What evidence gaps are holding back MXene materials?

Why do MXenes degrade so quickly, and what's missing to fix it?

The single biggest practical problem with MXenes is that they oxidize and lose their properties when exposed to air and moisture. A 2022 study on MXene electrodes for optoelectronics found that untreated titanium carbide (Ti3C2Tx) films showed significant changes in work function and sheet resistance after just 22 days in ambient air, making them unusable for real devices [7]. The same paper showed that adding a perfluorosulfonic acid (PFSA) barrier layer could stabilize the electrode, but this is a lab-scale fix, not a general solution [7].

Other papers confirm this is a systemic issue. A 2024 study on MXene textiles noted that 'the singular antimicrobial mechanism, poor antibacterial durability, and oxidation susceptibility of MXene limits their applications' [1]. They addressed it by coating MXene with a ZIF-8 layer that protected it from oxidation while also boosting antibacterial performance [1]. A 2026 review on polyphosphazene-functionalized MXene composites explicitly lists 'environmental stability, toxicity, and degradation mechanisms' as unresolved challenges [3]. The pattern is clear: every application that works in the lab has to invent a custom stabilization strategy, and there is no universal, scalable solution yet.

Supporting evidence from a 2025 review on MXene/chitosan composites also flags 'long-term stability' as a critical challenge [4]. A 2022 perspective on nitride MXenes points out that even the degradation mechanisms themselves are poorly characterized because most studies skip in-situ/operando analysis [8]. So the gap is twofold: we don't fully understand why MXenes degrade, and we lack general-purpose methods to stop it.

Can MXenes be made in large quantities, and what's the evidence?

The short answer is no—not yet. A 2026 large-scale analysis of over 18,000 MXene publications found that 'laboratory-scale investigations' dominate the field, with almost no work on industrial-scale production or lifecycle assessment [2]. A 2024 review on green energy storage states bluntly that 'the main problems related to two-dimensional materials are their difficult synthesis process, high cost, and bulk production, which hamper their performance' [5]. The same paper notes that hydrofluoric acid (HF) and modified acid (LiF + HCl) etching are the only established synthesis methods—both are hazardous and hard to scale [5].

A 2025 review on MXene hybrid architectures echoes this: 'practical and large-scale applications of these hybrid architectures, especially for targeted applications, still need to be explored' [10]. A 2026 review on polyphosphazene-MXene composites lists 'scalable production' as a key future direction [3]. Even the most promising applications—like EMI shielding, where MXene textiles achieved 47.7 dB efficiency [1]—are demonstrated on small samples, not production rolls.

The evidence converges: every review that addresses manufacturing says the same thing—synthesis is too dangerous, too expensive, and too small-scale. Until a fluoride-free, safe, and scalable synthesis route is proven, MXenes will remain a lab curiosity.

What don't we understand about how MXenes actually work?

A major gap is the lack of mechanistic understanding—we often know that MXenes perform well, but not why. A 2022 perspective on nitride MXenes is the most direct on this: 'the overwhelming majority revolve around carbide and their direct application to systems without understanding the underlying mechanism behind their performance' [8]. The paper specifically calls out the lack of in-situ/operando characterization (techniques that watch materials in action) as a 'major stopgap' [8]. This is not a minor issue—without knowing the mechanism, you cannot rationally design better materials.

This gap is especially acute for nitride MXenes. The same 2022 paper notes that while carbide MXenes have thousands of publications, nitride MXenes have only a handful, and even those lack mechanistic depth [8]. A 2023 review on thermoelectric MXenes also flags that 'the current state and challenges of research on improving the performance of MXene based thermoelectrics are explored, including pristine MXene and MXene based composites'—implying that even for well-studied carbides, the fundamental physics is not settled [6].

Supporting evidence comes from a 2023 perspective on COF/MXene heterostructures, which identifies 'research gaps that exist in designing COF/MXene heterostructures and the governing factors for improving the energy storage capability' [9]. A 2025 review on MXene-polymer composites similarly notes that 'key research gaps that need to be addressed to optimize MXene-polymer nanocomposites for industrial applications' include a poor understanding of structure-property relationships [11]. The pattern is consistent: the field has a lot of empirical results but thin theoretical and mechanistic foundations.

About These Sources

This answer is built on 11 peer-reviewed studies — published from 2022 to 2026, 7 from 2024 or later, 9 in Q1 journals, collectively cited 296 times — selected as the most relevant from 15 studies that passed quality screening, drawn from 87 papers retrieved from a database of over 500 million.

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