A new kind of two-dimensional (2D) material MXene (early transition metal carbides,
nitrides and carbonitrides) is obtained by selective etching the A element from the MAX phases.
MXene exhibits both the metallic conductivity and the hydrophilic nature due to its metal layer structure
and hydroxyl or oxygen terminated surfaces. This review provides an overview of the MXene
used in the electrolytes and electrodes for the fuel cells and water splitting. MXene with functional
groups termination could construct ion channels that significantly benefit ion conductivity through
the electrolyte. The metal supported by MXene interaction offers electronic, compositional, and
geometric effects that could enhance the catalytic activity and stability. MXene has already shown
promising performance for fuel cells and water electrolysis. Herein, the etching and intercalation
methods of MXene in recent years are summarized. The applications of MXene for fuel cells electrolyte,
catalyst and water splitting catalyst are revealed to provide a more brief idea for MXene used as
new energy materials.
Keywords: MXene, fuel cell, water electrolysis, catalyst, electrolyte, electrode.
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