Design of tin polyphosphate for hydrogen evolution reaction and supercapacitor applications

Kumar Aniket,Kim In-Ho,Mathur Lakshya,Kim Ho-Sung,송선주 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.6

With the ever-growing demand for clean and viable energy sources, the possibility and need to use a multifunctional energy system having integrated energy storage and conversion capacity has been intensified in current times. To fulfill this require-ment, a search for an active material having an efficient bifunctional capacity of both hydrogen evolution reaction (HER) and supercapacitor is an essential requirement. The metal polyphosphate with the advantage of abundance, environmental friendliness, low cost, and reliable activity make it an emerging class of novel material for the present research. Herein, for the first time, the comparison of the amorphous and crystalline form of tin polyphosphate-based electrode was assessed toward hydrogen evolution reaction and supercapacitor. Considering the synergistic influence of abundant tin polyphosphate and the three-dimension structure of nickel substrate, we unswervingly deposited well-defined hierarchical in-situ amor- phous SnP x O y and ex-situ crystalline SnP x O y over Ni foam using the one-step hydrothermal route. Impressively, amorphous O y /NF electrode required less over the potential of the only 100 mV with Tafel slope of 50 mV dec −1 to attain a current SnP x density of 10 mA  cm −2 in comparison to crystalline SnP x O y /NF electrode showing over the potential of the only 170 mV with Tafel slope of 80 mV dec −1 to attain the same current density in 1 M KOH. Additionally, we investigated this electrode in a supercapacitor and found that amorphous SnP x O y /NF delivers a good specific capacitance of 580 F  g −1 at a current density of 1 A  g −1 , greater rate capability, and cyclic stability. Hopefully, this study may demonstrate a promising technique for the preparation of ample, low-cost electrodes for future applications in both HER and supercapacitors applications.

Study of the Effect of Two Separate Tilt Angles of Laser Scanning Lines on the Microstructure and Mechanical Properties in Direct Metal Laser Sintered AlSi10Mg Alloy

Aniket Chakrabarty,Vivek Kumar Sahu,Anindya Das,Shreya Mukherjee,Nilesh Prakash Gurao,Pritam Chakraborty,Himadri Nandan Bar,Niloy Khutia 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1

The scanning strategy has a measurable impact on the grain size and growth direction of the produced parts in powder bedfusion. Tilting of the laser scan lines by 67° is a default procedure applicable to PBF machines for obtaining maximumvariability in the direction of melt pools. In this work, AlSi10Mg parts were produced through direct metal laser sinteringwith two diferent scanning strategies. In the frst strategy, the scanning lines were not tilted in between layers while in thesecond strategy, the scanning lines were tilted by 67°. The microstructures of the as-deposited alloys for the two strategieswere evaluated by state-of-art characterization methods like scanning electron microscopy, electron backscatter difraction(EBSD), X-ray computed tomography (X-ray CT), and X-ray difraction. Monotonic tensile tests were hence conducted inboth categories. Greater tensile strength was demonstrated by the specimens with no tilting of the scan lines while the specimens produced with a 67° tilt manifested greater elongation. Grain morphology characterized by EBSD studies suggestedan inhomogeneity in grain size for the specimens with no tilting of the scan lines. This had primarily attributed to the earlyfailure of the same. It was also found out that the preferred growth direction of grains in AlSi10Mg was hindered by tiltingthe scan lines by 67°. X-Ray CT studies and Kocks–Mecking Analysis explained the deformation and hardening behaviorof both the types in the view of porosity and structural defects.

A New Perspective to Stable Marriage Problem in Profit Maximization of Matrimonial Websites

( Aniket Bhatnagar ),( Varun Gambhir ),( Manish Kumar Thakur ) 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.4

For many years, matching in a bipartite graph has been widely used in various assignment problems, such as stable marriage problem (SMP). As an application of bipartite matching, the problem of stable marriage is defined over equally sized sets of men and women to identify a stable matching in which each person is assigned a partner of opposite gender according to their preferences. The classical SMP proposed by Gale and Shapley uses preference lists for each individual (men and women) which are infeasible in real world applications for a large populace of men and women such as matrimonial websites. In this paper, we have proposed an enhancement to the SMP by computing a weighted score for the users registered at matrimonial websites. The proposed enhancement has been formulated into profit maximization of matrimonial websites in terms of their ability to provide a suitable match for the users. The proposed formulation to maximize the profits of matrimonial websites leads to a combinatorial optimization problem. We have proposed greedy and genetic algorithm based approaches to solve the proposed optimization problem. We have shown that the proposed genetic algorithm based approaches outperform the existing Gale-Shapley algorithm on the dataset crawled from matrimonial websites.

