A simple co-precipitation method has been adopted for the preparation of magnetically separable graphene zinc ferrite nanocomposite for highly efficient photocatalytic degradation of malachite green, fast green and eriochrome black T under visible light irradiation. The anchoring of zinc ferrite nanoparticles on graphene sheets not only inhibits the agglomeration of zinc ferrite nanoparticles but also decreases the band gap from 1.93 to 1.40 eV. The composite exhibits superior degradation efficiency in presence of hydrogen peroxide for all dyes under study. The dye degradation follows a pseudo firstorder reaction. The photocatalyst showed excellent performance even in the presence of highly concentrated inorganic salts and for a wide range of pH values. The composite retains its degradation capacity up to ten cycles. The composite described here can find potential applications for effective wastewater remediation from textile industries.

Designing an ultra-sensitive and stable sensor platform for realtime sensing of dopamine (DA), ascorbic acid (AA) and uric acid (UA) is highly desirable. A simple, green and facile method of synthesis of Ag nanoparticle (AgNP) decorated MoS 2 /rGO nanocomposite for simultaneous electrochemical detection of DA, AA and UA is reported. The unique structural morphology imparts higher electrical conductivity and electrochemical sensitivity to the prepared nanocomposite. The modified electrode material exhibits superior electrocatalytic perform-ance for the detection of DA within a wide linear range of 2.5 to 12.5 μм in presence of interfering electro-active species AA and UA, with limit of detection (LOD) of 0.009 μм. The sensor exhibits excellent stability with up to 500 repetitive cycles of Cyclic Voltammetry. Chronoamperometry and Electrochemical Impedance reveal sufficient electrochemical stability to find potential diagnostic applications. This nanostructure can emerge as a promising electrode for the detection of DA and UA in human urine samples.

A low temperature and facile solvothermal method was used to synthesise CuCo2S4 ‐ reduced Graphene Oxide (CuCo2S4‐rGO) composite. Nearly uniform anchoring of rGO was achieved which could prevent the agglomeration of CuCo2S4 effectively. Incorporation of CuCo2S4 within the graphene network has effectively reduced the restacking of the nanolayers, increased its surface area and augmented the electrochemical performance of the composite. Supercapacitor electrode fabricated from this composite exhibit excellent electrochemical stability upto 5000 repeated galvanostatic charge discharge cycle. The calculated specific capacitance value, from galvanostatic charge discharge, for the electrode is 1090 F ⋅ g−1 at 1 A ⋅ g−1. The material exhibits 992 F ⋅ g−1 specific capacitance even at elevated current density as high as 5 A ⋅ g−1 implying superior electrochemical stability. At 1 A ⋅ g−1 current density the material has energy density of 54.5 Wh ⋅ kg−1 with power density 543.94 W⋅kg−1 respectively. The electro‐kinetic study reveals that the material stores 69.35 % of total capacitance via capacitive controlled process.

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