged Ta_(4)C_(3) nanosheets as precursors and ethylenediamine as nitrogen *** prepared N-MQDs have excellent blue photoluminescence(PL) properties,particle size is only 2.60 nm,QY is up to 23.4%,and good *** addition,it has been reported that N-MQDs can be used as fluorescent probe for detection of Fe;and remote force sensing analysis In liquid ion sensing,N-MQDS shows a unique selective quenching of Fe;with a detection limit as low as 2 μmol/L,and has great potential as a fast and super-sensitive fluorescent probe for the detection of heavy *** importantly,in solid mechanics sensing,the introduction of N-MQDs into self-healing hydrogels can be developed into a fluorescent hydrogel that can be used for accurate remote force measurement and applied in the field of mechanical sensing ***,Ta-based N-MQDs show excellent potential in the field of fluorescence sensing,which provides a door for multi-dimensional sensing of new materials in the future.

关键词： mxene quantum dots Fluorescent probe Fluorescent hydrogel Hydrothermal method quantum yield

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