Hydrogen Storage Properties of Palladium Nanomaterials

Palladium nanomaterials exhibit exceptional capacity for hydrogen uptake, owing to their unique ability to adsorb hydrogen atoms at the surface and absorb them into the lattice to form reversible hydride phases. At the nanoscale, the enhanced surface‐to‐volume ratio accelerates hydrogen diffusion and reduces the critical pressure for phase transitions between the low‐hydrogen α‐phase and the high‐hydrogen β‐phase. Nanostructuring—such as engineering cubes, rods or alloyed particles—enables precise control over lattice strain, defect density and electronic structure, which in turn modulate storage capacity, kinetics and cyclic stability. Bimetallic solid‐solution nanoparticles further allow tuning of the d‐band centre and hydride formation enthalpy to improve reversible uptake. Thermodynamic mapping via surface Pourbaix diagrams elucidates the stability of hydrogen‐covered surfaces under electrochemical conditions. These advances point to practical applications in compact on-board hydrogen storage, smart sensors and fuel-cell technologies, bridging fundamental insights with scalable energy solutions.

Research from Nature Portfolio

Real-time environmental transmission electron microscopy has captured hydrogen absorption dynamics in single-crystalline palladium nanocubes, revealing phase nucleation at cube corners, lattice misorientation during β-phase propagation and self-healing upon desorption, which underpins exceptional cyclability. Investigations of individual pentatwinned palladium nanorods have shown that hydrogen-induced phase coexistence emerges above a critical length, with preferential nucleation at rod tips and defect formation along phase boundaries, highlighting shape-dependent thermodynamics. Atomic-scale studies of Pd–Pt solid-solution nanoparticles demonstrate that alloying alters vacancy formation and electronic band structure to enhance hydride stability, yielding tailored storage enthalpies and increased capacity in low-Pt compositions.

Hydrogen Storage Properties of Palladium Nanomaterials publication trend

The graph below shows the total number of articles in hydrogen storage properties of palladium nanomaterials across all publications each year (not limited to Nature Index journals).

Technical terms

Adsorption: adherence of hydrogen atoms to the external surface of palladium nanomaterials.

Absorption: uptake of hydrogen atoms into the palladium lattice to form hydride phases.

α-phase: palladium hydride phase with low hydrogen concentration and minimal lattice expansion.

β-phase: palladium hydride phase with high hydrogen concentration and significant lattice expansion.

Surface Pourbaix diagram: thermodynamic map of surface states as a function of electrode potential and pH.

References

1. Direct visualization of hydrogen absorption dynamics in individual palladium nanoparticles. Nature Communications (2017).
2. In-situ visualization of solute-driven phase coexistence within individual nanorods. Nature Communications (2018).
3. Hydrogen storage and stability properties of Pd–Pt solid-solution nanoparticles revealed via atomic and electronic structure. Scientific Reports (2017).
4. Computational surface Pourbaix diagrams to unravel cathodic hydride formation on defective palladium surfaces. International Journal of Hydrogen Energy (2024).
5. Interactions between Hydrogen and Palladium Nanoparticles: Resolving Adsorption and Absorption Contributions. ChemElectroChem (2023).