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MXene and MAX Phase Materials
Research Guide
What is MXene and MAX Phase Materials?
MXene and MAX Phase Materials refer to a class of layered ternary carbides and nitrides known as MAX phases, from which two-dimensional transition metal carbides, carbonitrides, and nitrides called MXenes are derived by selective etching of the A-layer element.
MXenes are produced by exfoliation of MAX phases such as Ti3AlC2, yielding 2D Ti3C2 nanosheets, multilayer structures, and scrolls, as reported in 'Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub>3</sub>AlC<sub>2</sub>' (2011) with 10911 citations. The field encompasses 40,451 works focused on energy storage, electrochemical properties, batteries, capacitance, nanosheets, electrocatalysis, and photothermal conversion. MXenes feature surface terminations like hydroxyl, oxygen, or fluorine that provide hydrophilicity, enabling applications in energy storage as detailed in '2D metal carbides and nitrides (MXenes) for energy storage' (2017) with 6952 citations.
Topic Hierarchy
Research Sub-Topics
MXene Synthesis Methods
Researchers develop etching protocols from MAX phases, including HF-free selective etching and molten salt methods, to produce high-quality MXene flakes. Studies optimize yield, purity, and scalability for industrial applications.
MXene Electrochemical Energy Storage
This subfield focuses on MXenes as electrodes in supercapacitors and batteries, investigating pseudocapacitance, ion intercalation, and composite architectures. Performance metrics like capacitance retention and rate capability are benchmarked.
MXene Electrocatalysis
Investigations target MXene surface terminations and defects for HER, OER, ORR, and CO2 reduction, using DFT and in-situ spectroscopy. Heterostructure designs enhance activity and stability.
MXene Surface Chemistry
Studies characterize functional groups post-etching and their tunability via delamination or annealing, linking to hydrophilicity and electronic properties. Post-synthetic modifications enable tailored applications.
MXene MAX Phase Structures
Research elucidates crystal structures, phase stability, and composition-property relations in MAX phases using XRD, TEM, and ab initio calculations. Novel stoichiometries expand the MXene family.
Why It Matters
MXenes derived from MAX phases like Ti3AlC2 enable energy storage devices such as batteries and supercapacitors due to their metallic conductivity and hydrophilic surfaces. '2D metal carbides and nitrides (MXenes) for energy storage' by Anasori et al. (2017) highlights their use in capacitance and electrochemical applications, with the family expanding since Ti3C2 discovery in 2011 to include over 60 potential variants from corresponding MAX phases. '25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials' by Naguib et al. (2013) with 6005 citations notes MXenes' production via selective etching, supporting electrocatalysis and photothermal conversion in practical devices.
Reading Guide
Where to Start
'Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub>3</sub>AlC<sub>2</sub>' by Naguib et al. (2011) introduces MXene synthesis from Ti3AlC2 via HF exfoliation, providing the foundational discovery with clear visuals of 2D Ti3C2 nanosheets.
Key Papers Explained
'Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub>3</sub>AlC<sub>2</sub>' by Naguib et al. (2011) establishes MXene synthesis from MAX phases; '25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials' by Naguib et al. (2013) expands on the family size and etching process; '2D metal carbides and nitrides (MXenes) for energy storage' by Anasori et al. (2017) builds by detailing surface terminations and energy applications.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Expansion of MXene family from over 60 MAX phases continues, focusing on energy storage and electrocatalysis as per reviews up to 2017; no recent preprints available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Atomically Thin <mml:math xmlns:mml="http://www.w3.org/1998/Ma... | 2010 | Physical Review Letters | 14.8K | ✓ |
| 2 | Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub... | 2011 | Advanced Materials | 10.9K | ✓ |
| 3 | Van der Waals heterostructures | 2013 | Nature | 10.3K | ✓ |
| 4 | The chemistry of two-dimensional layered transition metal dich... | 2013 | Nature Chemistry | 9.5K | ✓ |
| 5 | Black phosphorus field-effect transistors | 2014 | Nature Nanotechnology | 8.2K | ✓ |
| 6 | 2D metal carbides and nitrides (MXenes) for energy storage | 2017 | Nature Reviews Materials | 7.0K | ✓ |
| 7 | 2D materials and van der Waals heterostructures | 2016 | Science | 6.9K | ✓ |
| 8 | A New Zirconium Inorganic Building Brick Forming Metal Organic... | 2008 | Journal of the America... | 6.9K | ✕ |
| 9 | Phosphorene: An Unexplored 2D Semiconductor with a High Hole M... | 2014 | ACS Nano | 6.3K | ✓ |
| 10 | 25th Anniversary Article: MXenes: A New Family of Two‐Dimensio... | 2013 | Advanced Materials | 6.0K | ✕ |
Frequently Asked Questions
What are MAX phases in the context of MXenes?
MAX phases are layered ternary carbides and nitrides, such as Ti3AlC2, that serve as precursors for MXenes. Selective etching of the A element, like aluminum in Ti3AlC2, yields two-dimensional MXenes. This process is detailed in 'Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub>3</sub>AlC<sub>2</sub>' by Naguib et al. (2011).
How are MXenes synthesized?
MXenes are synthesized by room-temperature exfoliation of MAX phases in HF, producing 2D Ti3C2 nanosheets from Ti3AlC2. The method opens synthesis for numerous other 2D crystals from over 60 MAX phases. Naguib et al. (2011) in 'Two‐Dimensional Nanocrystals Produced by Exfoliation of Ti<sub>3</sub>AlC<sub>2</sub>' reported this approach.
What properties make MXenes suitable for energy storage?
MXenes exhibit metallic conductivity from MAX phase precursors and hydrophilicity from surface terminations such as hydroxyl, oxygen, or fluorine. These enable high capacitance and electrochemical performance in batteries. Anasori et al. (2017) in '2D metal carbides and nitrides (MXenes) for energy storage' describe these traits.
What is the scope of MXene research?
Research covers 40,451 works on energy storage, batteries, capacitance, electrocatalysis, nanosheets, and photothermal conversion. The field stems from the 2011 discovery of Ti3C2 MXene. Key reviews include Naguib et al. (2013) in '25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials'.
Which MAX phase is commonly used for Ti3C2 MXene?
Ti3AlC2 is exfoliated to produce Ti3C2 MXenes, including nanosheets and multilayer structures. This member belongs to a group of over 60 layered ternary carbides and nitrides. The process is outlined in Naguib et al. (2011).
Open Research Questions
- ? How can surface terminations on MXenes be precisely controlled to optimize hydrophilicity and electrochemical performance?
- ? What etching conditions beyond HF enable scalable synthesis of MXenes from diverse MAX phases?
- ? Which MXene compositions achieve highest capacitance in energy storage relative to other 2D materials?
- ? How do MXene structures maintain stability under operational conditions in batteries and electrocatalysts?
- ? What MAX phase variants yield MXenes with superior photothermal conversion efficiency?
Recent Trends
The MXene and MAX phase field includes 40,451 works with topics in energy storage, batteries, and electrocatalysis; growth data over 5 years unavailable.
Highly cited papers like '2D metal carbides and nitrides (MXenes) for energy storage' by Anasori et al. (2017, 6952 citations) and '25th Anniversary Article: MXenes: A New Family of Two‐Dimensional Materials' by Naguib et al. (2013, 6005 citations) reflect sustained focus on synthesis and applications since 2011.
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