Bifunctional sulfur-doped cobalt phosphide electrocatalyst outperforms all-noble-metal electrocatalysts in alkaline electrolyzer for overall water splitting

Anjum, Mohsin Ali Raza,Okyay, Mahmut Sait,Kim, Minkyung,Lee, Min Hee,Park, Noejung,Lee, Jae Sung Elsevier 2018 Nano energy Vol.53 No.-

<P><B>Abstract</B></P> <P>Sulfur-doped CoP (S:CoP) nanoparticles are synthesized as a noble metal-free electrocatalyst <I>via</I> a novel and eco-friendly thiourea-phosphate-assisted solvothermal route. When used as a bifunctional electrocatalyst for the hydrogen and oxygen evolution reactions from water splitting in an alkaline solution, the electrode exhibits excellent activity and stability outperforming noble mental-based Pt/C, IrO<SUB>2</SUB>, and reported non-noble metal-based electrocatalysts. Density functional theory calculations indicate that the excellent performance is attributable to the improved charge-transfer characteristics of the S:CoP nanoparticles owing to their modified electronic structure. It also increases the number of exposed active sites especially on the conductive substrates. A bifunctional S:CoP catalyst-based alkaline electrolyzer for overall water splitting exhibits a stable current density of 100 mA/cm<SUP>2</SUP> at an overvoltage of 0.55 V during a long-term operation; this performance is superior to that obtained from all-noble metal electrolyzer with a Pt/C cathode and an IrO<SUB>2</SUB> anode.</P> <P><B>Highlights</B></P> <P> <UL> <LI> S:CoP is synthesized by eco-friendly thiourea-phosphate-assisted solvothermal route. </LI> <LI> S:CoP/NF becomes an active and stable bifunctional water splitting electrocatalyst. </LI> <LI> S-doping improves charge transfer and increases density of active sites. </LI> <LI> An alkaline electrolyzer with bifunctional S:CoP outperforms all-noble-metal electrolyzer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The electronic properties of CoP are modulated by doping S into its structure through an environment-friendly thiourea-phosphate route, and produced S:CoP electrocatalysts efficiently catalyze both HER and OER in alkaline media.</P> <P>[DISPLAY OMISSION]</P>

Accident Detection and Classification using IoT Fusion-Enabled Framework with Machine Learning Classifiers

Ahmed Raza Mohsin,Maira Khalid,Jehad Ali,Byeong-hee Roh 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.2

Connection stiffness reduction analysis in steel bridge via deep CNN and modal experimental data

Hung V. Dang,Mohsin Raza,H. Tran-Ngoc,T. Bui-Tien,Huan X. Nguyen 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.4

This study devises a novel approach, namely quadruple 1D convolutional neural network, for detecting connection stiffness reduction in steel truss bridge structure using experimental and numerical modal data. The method is developed based on expertise in two domains: firstly, in Structural Health Monitoring, the mode shapes and its high-order derivatives, including second, third, and fourth derivatives, are accurate indicators in assessing damages. Secondly, in the Machine Learning literature, the deep convolutional neural networks are able to extract relevant features from input data, then perform classification tasks with high accuracy and reduced time complexity. The efficacy and effectiveness of the present method are supported through an extensive case study with the railway Nam O bridge. It delivers highly accurate results in assessing damage localization and damage severity for single as well as multiple damage scenarios. In addition, the robustness of this method is tested with the presence of white noise reflecting unavoidable uncertainties in signal processing and modeling in reality. The proposed approach is able to provide stable results with data corrupted by noise up to 10%.

Deep Graph Convolutional Network Approach for Traffic Flow Prediction

Maira Khalid,Ahmed Raza Mohsin,Jehad Ali,Byeong-hee Roh 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.2

Exploiting W. Ellison model for seawater communication at gigahertz frequencies based on world ocean atlas data

Tahir, Muhammad,Ali, Iftikhar,Yan, Piao,Jafri, Mohsin Raza,Jiang, Zexin,Di, Xiaoqiang Electronics and Telecommunications Research Instit 2020 ETRI Journal Vol.42 No.4

Electromagnetic (EM) waves used to send signals under seawater are normally restricted to low frequencies (f) because of sudden exponential increases of attenuation (𝛼) at higher f. The mathematics of EM wave propagation in seawater demonstrate dependence on relative permeability (𝜇_r), relative permittivity (𝜀_r), conductivity (𝜎), and f of transmission. Estimation of 𝜀_r and 𝜎 based on the W. Ellison interpolation model was performed for averaged real-time data of temperature (T) and salinity (S) from 1955 to 2012 for all oceans with 41 088 latitude/longitude points and 101 depth points up to 5500 m. Estimation of parameters such as real and imaginary parts of 𝜀_r, 𝜀_r', 𝜀_r", 𝜎, loss tangent (tan 𝛿), propagation velocity (V_p), phase constant (𝛽), and α contributes to absorption loss (L_a) for seawater channels carried out by using normal distribution fit in the 3 GHz-40 GHz f range. We also estimated total path loss (L_PL) in seawater for given transmission power P_t and antenna (dipole) gain. MATLAB is the simulation tool used for analysis.

