Interlayer Hydrogen-Hydrogen Spacing Regulates the Formation of Molecular Hydrogen in Hydrogen Boride Nanosheets

Hydrogen carriers that enable efficient transport and on-demand release of molecular hydrogen (H₂) are crucial for practical hydrogen-based energy systems. Hydrogen boride (HB) nanosheets, composed of boron and hydrogen in a 1:1 stoichiometric ratio, have promising potential as safe and lightweight hydrogen carriers owing to their high gravimetric hydrogen density (8.5 wt %). In particular, heating of HB nanosheets results in H₂ release over a broad temperature range from 363 to 1473 K. However, the mechanism of the multimodal H₂ desorption remains unclear. In this work, we elucidate that the interlayer H···H distances (d_H···H) determine the multimodal desorption of H₂ especially in the lower-temperature range (<623 K). HB nanosheets subjected to various temperatures under different H₂ pressures were prepared to investigate the thermal stability of their bonding configurations. Infrared spectroscopy and temperature-programmed desorption measurements revealed the occurrence of hydrogen depletion while the bonding configuration remains unchanged. The first to third nearest d_H···H, along with the numbers of the corresponding H···H pairs, were systematically calculated for four possible interlayer stacking types. The calculated H···H pairs distribution closely matched the experimental profile for the thermally induced H₂ desorption, suggesting that the multimodal desorption of H₂ in the lower-temperature range is governed by the distribution of hydrogen distances. This study elucidates the mechanisms of H₂ formation in HB nanosheets and provides valuable insights into the design of two-dimensional hydrogen containing materials.