A New Perspective to Stable Marriage Problem in Profit Maximization of Matrimonial Websites

Bhatnagar, Aniket,Gambhir, Varun,Thakur, Manish Kumar Korea Information Processing Society 2018 Journal of information processing systems Vol.14 No.4

For many years, matching in a bipartite graph has been widely used in various assignment problems, such as stable marriage problem (SMP). As an application of bipartite matching, the problem of stable marriage is defined over equally sized sets of men and women to identify a stable matching in which each person is assigned a partner of opposite gender according to their preferences. The classical SMP proposed by Gale and Shapley uses preference lists for each individual (men and women) which are infeasible in real world applications for a large populace of men and women such as matrimonial websites. In this paper, we have proposed an enhancement to the SMP by computing a weighted score for the users registered at matrimonial websites. The proposed enhancement has been formulated into profit maximization of matrimonial websites in terms of their ability to provide a suitable match for the users. The proposed formulation to maximize the profits of matrimonial websites leads to a combinatorial optimization problem. We have proposed greedy and genetic algorithm based approaches to solve the proposed optimization problem. We have shown that the proposed genetic algorithm based approaches outperform the existing Gale-Shapley algorithm on the dataset crawled from matrimonial websites.

Disturbed homocysteine metabolism is associated with cancer

Tauheed Hasan,Reetika Arora,Aniket Kumar Bansal,Reshmee Bhattacharya,Gurumayum Suraj Sharma,Laishram Rajendrakumar Singh 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-

Hyperhomocysteinemia/Homocysteinuria is characterized by an increased level of toxic homocysteine in the plasma. The plasma concentration of homocysteine is 5–15 μmol/L in healthy individuals, while in hyperhomocysteinemic patients, it can be as high as 500 μmol/L. While increased homocysteine levels can cause symptoms such as osteoporosis and eye lens dislocation, high homocysteine levels are most closely associated with cardiovascular complications. Recent advances have shown that increased plasma Hcy is also a fundamental cause of neurodegenerative diseases (including Alzheimer’s disease, Parkinson’s disease, and dementia), diabetes, Down syndrome, and megaloblastic anemia, among others. In recent years, increased plasma homocysteine has also been shown to be closely related to cancer. In this review, we discuss the relation between elevated plasma Hcy levels and cancer, and we conclude that disturbed homocysteine metabolism is associated with cancer. Future clinical perspectives are also discussed.

Supported Bimetallic AgSn Nanoparticle as an Efficient Photocatalyst for Degradation of Methylene Blue Dye

Lipeeka Rout,Prashanth Rengasamy,Basanti Ekka,Aniket Kumar,Priyabrat Dash 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.4

We report the synthesis of TiO2-supported monometallic Ag, Sn and bimetallic AgSn nanoparticle catalysts prepared using sol–gel method via a rational nanoparticle encapsulation route. The samples were thoroughly characterized by ultraviolet-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS) with image mapping and Brunauer–Emmett–Teller (BET) surface area analyzer. The supported bimetallic AgSn catalyst had the anatase structure, surface area of 50 m2 /g and 2.6 ± 0.6 nm particle size. The efficiency of the catalysts was evaluated on photodegradation of methylene blue (MB) dye under visible light. The photocatalytic activity of MB was significantly enhanced in the presence of bimetallic AgSn nanoparticles (NPs) as compared to individual metal nanoparticles. Reusability study of the photocatalyst showed that the catalyst can be reused upto 5 runs with minimal loss in activity. Kinetic study revealed that the degradation reaction follows a pseudo first-order pathway.

Transition metal oxide (Ni, Co, Fe)-tin oxide nanocomposite sensing electrodes for a mixed-potential based NO₂ sensor

Bhardwaj, Aman,Kim, In-ho,Hong, Jae-woon,Kumar, Aniket,Song, Sun-Ju Elsevier Sequoia 2019 Sensors and actuators. B Chemical Vol.284 No.-

<P><B>Abstract</B></P> <P>A mixed-potential based sensor utilizing transition metal oxide (Ni, Co, Fe)-tin oxide nanocomposite sensing electrodes are fabricated for the first time and investigated for the gas sensing performance towards the highly toxic nitrogen dioxide. The nanocomposites are synthesized by solvo-combustion route and characterized for the physical, gas sensing and electrochemical properties in a temperature range of 600–700 ℃. The sensor equipped with Fe<SUB>2</SUB>O<SUB>3</SUB>-SnO<SUB>2</SUB> (Fe:Sn = 2:1) nanocomposite sensing electrodes sintered at 1000 ℃ shows the maximum response of 60 mV towards 100 ppm NO<SUB>2</SUB> with a relatively fast response and recovery dynamics at an operating temperature of 650 ℃. The sensor also shows a linear dependence of response over the logarithm of NO<SUB>2</SUB> concentration with a sensitivity of ∼44 mV/decade. Additionally, the oxygen concentration dependence, cyclability and cross-sensitivity towards interfering gases are also investigated. Finally, the sensing mechanism and electrochemical activity of the sensing electrodes are studied using polarization curve measurement and electrochemical impedance spectroscopy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mixed-potential based sensor utilizing transition metal oxide (Ni, Co, Fe)-tin oxide nanocomposite sensing electrodes. </LI> <LI> Fe<SUB>2</SUB>O<SUB>3</SUB>-SnO<SUB>2</SUB> nanocomposite sensing electrode responded 60mV towards 100ppm NO<SUB>2</SUB> at 650 ℃. </LI> <LI> The sensitivity of the sensor was found to be 44 mV/dec. in 10-100 ppm NO<SUB>2</SUB> concentration. </LI> <LI> The sensor displayed a low oxygen conc. dependence, high selectivity and high cyclability. </LI> <LI> Sensing mechanism and key parameters determining the sensing performance are discussed in details. </LI> </UL> </P>