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All Journal Edufisika: Jurnal Pendidikan Fisika Journal of Mechanical Engineering Science and Technology
Hartatiek, Hartatiek
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Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Effect of Thickness of Nanofiber Separator Membrane PAN/PVDF on Supercapacitor’s Performance Agustina, Silvia Nurlaili; Diantoro, Markus; Hartatiek, Hartatiek; Nasikhudin, Nasikhudin
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/um016v9i12025p228

Abstract

Separators in supercapacitors have an important role as intermediaries for ions that pass during the charge-discharge process and affect the performance of supercapacitors. Therefore, a comprehensive study is needed related to separator characteristics, including morphology, pore size, diameter, functional group, and electrochemical performance of separator membranes from PAN/PVDF composites. The separator membrane was synthesized using the electrospinning method with thickness variation (2, 4, 6, 8, and 10 layers), followed by supercapacitor fabrication with coin cell device. The resulting membrane was then characterized by Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FTIR). For the result of supercapacitor fabrication with coin cells, Galvanostatic Charge-Discharge (GCD), Cyclic Voltammetry (CV), and Electrochemical Impedance Spectroscopy (EIS) were carried out to determine supercapacitor performance. FTIR results showed that the PAN/PVDF membrane was successfully composites with the addition of new peaks identified as PVDF and PAN at wave numbers 2243.21 and 881 cm-1. The nanofibers formed have diameters ranging from 319.7 to 339.95 nm. The optimum percentage of electrolyte uptake is obtained at membranes that have 6 layers, which is 318.18% and decreases to 173.68% the thickness is 10 layers. In this study, the optimum supercapacitor performance was obtained in the 6 layers variation with a thickness of 75.91 x 103 nm with a gravimetric capacitance value is 53.36 F/g, the capacity retention is 88.96% after being tested for 500 cycles, the largest curve area of CV, and an ionic conductivity value is 54 x 10-5 S/cm.
POLA DAN KESENJANGAN INTEGRASI PBL, STEAM, DAN METACOGNITIVE PROMPTS TERHADAP BERPIKIR KRITIS SISWA Maharani, Novemia; Parno, Parno; Suwasono, Purbo; Hartatiek, Hartatiek
EduFisika: Jurnal Pendidikan Fisika Vol 11 No 2 (2026): EduFisika: Jurnal Pendidikan Fisika Volume 11 Nomor 2 August 2026
Publisher : Program Studi Pendidikan Fisika FKIP Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59052/bjvbrs47

Abstract

This systematic literature review maps and synthesizes empirical evidence on Problem Based Learning (PBL), STEAM/STEM, and metacognitive prompts in relation to students’ critical thinking skills. Guided by the PRISMA 2020 framework, studies were retrieved from Scopus and screened through identification, screening, eligibility, and inclusion stages, resulting in 31 empirical articles published between 2021 and 2025. The findings show an increasing publication trend peaking in 2024, with secondary-school contexts and quasi-experimental designs predominating. PBL was the most frequently represented component (64.5%), followed by STEAM/STEM (41.9%) and metacognitive strategies (12.9%). Most studies reported positive contributions to critical thinking through distinct mechanisms: PBL through problem-solving, STEAM/STEM through interdisciplinary learning, and metacognitive strategies through regulation of thinking processes. However, none of the 31 studies simultaneously integrated PBL, STEAM/STEM, and metacognitive prompts with critical thinking within a coherent learning design. This finding reveals a clear empirical gap and supports the development and validation of an integrated PBL–STEAM model supported by metacognitive prompts, particularly for secondary science and physics education.
Co-Authors Agustina, Silvia Nurlaili Maharani, Novemia Markus Diantoro Nasikh Parno Parno Purbo Suwasono