Hollow Nanostructures for Electrochemical Energy Storage

Hollow nanostructures encompass a class of engineered materials in which internal voids and thin shells combine to deliver high surface area, reduced ion diffusion distances and enhanced accommodation of mechanical stress during charge and discharge. Variants include single‐shelled hollow spheres, yolk–shell architectures in which an inner core is enclosed by an outer shell, and multi­shelled constructs with two or more concentric cavities. Synthetic strategies range from hard-templating and soft-templating to self-templating processes such as the Kirkendall effect or Ostwald ripening. These controlled architectures can be optimised to balance energy density, power density and cycling stability in lithium-ion, sodium-ion and emerging battery technologies, as well as in supercapacitors. By tailoring shell porosity, cavity size and hierarchical ordering, researchers have achieved substantial improvements in specific capacity, rate capability and long-term durability. Ongoing challenges include scalable manufacture of uniform structures, mechanistic understanding of structural evolution and integration with conductive matrices. Future directions point towards composite hollow materials, in situ structural characterisation and smart architectures that respond dynamically to operating conditions.

Research from Nature Portfolio

Recent work on hierarchical nanoporous microstructures has demonstrated one-step chemical reduction of metal oxide precursors to yield hollow microcubes and foam-like particles. Control of reduction kinetics via the Kirkendall effect leads to well-defined pores and cavities, delivering enhanced electrochemical performance compared with solid counterparts and highlighting the role of internal channels in fast ion transport. Another study of hollow multi-shelled architectures has revealed that sequential mass transport stages in triple-shelled frameworks can be orchestrated through combined chemical diffusion and physical barrier effects. Although first evidenced for controlled molecular release, the principles translate directly to tuning ion diffusion pathways and sustaining electrode performance under varying potentials, thereby offering a blueprint for smart, responsive energy storage materials.

Hollow Nanostructures for Electrochemical Energy Storage publication trend

The graph below shows the total number of articles in hollow nanostructures for electrochemical energy storage across all publications each year (not limited to Nature Index journals).

Technical terms

Hollow nanostructure: A nanoscale material featuring an internal cavity enclosed by a thin shell, offering high surface area and short diffusion paths.

Yolk–shell structure: A configuration in which a discrete core ("yolk") resides within a hollow shell, allowing independent movement and stress buffering.

Multi-shelled structure: A hollow architecture composed of two or more concentric shells separated by cavities, enhancing hierarchical transport and storage.

Kirkendall effect: A self-templating process driven by unequal diffusion rates of species in a solid, resulting in the spontaneous formation of hollow or porous structures.

Self-templating synthesis: A fabrication approach where precursors transform into hollow or hierarchical architectures without external templates, driven by internal chemical or physical gradients.

Specific capacity: A measure of charge storage per unit mass of active material, typically expressed in milliampere-hours per gram (mAh g^–1).

References

1. Synthesis of Hierarchical Nanoporous Microstructures via the Kirkendall Effect in Chemical Reduction Process. Scientific Reports (2015).
2. Sequential drug release via chemical diffusion and physical barriers enabled by hollow multishelled structures. Nature Communications (2020).
3. Mesoscience in Hollow Multi‐Shelled Structures. Advanced Science (2023).
4. Mechanisms for self‐templating design of micro/nanostructures toward efficient energy storage. Exploration (2022).
5. Controllable synthesis of mesostructures from TiO 2 hollow to porous nanospheres with superior rate performance for lithium ion batteries. Chemical Science (2016).