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Electrosynthesis of copper phosphide thin films for efficient water oxidation
Pawar, Sambhaji M.,Pawar, Bharati S.,Babar, Pravin T.,Aqueel Ahmed, Abu Talha,Chavan, Harish S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Inamdar, Akbar I.,Kim, Jin Hyeok,Kim, Hyungsang,Im, Hyunsik Elsevier 2019 Materials letters Vol.241 No.-
<P><B>Abstract</B></P> <P>A copper phosphide (Cu<SUB>3</SUB>P) thin film is synthesized on a Ni foam using a one-step electrodeposition method at room temperature and annealed at 300 °C in Ar atmosphere. The Cu<SUB>3</SUB>P film is amorphous and has a flat morphology with surface voids. It works as an electrocatalyst for water oxidation in an alkaline 1 M KOH electrolyte. It exhibits excellent catalytic oxygen evolution reaction with an overpotential of 310 mV, Tafel slope of 88 mV/dec, and good stability over 20 h of operation at 10 mA/cm<SUP>2</SUP>. The excellent OER performance is due to its large electrochemically active surface area and low charge transfer resistance at the catalyst-electrolyte interface after the annealing.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amorphous copper phosphide OER catalyst is synthesized by one-step electrodeposition. </LI> <LI> A smooth morphology with surface void is obtained after annealing. </LI> <LI> An overpotential of 310 mV at 10 mA/cm<SUP>2</SUP> with a Tafel slope of 88 mV/dec is demonstrated. </LI> <LI> Excellent long-term electrochemical durability is observed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Design, optimization and evaluation of mesalamine matrix tablet for colon drug delivery system
Pravin Kondiba Pawar,Chinanshu Gautam 한국약제학회 2016 Journal of Pharmaceutical Investigation Vol.46 No.1
The aim of the present investigation was to develop and evaluate matrix tablet of mesalamine for colonic delivery by using Eudragit RSPO, RLPO and combination of both. The tablets were further coated with different concentration of pH-dependent methacrylic acid copolymers (Eudragit S100), by dip immerse method. The physicochemical parameters of all the formulations were found to be in compliance with the pharmacopoeial standards. The in vitro drug release study was conducted using sequential dissolution technique at pH 1.2 (0.1N) HCl, phosphate buffers pH 6.8 and 7.4, with or without rat cecal content mimicking different regions of gastro intestinal tract. The result demonstrated that the tablet containing Eudragit RLPO coated with Eudragit S100 (1 %) showed a release of 94.91 % for 24 h whereas in the presence of rat cecal content the drug release increases to about 98.55 % for 24 h. The uncoated tablets released the drug within 6 h. The in vitro release of selected formulation was compared with marketed formulation (Octasa MR). In vitro dissolution kinetics followed the Higuchi model via non-Fickian diffusion controlled release mechanism. The stability studies of tablets showed less degradation during accelerated and room temperature storage conditions. The enteric coated Eudragit S100 coated matrix of mesalamine showing promising site specific drug delivery in the colon region.
Pawar, Sambhaji M.,Pawar, Bharati S.,Babar, Pravin T.,Ahmed, Abu Talha Aqueel,Chavan, Harish S.,Jo, Yongcheol,Cho, Sangeun,Kim, Jongmin,Hou, Bo,Inamdar, Akbar I.,Cha, SeungNam,Kim, Jin Hyeok,Kim, Tae Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.470 No.-
<P><B>Abstract</B></P> <P>Efficient and low‐cost multifunctional electrodes play a key role in improving the performance of energy conversion and storage devices. In this study, ultrathin nanoporous CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets are synthesized on a nickel foam substrate using electrodeposition followed by air annealing. The CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet electrode exhibits a high specific capacitance of 1473 F g<SUP>─1</SUP> at 1 A g<SUP>─1</SUP> with a capacity retention of ∼93% after 5000 cycles in 3 M KOH solution. It also works well as an efficient oxygen evolution reaction electrocatalyst, demonstrating an overpotential of 260 mV at 20 mA cm<SUP>─2</SUP> with a Tafel slope of ∼64 mV dec<SUP>─1</SUP>. in 1 M KOH solution, which is the lowest reported among other copper-cobalt based transition metal oxide catalysts. The catalyst is very stable at >20 mA cm<SUP>─2</SUP> for more than 25 h. The superior electrochemical performance of the CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet electrode is due to the synergetic effect of the direct growth of 2D nanosheet structure and a large electrochemically active surface area associated with nanopores on the CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheet surface.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultrathin nanoporous CuCo<SUB>2</SUB>O<SUB>4</SUB> nanosheets electrode synthesized by electrodeposition. </LI> <LI> High specific capacitance and good cycling stability were obtained. </LI> <LI> Highly efficient OER electrocatalyst with an overpotential of 260 mV at 20 mA/cm<SUP>2</SUP>. </LI> <LI> Excellent long-term electrochemical durability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Pawar Pravin S.,Neerugatti KrishnaRao Eswar,Heo Jaeyeong 한국물리학회 2021 Current Applied Physics Vol.21 No.-
