Themed collection Supercapacitors– Topic Highlight

New opportunities and challenges associated with amorphous MOFs for energy storage.

Designing hybrid materials with superior electrochemical properties has attracted tremendous interest in recent years for energy-storage applications owing to a high demand for energy sources and the depletion of fossil fuel resources.

Efficient ways of realizing energy and power dense rechargeable zinc ion hybrid supercapacitors (ZIHSCs) with advanced electrode and eletrolyte designing strategies have been reviewed.

Recent advances in the role of electrospun nanofibers based on transition metal oxides in advanced supercapacitor applications, its challenges and progress towards the future “zero emission electric era” are highlighted in this review.

The well-designed planar micro-supercapacitors can be manufactured through a variety of techniques for the applications in flexible electronics, biosensors, power grids and integrated chips.

The novel synthesis of carbon spherogels in organic solvents enables energy and solvent savings and omits supercritical drying. In addition, the resulting carbon spherogels feature excellent capacitance for energy storage in a supercapacitor setup.

A facile synthesis route for preparing manganese dioxide (MnO₂) with unique nano-needle morphology and its nanocomposite with reduced graphene oxide (MnO₂–rGO) for high energy density quasi-solid-state asymmetric supercapacitor.

Constructing intriguing morphologies of mono/multivalent materials e.g. NiCo₂O₄ leads to improvement in electrochemical activities due to high surface area and porosity. This is an eco-effective method for achieving higher performance in energy applications.

Co-CP, a 2D coordination polymer, synthesized via slow diffusion, serves as a supercapacitor electrode. The kinetic effects of three different electrolytic cations (Na⁺, K⁺, and Li⁺) in 3-electrode and 2-electrode setups were investigated further.

The fabricated asymmetric supercapacitor device (Cu₃Mn₁OS//AC) exhibits a very high energy density of 76.56 W h kg⁻¹ along with a power density of 985.01 W kg⁻¹ at 1 A g⁻¹ with superior electrochemical stability and efficiency over 10 000 cycles.

The functional groups in HBD for deep eutectic electrolytes have a profound impact on the self-discharge of supercapacitors.

Assembled ASC and corresponding red LED lightning via connection of two ASCs in series.

Untreated coal char is explored as an ultra-low cost supercapacitor material in various electrolytes.

Modeling electric double layer (EDL) capacitance with physics-informed Gaussian process regression (PhysGPR) avoids unphysical predictions that might be encountered in conventional machine learning methods.

Avocado-seed biomass-derived activated carbon was successfully synthesized by carbonization followed by chemical activation.

A green biodegradable hydrogel electrolyte was developed from chitosan biopolymer and KOH. This allows one to increase the energy density of carbon-based supercapacitors and to prevent the electrode degradation and current collector corrosion.

We demonstrate a new kind of conformal nanoelectrode for hierarchical supercapacitors made by ALD. This grass-like alumina (GLA) nanoelectrode increases the capacitance of PS supercapacitors fourfold or 4× and consists of a TiN-GLA-TiN stack.

The electrodes of NCS@NC LDH core–shell nanoarrays have high mass loading and superior conductivity of which the assembled asymmetric supercapacitor demonstrates a high energy density of 880 μW h cm⁻² (1.5 mW cm⁻²).