Electrochemical Performance in High-Performance Supercapacitors

High-performance supercapacitors bridge the gap between conventional capacitors and batteries by combining rapid charge–discharge kinetics with elevated energy and power densities. Their electrochemical performance hinges on two complementary mechanisms: electric double-layer capacitance, arising from the accumulation of ions at electrode–electrolyte interfaces, and pseudocapacitance, based on fast, surface-confined redox reactions. Optimising electrode architecture—through high-surface-area materials, hierarchical porosity and conductive frameworks—facilitates efficient ion diffusion and electron transport. Key performance metrics include specific and areal capacitance, rate capability and long-term cycling stability, all of which dictate practical applications in grid stabilisation, electric mobility and wearable electronics. Advances in nanostructuring, composite formulations and binder-free assemblies have driven significant improvements, enabling devices that deliver both high energy storage and rapid power delivery in compact formats.

Research from Nature Portfolio

Microwave-assisted synthesis of porous nickel cobaltite microspheres has demonstrated a scalable route to high-mass-loading electrodes capable of delivering large areal capacitance and energy density in both symmetric and asymmetric aqueous systems. Vertically aligned carbon nanospheres coated with nickel cobaltite produce core-shell sub-microspheres exhibiting specific capacitances exceeding 1400 F g-1 and negligible degradation over thousands of cycles. Hierarchical three-dimensional core–shell nanocactus arrays of nickel cobaltite grown directly on conductive substrates combine mesoporous architectures with abundant active sites, achieving specific capacitances above 1200 F g-1, over 90 % retention after extensive cycling and dual functionality as supercapacitor and battery electrodes.

Electrochemical Performance in High-Performance Supercapacitors publication trend

The graph below shows the total number of articles in electrochemical performance in high-performance supercapacitors across all publications each year (not limited to Nature Index journals).

Technical terms

Electric Double-Layer Capacitance (EDLC): Charge storage via separation of ions at the electrode–electrolyte interface without faradaic reactions.

Pseudocapacitance: Fast, reversible surface redox processes contributing to additional capacitance beyond the double layer.

Specific Capacitance: Capacitance normalised per unit mass of active material (F g-1).

Areal Capacitance: Capacitance expressed per electrode area (mF cm-2), critical for microscale devices.

Rate Capability: Ability to maintain capacitance at high charge-discharge currents.

Cycling Stability: Retention of capacitance over repeated charge–discharge cycles, indicating long-term durability.

References

1. Microwave Assisted Synthesis of Porous NiCo2O4 Microspheres: Application as High Performance Asymmetric and Symmetric Supercapacitors with Large Areal Capacitance. Scientific Reports (2016).
2. Facile Synthesis of Carbon Nanosphere/NiCo2O4 Core-shell Sub-microspheres for High Performance Supercapacitor. Scientific Reports (2015).
3. Hierarchical Core/Shell NiCo2O4@NiCo2O4 Nanocactus Arrays with Dual-functionalities for High Performance Supercapacitors and Li-ion Batteries. Scientific Reports (2015).
4. Room Temperature Synthesis of Vertically Aligned Amorphous Ultrathin NiCo‐LDH Nanosheets Bifunctional Flexible Supercapacitor Electrodes. Energy & Environmental Materials (2023).
5. Hierarchical pipe cactus-like Ni/NiCo-LDH core–shell nanotube networks as a self-supported battery-type electrode for supercapacitors with high volumetric energy density. Journal of Materials Chemistry A (2022).
6. Hierarchical PANI/NiCo-LDH Core-Shell Composite Networks on Carbon Cloth for High Performance Asymmetric Supercapacitor. Nanomaterials (2019).