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1
Supercapacitor and OER activity of transition metal (Mo, Co, Cu) sulphides

Jansi Rani, B.,Pradeepa, S.S.,Hasan, Zinab M.,Ravi, G.,Yuvakkumar, R.,Hong, S.I. Elsevier 2020 The Journal of physics and chemistry of solids Vol.138 No.-
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Abstract Multifunctional transition metal (Mo, Co, Cu) sulphide electrocatalysts were synthesized employing hydrothermal method with stabilization at 180 °C for 24 h for both supercapacitors and water splitting applications. Rhombohedral (MoS2) and hexagonal (CoS and CuS) structures of the electrocatalysts were identified from the X-ray diffraction patterns. Raman-active modes confirmed the characteristic phonon vibrations. The prepared sulphides optical studies were examined employing photoluminescence spectroscopy and UV spectroscopy. Morphological variations observed for different sulphide nanostructures were confirmed by the scanning electron microscopy images. A comparative electrochemical study of MoS2, CoS and CuS was performed. Of the three candidates, MoS2 has superior capacitive behaviour, exhibiting very high specific capacitance of 513F/g at 0.5 A/g, and moreover exhibited the highest oxygen evolution reaction current density of 442.7 mA/g at a scan rate of 10 mV/s. Furthermore, it maintained its performance for longer in 1000 cycles of galvanostatic charging and discharging and in 12 h of an oxygen evolution reaction stability test. Highlights <UL> <LI> High specific capacitance of 513 F/g at 0.5 A/g was achieved for MoS2. </LI> <LI> Stability of 98% was achieved for MoS2 after 1000 cycles of galvanostatic charging and discharging. </LI> <LI> A high current density of 442 mA/g was achieved at 10 mV/s. </LI> <LI> After a chronoamperometry test for 12 h, 100% oxygen evolution reaction activity was obtained for MoS2. </LI> <LI> The MoS2 electrode is highly recommended as an efficient electrode for energy applications. </LI> </UL> Graphical abstract [DISPLAY OMISSION]
2
Novel NiWO4 nanoberries morphology effect on photoelectrochemical properties

Babu, Eadi Sunil,Rani, B. Jansi,Ravi, G.,Yuvakkumar, R.,Guduru, Ramesh K.,Ganesh, V.,Kim, Sungjin Elsevier 2018 Materials letters Vol.220 No.-
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Abstract We report a novel method to synthesis NiWO4 nanoberries and their morphology dependent photoelectrochemical properties. XRD result revealed monoclinic wolframite NiWO4 structure formation. FESEM and TEM showed average particle and nanoberries size of 4 and 50 nm respectively. Raman active stretching W–O vibration mode at 889 cm−1, PL blue green emission of intrinsic WO6 6− complex with double emission center (3T1u-1A1g) and FTIR spectrum confirmed NiWO4 formation with a calculated band gap of 2.86 eV. The much higher photocurrent of 0.03 mA/cm2 was obtained at 0 V potential under visible light due to higher band gap (2.86 eV) of nanoberries morphology which led to efficient light absorption and increase in electron and hole separations. Highlights <UL> <LI> Novel synthesis of NiWO4 nanoberries morphology. </LI> <LI> Higher photocurrent of 0.03 mA/cm2 due to higher band gap 2.86 eV. </LI> <LI> Nanoberries morphology led to absorption, increase electron hole separations. </LI> </UL> Graphical abstract Graphical abstract clearly shows the schematic representation of nanoberries formation which is evident that the effect of surfactant for the formation of a big berry contains number of small berries. [DISPLAY OMISSION]
3
Vertically aligned Cu-ZnO nanorod arrays for water splitting applications

Babu, Eadi Sunil,Rani, B. Jansi,Ravi, G.,Yuvakkumar, R.,Guduru, Ramesh K.,Ravichandran, S.,Ameen, Faud,Kim, Sungjin,Jeon, Heung Woo Elsevier 2018 Materials letters Vol.222 No.-
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Abstract Vertically aligned Cu-ZnO nanorod arrays were grown using thermal deposition method. Optimum Cu-ZnO and morphology tailoring effect was investigated. Enhanced photoelectrochemical (PEC) activity (0.92 ± 0.2 mA/cm2) and high photon conversion efficiency (PCE) (0.3490 ± 0.2%) was observed for 5 wt% Cu-ZnO. Cu optimum dopant with ZnO lattice is a promising PEC candidate for water splitting applications. Highlights <UL> <LI> One step synthesis was adapted to grow vertically aligned nanorod arrays. </LI> <LI> Enhanced photoelectrochemical (PEC) performance of 0.349 ± 0.2% was achieved. </LI> <LI> Highest photon conversion efficiency (PCE) of 0.349 ± 0.2% was achieved. </LI> </UL> Graphical abstract [DISPLAY OMISSION]

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