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All Journal Mekanika: Majalah Ilmiah Mekanika Journal of Engineering and Technological Sciences
AlMohamadi, Hamad
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering

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Two-electron CO2 Reduction Reaction Mechanism on Nickel Cobalt Phosphate Surface Doped by Transition Metal: A DFT Study Primipara, Raka; Syaifullah, Dzaki Ahmad; Nuruzzahran, Muhammad Arkan; Wijayanti, Dyah Puspasari; AlMohamadi, Hamad; Mobarak, Nadhratun Naiim; Fathurrahman, Fadjar; Saputro, Adhitya Gandaryus
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.3

Abstract

In this study, we explore the activity and selectivity of the CO2 reduction reaction (CO2RR) to CO and HCOOH on pure and transition metal-doped NiCoPO(100) surfaces using density functional theory (DFT) calculations. The novelty of this work lies in demonstrating that substitutional doping with Mn, Fe, and Cu significantly alters the thermodynamic landscape of CO₂RR, particularly in enhancing selectivity toward HCOOH. While CO remains the dominant product on most surfaces, Mn-doped NiCoPO(100) uniquely reverses this trend by reducing the limiting potential for HCOOH formation to a value lower than that for CO production. Furthermore, Mn doping suppresses the competitive hydrogen evolution reaction (HER), steering the reaction pathway more selectively toward formic acid. These findings introduce Mn-doped NiCoPO as a promising and tunable catalyst platform for selective CO₂ to HCOOH conversion, providing valuable insights for designing efficient catalysts for sustainable carbon utilization.
Prospects and State of the Glass Industry in Saudi Arabia and a preliminary assessment of the quality of Glass and Glass-Ceramics Fabrication Mahmoud, Essam R. I.; Shaharoun, Awaluddin Mohamed; Aljabri, Abdulrahman; Almohamadi, Hamad; Farhan, Mohammed
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.64294

Abstract

The current study presents a feasibility study of the fabrication of ordinary glass and glass ceramics from Saudi Arabian domestic raw materials. It discussed the glass industry in Saudi Arabia and the middle east region. It also gives a brief explanation of the sand geography in Saudi Arabia. Also, it represents experimental data about the fabrication of ordinary glass and glass ceramics from Saudi raw materials. Firstly, ordinary transparent glass without significant defects was fabricated with sand collected from the Ar-Rays region in Saudi Arabia. Four nanosized crystallization catalysts, namely Vanadium Carbide (VC), Tungsten Carbide (WC), Titanium Carbide (TiC), and Titanium Oxide (T2O3,) were added to the constituents of the Glass in 3% wt. For VC, the crystallization process was limited. The glass ceramics of WC consisted of multi-dimensional edges crystals that covered all of the matrices. The addition of TiC obtained gray crystalline whiskers. The Y2O3-glass ceramics consisted of multi-directionally rosette crystals. Finally, the microhardness values of the added crystallization catalysts in glass ceramics were much higher than in ordinary glass.
Co-Authors Aljabri, Abdulrahman Farhan, Mohammed Fathurrahman, Fadjar Mahmoud, Essam R. I. Mobarak, Nadhratun Naiim Nuruzzahran, Muhammad Arkan Primipara, Raka Saputro, Adhitya Gandaryus Shaharoun, Awaluddin Mohamed Syaifullah, Dzaki Ahmad Wijayanti, Dyah Puspasari