Supercritical CO2-Mediated Synthesis of CNT@Co3O4 Nanocomposite and Its Application for Energy Storage

Supercritical carbon dioxide assisted formation of crystalline materials for various energetic applications

This highlight gives an overview of recent advances in production of crystalline materials for high energy density applications for rechargeable batteries and solar cells or energetic compounds in supercritical carbon dioxide medium.

In Search of Factors Determining Activity of Co3O4 Nanoparticles Dispersed in Partially Exfoliated Montmorillonite Structure

The paper discusses a formation of Mt–PAA composite containing a natural montmorillonite structure partially exfoliated by poly(acrylic acid) introduced through intercalation polymerization of acrylic acid. Mt–PAA was subsequently modified by controlled adsorption of Co²⁺ ions. The presence of aluminosilicate packets (clay) and carboxyl groups (hydrogel) led to the deposition of significant amounts of Co²⁺ ions, which after calcination formed the Co₃O₄ spinel particles. The conditions of the Co²⁺ ions’ deposition (pH, volume and concentration of Co(NO₃)₂ solution, as well as a type of pH-controlling agent) were widely varied. Physicochemical characterization of the prepared materials (including X-ray fluorescence (XRF), X-ray powder diffraction (XRD), low-temperature nitrogen adsorption, X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (H₂-TPR)) revealed that the modification conditions strongly influenced the content as well as the distribution of the Co₃O₄ active phase, tuning its reducibility. The latter parameter was, in turn, very important from the point of view of catalytic activity in the combustion of aromatic volatile organic compounds (VOCs) following the Mars–van Krevelen mechanism.

Anchoring of ultrafine Co3O4 nanoparticles on MWCNTs using supercritical fluid processing and its performance evaluation towards electrocatalytic oxygen reduction reaction

Anchoring ultrafine Co₃O₄ nanoparticles on MWCNTs using a supercritical fluid showed high ORR performance.

Diethylenetriamine-assisted in situ synthesis of TiO2 nanoparticles on carbon nanotubes with well-defined structure and enhanced photocatalytic performance

In solvothermal conditions, DETA will work as a connecting bridge to in situ form TiO₂/CNT composites with a well-defined structure and enhanced photocatalytic performance.

Layer-structured nanohybrid MoS2@rGO on 3D nickel foam for high performance energy storage applications

MoS₂@reduced graphene oxide on 3D nickel foam was synthesized using an inexpensive room-temperature two-step method composed of the layer-by-layer method and solution-based successive ionic layer adsorption and reaction.