Survey on a Rule Based System to Refine User Walls

The core problem in today’s Online Social Networks (OSNs) is to allocate users the authority to manage the messages posted on their private space to avert that unwanted content. The unwanted data may contain political, vulgar, non-neural etc. message filtering systems are designed for unstructured or semi-structured data, as opposed to database applications, which use very structured data. In this paper, we proposed a System with the flexible rules to filter the unwanted messages posted on user wall. After passing threshold value, the informing message is sent to that user. This allows users to customize the refining criteria to be applied to their walls, and a Machine Learning-based classifier automatically classifies the messages and labelling messages in support of content-based filtering

Electrochemical Investigations of Double Perovskite M₂NiMnO₆ (Where M = Eu, Gd, Tb) for High-Performance Oxygen Evolution Reaction

Double perovskites are known for their special structures which can be utilized as catalyst electrode materials for electrochemical water splitting to generate carbon-neutral hydrogen energy. In this work, we prepared lanthanide series metal-doped double perovskites at the M site such as M2NiMnO6 (where M = Eu, Gd, Tb) using the solid-state reaction method, and they were investigated for an oxygen evolution reaction (OER) study in an alkaline medium. It is revealed that the catalyst with a configuration of Tb2NiMnO6 has outstanding OER properties such as a low overpotential of 288 mV to achieve a current density of 10 mAcm−2, a lower Tafel slope of 38.76 mVdec−1, and a long cycling stability over 100 h of continuous operation. A-site doping causes an alteration in the oxidation or valence states of the NiMn cations, their porosity, and the oxygen vacancies. This is evidenced in terms of the Mn4+/Mn3+ ratio modifying electronic properties and the surface which facilitates the OER properties of the catalyst. This is discussed using electrochemical impedance spectroscopy (EIS) and electrochemical surface area (ECSA) of the catalysts. The proposed work is promising for the synthesis and utilization of future catalyst electrodes for high-performance electrochemical water splitting

Copper cobalt tin sulphide (Cu2CoSnS4) anodes synthesised using a chemical route for stable and efficient rechargeable lithium-ion batteries

In everyday life superior lithium-ion batteries (LIB) with fast charging ability have become a valuable asset. The LIB performance of anode composite copper cobalt tin sulphide (Cu2CoSnS4; CCTS) electrodes, which were fabricated using a simple and easy hydrothermal method, was investigated. The electrochemical charge storage performance of the CCTS anode demonstrated sustainability, high-rate capability and efficiency. The CCTS anode exhibited a first discharge capacity of 914.5 mAhg−1 and an average specific capacity of 198.7 mAhg−1 in consecutive cycles at a current density of 0.1 Ag−1. It had a capacity retention of ~62.0% and a coulombic efficiency of more than 83% after over 100 cycles, demonstrating its excellent cycling performance and reversibility. It can be an alternative anode to other established electrode materials for real battery applications

Cerium guided site-selective crystal disorder engineering of MIL-88B(Ni) frameworks for electrocatalysis offering high-performance water oxidation

Engineering the degree of crystallinity is an attractive route to expose unsaturated coordinative metal nodes that act as active electrocatalytic sites in metal-organic frameworks (MOFs). Herein, we develop a novel strategy to induce site-selective disordering of the crystalline structure of MIL88B(Ni) frameworks via Ce-doping, resulting crystalline/amorphous heterostructures. X-ray diffraction and electron microscopy analyses reveal that Ce-rich spherical regions in the framework are amorphous while Ce-deficient flat sheets are crystalline. Comparatively, an optimally Ce-doped MIL-88B(Ni)/NF(nickel foam) anode exhibits significantly lower overpotentials (eta) of 205, 290, 410 and 450 mV to drive the oxygen evolution reaction (OER) under current densities of 10, 100, 1000 and 2000 mAcm(-2), respectively with a superior kinetic of 46.09 mVdec(-1) and a larger turnover frequency (TOF@eta = 330 mV) of 0.36 s(-1). DFT calculations support the experimentally observed Ce3+ ion doping effect in inducing site-selective crystal disorder on MIL-88B(Ni) framework structure, and hence on the OER electrocatalytic activity enhancement. In addition to the remarkably high OER performance, the optimized Ce-doped MIL-88B(Ni)/NF anode exhibits superbly enhanced electrochemical durability over 146 h against industrially relevant high biases of up to 1000 mAcm(-2) in 1.0 M KOH solution, thus demonstrating that Ce-doped MIL88B (Ni)/NF is a highly promising industrially relevant high-performance anode material for electrocatalyzing the OER

Nanoflake NiMn Layered Double Hydroxide Coated on Porous Membrane-like Ni-Foam for Sustainable and Efficient Electrocatalytic Oxygen Evolution

Layered double hydroxides (LDHs) have gained vast importance as an electrocatalyst for water electrolysis to produce carbon-neutral and clean hydrogen energy. In this work, we demonstrated the fabrication of nano-flake-like NiMn LDH thin film electrodes onto porous membrane-like Ni-foam by using a simple and cost-effective electrodeposition method for oxygen evolution reaction (OER). Various Ni1-xMnx LDH (where x = 0.15, 0.25, 0.35, 0.50 and 0.75) thin film electrodes are utilized to achieve the optimal catalyst for an efficient and sustainable OER process. The various composition-dependent surface morphologies and porous-membrane-like structure provided the high electrochemical surface area along with abundant active sites facilitating the OER. The optimized catalyst referred to as Ni0.65Mn0.35 showed excellent OER properties with an ultralow overpotential of 253 mV at a current density of 50 mAcm−2, which outperforms other state-of-the art catalysts reported in the literature. The relatively low Tafel slope of 130 mV dec−1 indicates faster and more favorable reaction kinetics for OER. Moreover, Ni0.65Mn0.35 exhibits excellent durability over continuous operation of 20 h, indicating the great sustainability of the catalyst in an alkaline medium. This study provides knowledge for the fabrication and optimization of the OER catalyst electrode for water electrolysis

Proceedings of National Conference on Relevance of Engineering and Science for Environment and Society

This conference proceedings contains articles on the various research ideas of the academic community and practitioners presented at the National Conference on Relevance of Engineering and Science for Environment and Society (R{ES}2 2021). R{ES}2 2021 was organized by Shri Pandurang Pratishthan’s, Karmayogi Engineering College, Shelve, Pandharpur, India on July 25th, 2021. Conference Title: National Conference on Relevance of Engineering and Science for Environment and SocietyConference Acronym: R{ES}2 2021Conference Date: 25 July 2021Conference Location: Online (Virtual Mode)Conference Organizers: Shri Pandurang Pratishthan’s, Karmayogi Engineering College, Shelve, Pandharpur, India