An in situ synthesis of a new nanocomposite, polyaniline/manganese dioxide/ titanium dioxide (PANI/MnO 2 /TiO 2 ), via a one-pot oxidative polymerization method at room temperature is described in this article. The characterization was done on the synthesized nanocomposite using UV−vis, FT-IR, XRD, TGA, SEM, and TEM analysis. A superior catalytic activity is exhibited by the synergistic PANI/MnO 2 /TiO 2 nanocomposite in the conversion of toxic Cr 6+ to benign Cr 3+ in comparison with PANI, MnO 2 , TiO 2 , PANI/MnO 2 , PANI/TiO 2 , MnO 2 /TiO 2 , and other nanocomposite materials reported. The reduction rate is dependent on the concentration of substrate (Cr 6+ ), oxidant (HCOOH), and catalyst, pH, temperature, and foreign ions. The PANI/MnO 2 /TiO 2 reveals an excellent conversion (99.9%), rate constant (15.97 × 10 −2 min −1 ), and turnover frequency (0.3333 mmol/mg/min) in the reduction of Cr 6+ . The results obtained from this study illustrate that the prepared nanocomposite, PANI/MnO 2 /TiO 2 , can be very well used as an effective and economically viable catalyst for the reduction of toxic contaminant Cr 6+ from wastewater.

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Since its discovery in 1839, research on the synthesis and application of perovskite materials has multiplied largely due to their suitability to be used in the fields of nanotechnology, chemistry and material science. Appropriate changes in composition or addition of other elements or blending with polymers may result in new hybrid and/or composite perovskite materials that will be applied in advanced fields. In this review, we have recapitulated the recent progress on perovskite nanomaterial in solar cell, battery, fuel cell and supercapacitor applications, and the prominence properties of perovskite materials, such as excellent electronic, physical, chemical and optical properties. We discussed in detail the synthesis and results of various perovskite hybrid nanomaterials published elsewhere. We have also discussed the results of various studies on these low dimensional composite nanomaterials in broad sectors such as electronics/optoelectronics, batteries, supercapacitors, solar cells and electrochemical sensors.