Browsing by Author "Saiful Islam"

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    Biphenyl monolayer construction with single transition metal doping as electrocatalysts for conversion CO2 to fuel
    (Elsevier, 2024-08-14) Rahadian Zainul; Ali B.M. Ali; Dheyaa J. Jasim; Alaa Dhari Jawad Al- Bayati; Irwanjot Kaur; Abhishek Kumar; Ibrahim Mahariq; Mohd Abul Hasan; Saiful Islam; Kareem, M.W.
    Developing sophisticated electrocatalysts is crucial in capturing chemically unreactive CO2 and transforming it into valuable products like fuel. This is essential for effectively tackling the issues of energy crisis and greenhouse gas emissions while maintaining considerable sustainability standards. Nevertheless, effectively managing the selectivity of products while maintaining a small overpotential remains a challenging task. Present work utilized density functional theory (DFT) for studying electrocatalytic potential of various single transition metals (TMs), such as cobalt, iron, and manganese, in process of carbon dioxide reduction reaction (CO2RR). Effectiveness of CO2RR was evaluated for each TM by analyzing their interaction with reaction intermediates (CHO, CO, and COOH) when incorporated into biphenyl monolayer (BPM) systems. Based on the analysis of ΔE values and barriers, it was determined that incorporating Fe into the biphenyl monolayer system is the most efficacious approach for the CO2RR to generate methane. This configuration achieves an exceptionally low overpotential potential (UL) of 􀀀 0.36 V. In hydrogen evolution reaction (HER), it was observed that CO2 exhibits a higher affinity for occupying the activation site on Fe-BPM compared to H2. This difference in adsorption energy (Ead) (􀀀 0.94 eV for CO2 vs. 􀀀 0.43 eV for H2) highlights their distinct behaviors. Additionally, Fe-BPM effectively suppresses the HER during the CO2RR process, as indicated by the HER’s UL of 􀀀 0.43 V. Findings of present study are anticipated to provide a novel direction in the advancement of electrocatalysts with low potential, while simultaneously exhibiting remarkable selectivity and activity for CO2RR.
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    Experimental investigation of double slope solar still integrated with PCM nanoadditives microencapsulated thermal energy storage
    (Elsevier, 2023-11-04) Lukmon Owolabi Afolabi; Christopher Chintua Enweremadu; Kareem, M.W.; Adiat I. Arogundade; Kashif Irshad; Saiful Islam; K.O. Oladosu; Abdulhafid M. Elfaghi; Djamal Hissein Didane
    Transparent covered slope solar stills are trending but characterised with low productivity, heat losses and high energy consumption, which are setbacks in practice. In this study, double slope solar still (DSSS) integrated with PCM-TES is presented. PCM was microencapsulated with epoxy resin composite using vacuum mould-filled techniques. Conventional DSSS and DSSS-TES data collected have been compared to establish the influence of TES on productivity. Daily average temperature of the glass cover, humid air, saline water, still basin absorber and TES cavity for the DSSS-TES attained are 65.2 ◦C, 77.5 ◦C, 82.4 ◦C, 79.5 ◦C and 68.4 ◦C, respectively. DSSSTES has yielded higher production, with 7.5 Litres of potable water daily and extension in operation period by 3 h has been achieved. In addition, condensation and evaporation rates increased with increase in production by 105%. Integration of TES with the system has reduced the heat losses while leakages from PCM nanocomposite have been prevented by microencapsulated insulator. No trace of metals, bacteria and organic contaminants has been found in desalinated water. A payback period of 0.8 year has been recorded based on all-year-round operations. Findings are in good agreement with existing models. Moreover, sensorial characteristics obtained conform to WHO standards.