Mo2-xCTz MXenes前驱体合金化缺陷工程及其对电化学性能的影响

IF 7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Rodrigo M. Ronchi, Ningjun Chen, Joseph Halim, Per O. Å. Persson, Johanna Rosen
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引用次数: 0

摘要

以故意制造缺陷的形式进行的缺陷工程已被证明可以在各种应用中增强二维材料的性能。本文通过第一性原理计算和实验相结合,系统地探索了一种简单、可重复的方法来引入mo基MXenes中的随机空位和孔隙。该工艺基于将Mo2Ga2C与Cr合金化,Cr是一种元素,与Ga一起在氢氟酸中选择性蚀刻,从而在MXene薄片中产生空位和空位团簇。在Mo2-xCrxC前驱体粉末中,Cr在金属部位的掺入极限约为60原子%。由于Cr含量的增加促进了另一种MAX相(Mo2-xCrxGaC)的形成,因此在随后的合成中使用了较低的浓度(高达25原子%)。由Mo1.87Cr0.13Ga2C(6.5原子% Cr)衍生的Mo1.87CTz MXene表现出优异的电化学性能,在2 mVs-1扫描速率下达到1117 Fcm-3的体积电容,表明缺陷浓度可以调节速率能力。总的来说,我们已经证明了在MAX阶段使用Cr作为牺牲元素是一种简单有效的MXenes缺陷工程策略。此外,该方法可以扩展到包括其他牺牲元素和MAX相,使MXene缺陷工程成为各种应用(包括储能和催化)性能增强的可行途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Defect Engineering of Mo2–xCTz MXenes through Precursor Alloying and Effects on Electrochemical Properties

Defect Engineering of Mo2–xCTz MXenes through Precursor Alloying and Effects on Electrochemical Properties
Defect engineering in the form of the intentional creation of defects has been shown to enhance the properties of two-dimensional materials in various applications. Herein, we systematically explore a simple and reproducible method for introducing random vacancies and pores in Mo-based MXenes by combining first-principles calculations and experiments. The process is based on alloying Mo2Ga2C with Cr, which is an element that, together with Ga, is selectively etched in hydrofluoric acid, resulting in vacancies and vacancy clusters in the MXene sheets. The limit of Cr incorporation on the metal site was found to be approximately 60 atom % in the precursor powder Mo2–xCrxC. Lower concentrations, up to 25 atom %, were used in the subsequent synthesis of Mo2–xCrxGa2C, since an increasing Cr content promoted the formation of another MAX phase (Mo2–xCrxGaC). A Mo1.87CTz MXene derived from Mo1.87Cr0.13Ga2C (6.5 atom % Cr) exhibited excellent electrochemical behavior, reaching a volumetric capacitance of 1117 Fcm–3 at 2 mVs–1 scan rate, and suggested that defect concentration can be used to tune the rate capability. Overall, we have demonstrated that using Cr as a sacrificial element in the MAX phase is a simple and effective strategy for the defect engineering of MXenes. Moreover, this method can likely be extended to include other sacrificial elements and MAX phases, making MXene defect engineering a viable pathway for property enhancement across various applications, including energy storage and catalysis.
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来源期刊
Chemistry of Materials
Chemistry of Materials 工程技术-材料科学:综合
CiteScore
14.10
自引率
5.80%
发文量
929
审稿时长
1.5 months
期刊介绍: The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.
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