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All Journal RADIASI: Jurnal Berkala Pendidikan Fisika Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
Sari, Fitri Nur Indah
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Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Altering Coconut Shell Biomass to High-Ordered Graphitic Carbon with Nickel Catalyzation Kumila, Biaunik Niski; Adityaa, Farhan; Destyofrini, Fredina; Sari, Fitri Nur Indah; Pancorowati, Dhita Azzahra; Kusuma, Hamdan Hadi
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 13 No. 2 (2023)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v13n2.p119-131

Abstract

Graphite is a carbon-based material potentially utilized in numerous applications, such as electrodes for supercapacitors, lithium-ion batteries, and absorbers for water treatment. Biomass graphite is a beneficial candidate for low-cost yet valuable graphite. In this work, coconut shells, the abundant materials with high carbon contents, were successfully transformed into valuable coconut shell graphite (CSG) using metal catalytic graphitization with nickel as a catalyst at low-temperature conditions of ~1200 °C. Nickel concentration varied between 2 mmol, 3 mmol, and 5 mmol per gram of carbon. The samples were further examined using X-ray diffraction (XRD), Raman Spectroscopy, and Transmission Electron Microscope (TEM). The high graphitization degree of ~ 72 % was confirmed by X-ray diffraction analysis. That was further supported by the high-ordered stacking carbon layer that appeared in HR-TEM images. Meanwhile, Raman spectroscopy confirms that nickel impregnation diminished the structural defect of samples and increased the sp2-carbon bond indicated by its rise of IG/ID. The IG/ID values of CGS and CGS-Ni5mmol are 0.86 and 0.92, respectively.
Implementation of STEM-Based PjBL with Design Thinking Strategies to Improve Student’s Creative Thinking Skills on Global Warming Materials Sari, Fitri Nur Indah; Abdurrahman, Abdurrahman; Ertikanto, Chandra
Radiasi : Jurnal Berkala Pendidikan Fisika Vol. 19 No. 1 (2026)
Publisher : Universitas Muhammadiyah Purworejo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37729/radiasi.v19i1.5621

Abstract

This study aims to determine the effect of PjBL-STEM learning with design thinking strategies on students' creative thinking skills on global warming material. This research was conducted at public high school Pringsewu with a research design that is non-equivalent control group design. The research instrument used was a description test. Learning using PjBL-STEM with a design thinking strategy improves students' creative thinking skills, this is indicated by the average value of the experimental class N-gain of 0.6130 which is greater than the control class with an average value of 0.5051 N-gain which is in the moderate category. Based on this data, it shows that the creative thinking ability of students has a significant difference between the experimental class and the control class. This is also supported by the data from the Independent Sample t-test hypothesis test results obtained Sig value. 0.003, it can be decided that the application of PjBL- STEM with a design thinking strategy can improve students' creative thinking skills on global warming material.
Co-Authors Abdurahman Abdurrahman Adityaa, Farhan Chandra Ertikanto Destyofrini, Fredina Hadi Kusuma, Hamdan Kumila, Biaunik Niski Pancorowati, Dhita Azzahra