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1
ZnO-cellulose nanofibril (ZnO-CNF) hybrid synthesized via a sol-gel process with excellent productivity for a safer sunscreen

( Iqra Rabani ),서영수 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
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Zinc Oxide (ZnO) nanoparticles (NPs) integrated on the surface of cellulose nanofibril (CNF) were prepared by a sol-gel reaction and its size was controlled under various synthesis conditions. ZnO-CNF hybrid as a sunscreen has merits such as skin non-penetration of ZnO nanoparticle, enhanced water solubility or dispersibility, reduced photodamage of the skin from ZnO-mediated free radical formations (photocatalytic effect). Especially, photocatalytic effect of ZnO in water was found to be completely reduced by the hybridization, where it was measured by decolouration degree of an organic dye under UV irradiation. Integrated amount of ZnO on the CNF was obtained to be up to 78 wt% of the hybrid, which indicates that the hybridization was cost-effective as for a sunscreen with high sun protection impact factor.
2
Electrochemical, Photocatalytic and Photoluminescence properties of BaWO4 and rGO-BaWO4 nano-composites: A Comparative study

Sridhar Ch,Neha,Seo Young-Soo,Rabani Iqra,Turpu G.R.,Tigga Salinta,Padmaja G. 한국물리학회 2024 Current Applied Physics Vol.58 No.-
The rGO-BaWO4 (rGO-BWO) nanocomposites were synthesized by employing the ultrasonic-assisted co-precipitation method. Nanocomposites formed with BWO nanoparticles anchored to layers of reduced graphene oxide through in situ reduction and a homogeneous distribution of BWO nanoparticles were confirmed by SEM images. The rGO-BWO nanocomposite showed improved photocatalytic activity for the visible light degradation of Methylene Blue (MB) dye with a rate constant of 27 × 10 3 min 1 compared to pristine BWO. The band gaps for BWO nanoparticles estimated using UV–Vis DRS are of the order of 3.25 eV–4.25 eV, while they were 2.78 eV–3 eV for rGO BWO nanocomposites. The delocalized surface charges induced by the interactions between the rGO and BWO nanoparticles in the composite material might be responsible for the observed reduction in the band gap. Photoluminescent investigations demonstrate that rGO-BWO nanocomposites have a lower peak intensity compared to pure BWO particles, indicating a reduced recombination rate and better photocatalytic activity. In particular, when used as supercapacitor electrodes, the produced nanocomposites outperform BWO. Because of its larger surface area, the rGO-BWO nanocomposites display two-fold higher outcomes including 586, 571, 406, 375 and 307 F/g compared to BWO 391, 352, 291, 214 and 174 F/g at each current density 1, 2, 3, 5 and 10 A/g and faster charge transfer owing to improved porosity in the surface of rGO-BWO.
3
Facile and cost-effective growth of MoS2 on 3D porous graphene-coated Ni foam for robust and stable hydrogen evolution reaction

Hussain, Sajjad,Vikraman, Dhanasekaran,Truong, Linh,Akbar, Kamran,Rabani, Iqra,Kim, Hyun-Seok,Chun, Seung-Hyun,Jung, Jongwan Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.788 No.-
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Abstract To replace the costly, noble platinum electrocatalyst, the inexpensive, earth abundant and highly efficient electrocatalysts of layered transition metal dichalcogenides (TMDs) are explored for the hydrogen evolution reaction (HER). This paper describes cost-effective synthesis of 1T-MoS2 on 3D-graphene/Ni foam (NF) via a facile solution bath approach as an electrocatalyst for HER. The improved HER performances were observed due to the 3D-structure of MoS2/graphene. HER performance of MoS2/graphene/NF electrocatalyst exposed a superior catalytic performance with the low overpotential (−89 mV vs RHE) to drive the 10 mA cm−2, steep Tafel slope (45 mV dec−1), large exchange current density (4.16 × 10−1 mA cm−2), and robust stability over 18 h. Density functional theory (DFT) calculations also confirmed the reduced Gibbs free energy for H-adsorption (ΔGH) for MoS2/graphene compared to MoS2. The observed results suggest that the 1T-MoS2/graphene/NF is an interesting alternative to platinum-based catalyst for boosting HER efficiency. Highlights <UL> <LI> Active electrocatalyst of MoS2 decorated on graphene/NF by chemical route. </LI> <LI> Raman and XRD results confirmed the observation of 1T-MoS2. </LI> <LI> The robust stability over 18 h with over potential of 89 mV vs RHE was observed. </LI> <LI> DFT calculations explained in terms of density of states for high HER performance. </LI> </UL> Graphical abstract [DISPLAY OMISSION]