Synthesis Strategies for Two-Dimensional Transition Metal Borides (MBene) and Their Applications for Energy Conversion

Currently, the family of two-dimensional (2D) MXenes is restricted to metal carbides/nitrides, obtained by chemical exfoliation, i.e., removal (etching) of select layers in laminated 3D compunds. 2D borides likey possess properties distinct from those of MXenes and other 2D materials due to the electron-deficient character of boron in comparison with carbon.

Base on my recent achievement of synthesis of the first 2D metal boride, Mo4/3B2-xTz,  the purpose of this project is to expand this discovery to other 2D metal borides (MBenes), by extending chemical exfoliation concept to other boron-based laminates.I intend to use my expertise in the area of selective etching and establish independent research activities, including one PhD student, for realization of new 2D borides, targeting advanced hydrogen evolution reaction (HER) catalysts.

This will be achieved by a combination of compositional modification of laminated 3D solids, and the development of facile and green etching methods (organic base and acidic molten salts), beyond conventional etching techniques, and by investigating the correlation between composition, structure, and HER performance of the 2D borides.The present project will establish chemical exfoliation as a viable platform for synthesis of new 2D borides, for present and future technologies.

A multitude of novel 2D materials with tunable chemistry and structure can be expected, realizing HER catalysts with enhanced performance, for sustainable technologies.