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All Journal SMARTek MEKTEK Foristek Jurnal MEKANIKAL Journal of Mechanical Engineering Science and Technology Abditani : Jurnal Pengabdian Masyarakat JTAM ROTARY Jurnal Abmas Negeri (JAGRI)
Khairil Anwar
Program Studi Teknik Mesin, Fakultas Teknik, Universitas Tadulako, Palu, Indonesia
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Journal : Journal of Mechanical Engineering Science and Technology

 1 
Performance Enhancement of Dye Sensitized Solar Cell (DSSC) through TiO2/rGO Hybrid: Comprehensive Study on Synthesis and Characterization Hatib, Rustan; Anwar, Khairil; Magga, Ramang; Astak, Muh Anjas; Widhiyanuriyawan, Denny; Wardoyo, Wardoyo
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 1 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i12024p138

Abstract

The TiO2 film is immersed in a graphite oxide solution, preparing it for thermal reduction, which converts the graphite oxide to reduced graphene oxide (rGO). This process produces rGO hybrid TiO2 photoanodes for dye-sensitized solar cells (DSSC). rGO in the TiO2 structure prevents electron recombination and improves overall efficiency. The main advantage of this method is its ability to prevent loss of rGO during the sintering process, which is a common problem with other methods. The study investigated heating temperatures ranging between 300˚C, 350˚C, 400˚C, 450˚C, and 500˚C to determine optimal conditions. The presence of rGO in the photoanode structure was confirmed via X-ray diffraction and Fourier transform infrared spectroscopy analysis. JV (current-voltage density) measurements of DSSC based on TiO2/rGO photoanode revealed that the highest photoelectric conversion efficiency (0.1923%) was achieved at 400˚C, much higher than other temperature variations. The findings demonstrate the effectiveness of a simple low-temperature thermal reduction process in producing graphene suitable for semiconductor applications in DSSC. The RGO produced through this method not only improves energy conversion efficiency but also outperforms traditional graphite electrodes. By optimizing the thermal reduction process and fine-tuning the heating conditions, this study advances the practical application of graphene-based materials in solar cell technology. This method overcomes the loss of rGO during sintering, ensuring its beneficial properties are retained. Overall, this study shows that low-temperature thermal reduction is an efficient technique to improve DSSC performance through the incorporation of reduced graphene oxide.
Effect of Various Canopy Shapes on the Drag Coefficient of Pickup Trucks Anwar, Khairil; Fadly, Muhammad Syaiful; Hermanto, Muhammad Wahyu
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p203

Abstract

The aerodynamic performance of light commercial vehicles, such as the Suzuki Carry, plays a crucial role in their fuel economy and road stability. One typical add-on, a canopy, often changes that airflow and, as a result, alters the drag acting on the vehicle. In this study, three different canopy shapes, flat, curved, and triangular, were examined to understand how each one affects the drag coefficient (Cd). To investigate this, both wind tunnel trials and CFD runs were conducted to track the airflow and measure any changes in drag with greater detail. For reference, the exact vehicle without a canopy was used as the base for comparison. From what has been observed, it is clear that adding a canopy tends to increase drag compared to leaving the cargo bed open. Of the three shapes tested, the flat canopy proved to be the most effective in increasing Cd, especially at moderate speeds. At around 80 km/h, for example, it pushed drag up by just over 11.063%. On the other hand, the curved canopy yielded the best result, adding only about 2.071% at 60 km/h. Flow images from the CFD runs showed that the flat and triangular designs disrupted the airflow more significantly, resulting in greater flow separation and larger wakes behind the truck. In contrast, the curved canopy seemed to keep the air closer to the surface, leaving less turbulence in its wake.
Co-Authors Anggara, Moch Briand Astak, Muh Anjas Bakri Bakri Denny Widhiyanuriyawan Effendy Arif Heriyadi, Heriyadi Hermanto, Muhammad Wahyu Kennedy, Kennedy Leandis Leandis M Rusdi Mardjudo, Ahsan Muchsin Muchsin Muhammad Din Muhammad Sadat Hamzah Muhammad Syaiful Fadly Naharuddin Naharuddin Ramang Magga Rezki, Akbar Rustan Hatib Soso, Ardi Yefta Sri Chandrabakty Wahyu H. Piarah Wardoyo Wardoyo Yuli Asmi Rahman