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All Journal Indonesian Journal of Chemistry Jurnal Sains Materi Indonesia
Pravitasari, Retna Deca
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Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Unrevealing the Impact of Annealing Condition on Catalytic Activity of PtNi Alloy Electrode Towards Oxygen Reduction Reaction Wardhani, Anindya Pramudya; Tanaya, Salwaa; Pravitasari, Retna Deca; Damisih, Damisih; Arti, Dewi Kusuma; Rahayu, Sri; Gumelar, Muhammad Didik; Fidiani, Elok
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99297

Abstract

Alloying platinum (Pt) with transition metals such as nickel (Ni) has been an effective approach for reducing Pt loading and enhancing catalytic activities towards the sluggish oxygen reduction reaction (ORR) on the cathode of proton exchange membrane fuel cell (PEMFC). In this work, we advance the fabrication of PtNi alloy electrodes through direct synthesis on the gas diffusion layer (GDL) utilizing wet chemical reduction methods. The catalytic activities and binding interaction between Pt and Ni are optimized through annealing PtNi electrodes at 200 °C under different gas flows of N2 and the mixture of H2/N2 at 5%/95%. The physical characterization using X-ray diffraction (XRD) analysis and scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX) show the significant effect of the annealing environment on the morphology and distribution of the PtNi alloy catalyst on the GDL surface. The optimized electrodes exhibited enhanced ORR mass activity, with values of 8.17 and 18.26 mA mg−1 for PtNi annealed with N2 and N2/H2, respectively, surpassing the benchmark Pt/C (5.25 mA mg−¹). These results underscore the critical role of the annealing environment in optimizing the catalytic performance of PtNi-based electrodes for PEMFC applications, offering insights into more efficient fuel cell technologies.
The Influence of Anodizing Electrolyte Concentration on Ni-P Deposition on Anodic Aluminum Oxide (AAO) Rizkia, Vika; Susanto, Iwan; Belyamin; Garjati, Vina Nanda; Hapsari, Ade Utami; Raharjo, Jarot; Damisih; Pravitasari, Retna Deca
Jurnal Sains Materi Indonesia Vol. 27 No. 1 (2025): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2025.9708

Abstract

Aluminum alloys suffer from deficiencies in surface performance due to insufficient resistance to corrosion and mechanical qualities in harsh environments. Therefore, it is crucial to apply a protective surface modification during the manufacturing process of the aluminum component. The electroless deposited Ni-P shows great potential as a protective coating due to its simple manufacturing process and outstanding performance. This study investigates the effect of oxalic acid concentration in the anodizing process on electroless Ni-P coating. In this study, Anodic Aluminum Oxide (AAO) is formed by an anodizing process on 0.3,0.5, and 0.7 oxalic acids prior to Ni-P electroless deposition. The resulting Ni-P layer has a nodular-like morphology with a size in the order of 0.5 m or less. Moreover, the AAO surface is covered by a thin and tightly formed layer of nickel particles. The EDX analysis shows the oxygen percentage falls by up to 70% after Ni deposition in all anodizing parameters, as compared to the anodized specimens alone. In addition, the nickel content gradually decreases as the concentration of oxalic acid increases from 0.3 M to 0.7 M.
Co-Authors Belyamin Damisih Damisih, Damisih Dewi Kusuma Arti Elok Fidiani Garjati, Vina Nanda Gumelar, Muhammad Didik Hapsari, Ade Utami Iwan Susanto Jarot Raharjo SRI RAHAYU Tanaya, Salwaa Vika Rizkia Wardhani, Anindya Pramudya