Potassium-Doped Borophane Nanosheets
A Multifunctional Platform for Reversible Hydrogen Storage and Metal-Free Hydrogen Transfer
Rajamohanan Sobhana Anju (Universiteit van Amsterdam)
Pankaj Kumar (Indian Institute of Technology Roorkee)
Dhanaji R. Naikwadi (TU Delft - Applied Sciences)
Bettina Baumgartner (Universiteit van Amsterdam)
Savi Chaudhary (Indian Institute of Technology Bombay)
Atul Bansode (TU Delft - Applied Sciences)
Merel C. Konings (Vrije Universiteit Amsterdam)
Freek Ariese (Vrije Universiteit Amsterdam)
Prasad Gonugunta (TU Delft - Mechanical Engineering)
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Abstract
2D borophene has long been proposed as a promising hydrogen storage material, but experimental demonstrations remain limited to boron hydride sheets derived from MgB2. Here, we report the synthesis of potassium-doped borophane (BH) nanosheets, which serve as a high-capacity, reversible hydrogen storage platform and metal-free reducing agent. Through selective hydride transfer, the BH sheet efficiently converted levulinic acid (LA) to γ-valerolactone (GVL) under mild reaction conditions. Density functional theory (DFT) predicts a theoretical hydrogen content of 4.2 wt.% for the potassium-doped BH sheet. Remarkably, the dehydrogenated BH sheets can be partially regenerated under 50 bar H2, demonstrating reversible hydrogen storage. This work serves as an experimental validation for alkali-metal-modified borophanes acting as a multifunctional material for hydrogen storage and transfer, opening avenues for sustainable energy and other applications.
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