SnS is a layered material that crystallizes in an orthorhombic structure. This hinders the formation of a dense, pinhole-free morphology. The present study demonstrated the deposition of SnS thin films on soda-lime glass (SLG) and SLG/Mo substrates by spin-coating approach. The developed films were subsequently applied for the fabrication of a thin-film solar cell. The effect of the annealing temperature on the structural, optical, and morphological properties of the deposited SnS films was analyzed. The precursor concentrations and the annealing temperature played a critical role in determining the phase composition and morphological characteristics of the SnS thin films. TFSC with SLG/Mo/SnS/CdS/i-ZnO/AZO/Al configuration was fabricated using the optimal precursor ratio, i.e., Sn:S = 1:1.2, and this device showed a photoconversion efficiency of 0.076%. The reasons for the poor performance of the device were addressed in detail, and the scope for future research to optimize the device performance was elucidated.
Harshal Pawar,Chhaya Varkhade,Pravin Jadhav,Kavita Mehra 한국한의학연구원 2014 Integrative Medicine Research Vol.3 No.2
Background: Orodispersible tablets or fast dissolving tablets dissolve or disintegrate imme-diately on the patients’ tongue or buccal mucosa. This drug delivery system is suitable fordrugs undergoing high first pass metabolism. It improves bioavailability, reduces dosingfrequency, and thereby minimizes the side effects and also makes the dosage form morecost-effective. In this study, polysaccharide isolated from the seeds of Cassia tora was inves-tigated as a superdisintegrant in the orodispersible tablets. The model drug chosen wasvalsartan, an antihypertensive drug.Methods: Valsartan tablets were prepared separately using different concentrations (1%, 2.5%,5%, and 7.5% w/w) of isolated C. tora seed polysaccharide (natural) and sodium starch glyco-late (synthetic) as superdisintegrant by the direct compression method. Evaluation of tabletswas done for various pre- and postcompression parameters. The stability studies were per-formed on optimized formulation F4. The disintegration time and in vitro drug release of theformulation F4 were compared with marketed formulations (conventional tablets).Results: The drug excipient interactions were characterized by Fourier transform infraredstudies. The formulation F4 containing 7.5% polysaccharide showed good wetting timeand disintegration time as compared to a formulation prepared using a synthetic super-disintegrant at the same concentration level. Hence, batch F4 was considered optimizedformulation.Conclusion: The present work revealed that C. tora seed polysaccharide has a good potentialas a disintegrant in the formulation of orodispersible tablets. Because C. tora polysaccharideis inexpensive as compared to synthetic superdisintegrants, nontoxic, compatible, and easyto manufacture, it can be used in place of currently marketed superdisintegrants.
Effect of intrinsic ZnO thickness on the performance of SnS/CdS-based thin-film solar cells
Yadav Rahul Kumar,Pawar Pravin S.,Neerugatti KrishnaRao Eswar,Nandi Raju,조재유,허재영 한국물리학회 2021 Current Applied Physics Vol.31 No.-
Tin monosulfide (SnS) has promising properties as an absorber material for thin-film solar cells (TFSCs). SnS/ CdS-based TFSCs have the following device structure: SLG/Mo/SnS/CdS/i-ZnO/AZO/Al. The optimization of thickness of intrinsic zinc oxide (i-ZnO) for SnS-absorber layers and its impact on SnS/CdS heterojunction TFSCs has been investigated at different thicknesses ranging from 39 nm to 73 nm. With the increase in thickness of i- ZnO from 39 nm to 45 nm, the overall performance improved. The highest PCE of 3.50% (with VOC of 0.334 V, JSC of 18.9 mA cm 2, and FF of 55.5%) was observed for 45 nm-thick i-ZnO layers. Upon a further increase in the i-ZnO thickness to 73 nm, the device performance deteriorated, indicating that the optimum thickness of the i- ZnO is 45 nm. The device performances were analyzed comprehensively for different i-ZnO thicknesses.