Pseudocapacitive performance of a solution-processed β-Co(OH)2 electrode monitored through its surface morphology and area

In the present study, beta-cobalt hydroxide (β-Co(OH)₂) electrodes of various nanostructures and surface areas, viz. nano-rhombuses (NRs), nano-plates (NPs), and nano-grass (NGs), have been synthesized directly onto a stainless-steel (SS) substrate using a simple, economical and binder-free chemical solution-process, utilizing three cobalt precursor salts, i.e. cobalt acetate, cobalt chloride, and cobalt nitrate, respectively. Structural elucidation proves the crystallite size, type and phase-purity of β-Co(OH)₂, whereas the surface morphology analysis supports the evolution of the above mentioned nanostructures of various surface areas. The electrochemical pseudocapacitor performance investigation demonstrates a specific capacitance (S_c) of 367 F g^-1 at 1 mA cm^-2 for the NP-type morphology, which is higher than that that displayed by the other morphologies. This change in S_c value is attributed to different charge transfer resistance values, which have been obtained from electrochemical impedance spectroscopy spectra. Finally, we attempt to correlate the relationship between the surface morphology, i.e. surface area, and the charge transfer resistance with the obtained specific capacitance value of the respective electrode.

Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

We report for the first time a room temperature smart NH₃sensor based on PAni–Fe₂O₃nanocomposite loading on flexible PET substrate byin situchemical oxidative polymerization method.

Facile method of preparation of PbS films for NO2 detection

A simple and inexpensive chemical bath deposition method was employed for the preparation of lead sulfide (PbS) thin films.

Electrochemical supercapacitor development based on electrodeposited nickel oxide film

A nickel oxide (NiO) electrode has been synthesized electrochemically, which is envisaged for supercapacitor application.

Highly selective and sensitive CdS thin film sensors for detection of NO2 gas

We demonstrate the preparation of cadmium sulfide (CdS) thin films via a facile chemical bath deposition method.

Camphor sulfonic acid doped PPy/α-Fe2O3 hybrid nanocomposites as NO2 sensors

PPy/α-Fe₂O₃ hybrid nanocomposites with different weight percentages (10–50%) of CSA were successfully prepared by using a solid state synthesis method for NO₂ gas detection at room temperature.