Carbon Nanostructures for Energy Storage Applications

Carbon nanostructures encompass a diverse family of materials—ranging from nanotubes and graphene to hollow spheres, cages and capsules—whose exceptional electrical conductivity, mechanical robustness and tunable architecture have positioned them at the forefront of advanced energy storage technologies. By tailoring pore size distribution across micro-, meso- and macroporous regimes and by introducing structural motifs such as hollow interiors or hierarchical channels, researchers have greatly increased accessible surface area and accelerated ion transport. Heteroatom doping (for example with nitrogen, sulfur or phosphorus) further modulates electronic density and introduces active sites, boosting charge storage capacity and electrocatalytic activity. These attributes underpin enhanced performance in a variety of devices including supercapacitors, lithium–sulphur batteries, sodium-ion cells and emerging flow-battery chemistries. Recent efforts have concentrated on scalable, template-free synthetic routes, on hybrid composites incorporating metal or metal-organic framework-derived species, and on understanding structure–function relationships to improve energy density, power density and long-term cyclability under practical operating conditions.

Research from Nature Portfolio

Recent studies have demonstrated a facile, one-step carbonisation method yielding hollow carbon nanospheres of approximately 70 nm diameter with an ultrahigh specific surface area exceeding 3 000 m² g⁻¹. The resulting material exhibits enhanced adsorption of organic vapours, outstanding capacitance as supercapacitor electrodes and effective confinement of sulphur for lithium–sulphur batteries, establishing a versatile platform for multifunctional energy storage applications.

Investigations into nitrogen-doped microporous carbon spheres derived from polymer precursors have revealed the synergistic effects of high nitrogen content (over 10 at %) and well-defined microporosity (surface area ∼885 m² g⁻¹). Electrodes fabricated from these spheres achieve capacitances above 370 F g⁻¹ at low current densities, retain over 60 % of capacitance at tenfold higher rates and display excellent stability over more than 10 000 charge–discharge cycles, while also serving as high-performance electrocatalytic counter-electrodes in photovoltaic cells.

Shape-controlled hollow mesoporous carbon nanocapsules with adjustable geometry—ranging from spherical to semi-concave forms—have been synthesised using a general templating approach. The optimised semi-concave architecture, with specific surface area around 1 400 m² g⁻¹ and hierarchical porosity, delivers gravimetric capacitances above 320 F g⁻¹ and retains over 96 % of performance after thousands of cycles, underscoring the importance of hollow morphology in maximising packing density and ion accessibility.

Carbon Nanostructures for Energy Storage Applications publication trend

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

Technical terms

Specific surface area: Total surface area of a material per unit mass, a key metric for ion adsorption and charge storage.
Hierarchical porosity: The coexistence of pores of different size ranges (micro-, meso- and macropores) to optimise ion diffusion and storage.
Heteroatom doping: Incorporation of non-carbon elements (e.g. N, S, P) into the carbon lattice to introduce active sites and modulate electronic properties.
Carbonisation: Thermal decomposition of organic precursors under inert atmosphere to form graphitic or amorphous carbon structures.
Activation: Post-carbonisation treatment (physical or chemical) to generate additional porosity and enhance surface area.
Supercapacitor: Electrochemical device that stores energy through electrostatic adsorption of ions, characterised by high power density and long cycle life.
Electrocatalysis: Acceleration of electrochemical reactions at electrode surfaces, crucial for battery and fuel-cell processes.

References

1. Recent Progress of Hollow Carbon Nanocages: General Design Fundamentals and Diversified Electrochemical Applications. Advanced Science (2023).
2. Facile synthesis of ultrahigh-surface-area hollow carbon nanospheres for enhanced adsorption and energy storage. Nature Communications (2015).
3. Highly N-doped microporous carbon nanospheres with high energy storage and conversion efficiency. Scientific Reports (2017).
4. Biocompatible Mesoporous Hollow Carbon Nanocapsules for High Performance Supercapacitors. Scientific Reports (2020).
5. Recent Advances in the Fabrication and Functionalization of Nanostructured Carbon Spheres for Energy Storage Applications. KONA Powder and Particle Journal (2023).