Compared to their carbon counterparts, BNNTs show manyunique electronic properties. For instance, BNNTs areuniformly semiconductors with a wide band gap regardless oftheir chirality or diameter 4, in contrast to carbon nanotubes(CNTs), which exhibit diversified metallic and semiconductingcharacteristics. Experimentally, Ma et al. 19 a 1.8 wt.
% hydrogen uptake was recorded for BNNTs at 10 MPa, and the bamboo-structured BN fibers had a 2.6 wt.% hydrogen capacity. Tang et al.
179 synthesized BNNTs with collapsed structures; they reported that the collapsed BNNTs could store hydrogen up to 4.2 wt. % at room temperature. Boron nitride nanotube (BNNT), which firstly predicted and synthesized by Rubio and Chopra respectively6, has a structural analogy to CNT but, contrary to the CNT being metallic (semiconductor) depending on chirality.