Effect of Different Wavelengths on Superoxide Dismutase

Samina T. Yousuf Azeemi,S. Mohsin Raza,Masoom Yasinzai,Abdul Samad 사단법인약침학회 2009 Journal of Acupuncture & Meridian Studies Vol.2 No.3

Introduction: Superoxide dismutase (SOD) is one of the most important antioxidant enzymes present in all oxygen-metabolizing cells. This enzyme eliminates toxins from our body, so it is vital to understand its action and activity under the influence of different wavelengths. The effects of different wavelengths of light in the visible range on SOD activity were investigated. Methods: Enzyme samples were irradiated with five different wavelengths for chromotization. The absorbance values of the control and treated enzymes were subsequently measured. Results: A wavelength of 644 nm (red) showed the maximum increase in absorbance compared with all other color wavelengths used. Yellow showed least absorption. Conclusion: Red color wavelength actually provides additional energy to the enzyme and hence the activation energy is lowered, compared with untreated enzyme. Introduction: Superoxide dismutase (SOD) is one of the most important antioxidant enzymes present in all oxygen-metabolizing cells. This enzyme eliminates toxins from our body, so it is vital to understand its action and activity under the influence of different wavelengths. The effects of different wavelengths of light in the visible range on SOD activity were investigated. Methods: Enzyme samples were irradiated with five different wavelengths for chromotization. The absorbance values of the control and treated enzymes were subsequently measured. Results: A wavelength of 644 nm (red) showed the maximum increase in absorbance compared with all other color wavelengths used. Yellow showed least absorption. Conclusion: Red color wavelength actually provides additional energy to the enzyme and hence the activation energy is lowered, compared with untreated enzyme.

Colors as Catalysts in Enzymatic Reactions

Samina T. Yousuf Azeemi,Syed Mohsin Raza,Masoom Yasinzai 사단법인약침학회 2008 Journal of Acupuncture & Meridian Studies Vol.1 No.2

We studied the effects of visible range irradiation (in vitro) on the enzyme solutions (glucose oxidase, cholesterol oxidase + cholesterol esterase and lipase) in order to infer the changes produced in the human body after chromotherapy. The glucose oxidase showed enhanced activity to the color purple (464 nm), while the activity of the other enzymes, cholesterol esterase + cholesterol oxidase and lipase, increased when exposed to dark violet (400 nm). Purple is being used in conventional chromotherapy for diabetes, as supported by the experimental observation in which purple enhanced the activity of enzymes responsible for the oxidation of glucose. Specific wavelengths regulate living processes by acting as catalysts in enzyme activity, while some wavelengths may reduce enzyme activity. The irradiation of specific wavelengths effect enzymatic processes, which as a consequence, accelerated biochemical reactions. This particular frequency when provided to the enzymes (in vitro) lead to changes which may well be occurring in vivo. We studied the effects of visible range irradiation (in vitro) on the enzyme solutions (glucose oxidase, cholesterol oxidase + cholesterol esterase and lipase) in order to infer the changes produced in the human body after chromotherapy. The glucose oxidase showed enhanced activity to the color purple (464 nm), while the activity of the other enzymes, cholesterol esterase + cholesterol oxidase and lipase, increased when exposed to dark violet (400 nm). Purple is being used in conventional chromotherapy for diabetes, as supported by the experimental observation in which purple enhanced the activity of enzymes responsible for the oxidation of glucose. Specific wavelengths regulate living processes by acting as catalysts in enzyme activity, while some wavelengths may reduce enzyme activity. The irradiation of specific wavelengths effect enzymatic processes, which as a consequence, accelerated biochemical reactions. This particular frequency when provided to the enzymes (in vitro) lead to changes which may well be occurring in vivo.

LSTM을 활용한 서울시 공영 주차장 수요 예측 모델 설계

천송민(Song Min Cheon),Ahmed Raza Mohsin,김태윤(Tae-Yoon Kim),신원재(Wonjae Shin) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.6

Phenol removal and hydrogen production from water: Silver nanoparticles decorated on polyaniline wrapped zinc oxide nanorods

Asim Jilani,Mohammad Omaish Ansari,Ghani ur Rehman,Muhammad Bilal Shakoor,Syed Zajif Hussain,Mohd Hafiz Dzarfan Othman,Sajid Rashid Ahmad,Mohsin Raza Dustgeer,Ahmed Alshahrie 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

The toxic and carcinogenic organic compounds discharge from industries, contaminate the natural reservoirsof water and air which eventually pose a global threat not only to the aquatic life but also to thehumanity. Herein, ternary nanocomposites of silver-nanoparticle (AgNPs)-decorated on polyaniline(Pani)-wrapped zinc oxide nanorods (AgNPs@Pani/ZnO) were prepared via a facile approach. Thenanocomposite degraded 97.91% phenol with an optimized dosage and concentration of H2O2. Moreover, the apparent rate constant for phenol degradation was 3.69 times higher than for pure ZnOnanorods. The hydrogen production from AgNPs@Pani/ZnO was 1.58 and 2.74 times higher than Pani/ZnO and ZnO, respectively. The enhanced phenol degradation and hydrogen production is attributed tothe transfer of holes to the Pani, from which the electrons were transferred to the conduction band ofZnO and eventually to the conduction band of the AgNPs, where they accelerated the redox reactionsfor rapid photolysis of water and phenol. The concentration of the catalyst dosage affected the rate ofphenol degradation. Further, response surface methodology was also applied in order to design 13 setsof random experiments in which the catalyst dosage and degradation time were varied to predict thephenol degradation.