| 초록 |
Mg-based hydrogen storage is of great interest due to its high gravimetric/volumetric hydrogen storage capacity and excellent reversibility. However, the practical use of unmodified Mg is severely hampered by sluggish kinetics and volume change upon hydrogen ab/desorption. Realizing the nanoporous Mg structure is a potentially advantageous approach for alleviating the volume expansion and increasing the area of the H2 gas-solid interface. Additionally, the nanosized ligaments in porous Mg lead to a significantly shorten atomic diffusion length of hydrogen atoms, reducing the activation barrier of hydrogen absorption. Here, we prepared nanoporous Mg structure via electrochemical dealloying without using any corrosive reagents. The hydrogen sorption kinetics of nanoporous Mg is improved compared to its bulk counterpart, indicating that the porous structure with nanosized ligaments similarly behaves to the reported nanosized Mg. This suggests that the nanoporous Mg structure can be a viable solution for overcoming the limitations of conventional Mg-based hydrogen storage, allowing rapid hydrogen ab/desorption and developing the resistance to volume expansion simultaneously. |
