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Kruger, DdAuthorGarcia, HCorresponding Author
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Review

Molten Salt Derived MXenes: Synthesis and Applications

Publicated to:Advanced Science. 11 (35): e2307106- - 2024-07-17 11(35), DOI: 10.1002/advs.202307106

Authors: Kruger, Dawid D; Garcia, Hermenegildo; Primo, Ana

Affiliations

Univ Politecn Valencia, Inst Univ Tecnol Quim CSIC UPV, Av Naranjos S-N - Author

Abstract

About one decade after the first report on MXenes, these 2D early transition metal carbides or nitrides have become among the best-performing materials in electrode applications related to electrical energy storage devices and power-to-fuels conversion. MXenes are obtained by a top-down approach starting from the appropriate 3D MAX phase that undergoes etching of the A-site metal. Initial etching procedures are based on the use of concentrated HF or the in situ generation of this highly corrosive and poisonous reagent. Etching of the MAX phase is one of the major hurdles limiting the progress of the field. The present review summarizes an alternative, universal, and easily scalable etching procedure based on treating the MAX precursor with a Lewis acid molten salt. The review starts with presenting the current state of the art of the molten salt etching procedure to obtain or modify MXene, followed by a summary of the applications of these MXene samples. The aim of the review is to show the versatility and advantages of molten salt etching in terms of general applicability, control of the surface terminal groups, and uniform deposition of metal nanoparticles, among other features of the procedure. Synthesis methods of MXenes are rapidly advancing with the use of halide molten salt etchants. One-step synthesis of MXene-metal nanoparticle hybrids are enabled, and new areas of MXene surface chemistry are unlocked to include heavier halogens, and chalcogens by post-synthetic substitution. Herein, molten salt synthesis of MXene and MXene-hybrids and their applications in catalysis and energy storage are reviewed. image

Keywords
FluorineHydrofluoric-acidLewis acid max etchantsMax phaseMicrowave-absorptionMolten salt synthesisMxeneStorageSupercapacitorsSurface modificationSurface terminationsTopotactic transformationTransition-metal carbides

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Advanced Science due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2024 there are still no calculated indicators, but in 2023, it was in position 12/141, thus managing to position itself as a Q1 (Primer Cuartil), in the category Chemistry, Multidisciplinary. Notably, the journal is positioned above the 90th percentile.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-05-02:

  • WoS: 4
  • Scopus: 11
  • Europe PMC: 2
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-02:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 69.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 64 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 2.95.
  • The number of mentions on the social network X (formerly Twitter): 4 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Kruger, Dawid Daniël) and Last Author (Primo, A).

the authors responsible for correspondence tasks have been García Gómez, Hermenegildo and Primo, A.