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Chusnana Insyaf Yogiyanti
Universitas Negeri Malang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Optimation PAN/TiO2 Nanofiber Membrane as Separator for Symmetric Supercapacitor Nasikhudin, Nasikhudin; Agustina, Silvia Nurlaili; Diantoro, Markus; Yogihati, Chusnana Insjaf; Suryana, Risa; Alias, Yatimah Binti
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
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.2025.57.5.6

Abstract

Supercapacitor is one of the energy storage systems known for their high-power density, long cycle life, and good cycling stability. To improve supercapacitor performance, we used a polymer PAN composite titanium dioxide (TiO2) as the separator material. Nanofiber separator membranes of PAN/TiO₂ with various masses (0, 5, 10, 15, and 20 wt%) were successfully synthesized using the electrospinning technique. The addition of TiO2 for modified fiber, due to its high absorption rate for energy storage, increased electrolyte uptake and optimized supercapacitor performance. The morphology, functional groups, crystallinity, and thermal stability of the membranes were identified using scanning electron microscope (SEM), Fourier transform infra-red (FTIR), x-ray diffraction (XRD), and thermogravimetric analysis (TGA), respectively. It was found that the membrane with 15 wt% TiO2 exhibited a fiber diameter of 224.73 nm, pore size of 138.98 nm, the highest porosity of 66.50%, electrolyte uptake of 240%, and thermal stability up to 282°C, with a remaining mass of 3.94% after being tested at 1000°C. The electrochemical performance of the supercapacitors was measured using galvanostatic charge-discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The membrane containing 15 wt% TiO2 demonstrated optimum ionic conductivity of 4.4 x 10-4 S/cm, gravimetric capacitance of 57.770 F. g-1, and capacitance retention of 94.22% after 1000 test cycles.
Rasch Model Application: Identification of Students’ Conceptual Understanding of Static Fluid Khusaini, Khusaini; Azizah, Nur; Suwasono, Purbo; Yogihati, Chusnana Insjaf; Andriani, Aries Dewi
Jurnal Pendidikan Fisika Indonesia Vol. 21 No. 1 (2025)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v21i1.15023

Abstract

This research aimed to determine the level of student conceptual understanding of Static Fluid material using the Rasch Model. The study used a cross-sectional survey with a quantitative descriptive approach. The sample was invited using simple random sampling of as many as 50 students of class XI Science in Malang Regency. The research used 15 multiple-choice questions on the conceptual understanding of static fluids. Research data analysis used the Rasch Model, assisted by Ministep software version 4.8.2.0. Based on the results of data analysis, it was concluded that the average distribution of the ability to understand static fluid concepts was above the standard average difficulty of the questions. This is indicated by 34 out of 50 students falling into the high and medium ability categories, meaning that students' conceptual understanding of static fluid material is quite good. The results of this research also found that students' conceptual understanding in the sub-chapter of Archimedes' principle was relatively low, as evidenced by 13 students answering correctly the question of conceptual understanding in this sub-chapter. Meanwhile, students' conceptual understanding of the hydrostatic pressure sub-chapter is relatively high, as indicated by 47 students answering correctly the question of conceptual understanding in this sub-chapter. This research is beneficial in providing a clear picture of students' conceptual understanding of static fluid material, highlighting areas where students still face difficulties. Teachers can use this information to design appropriate teaching strategies. Additionally, applying the Rasch model in evaluating conceptual understanding can enrich the literature in physics education.
Pengembangan Film Tipis ZnO/SiO2/Si untuk Aplikasi Fototermoelektrik: Sintesis dan Karakterisasi Fibriyanti, Lia; Kurniawan , Robi; Yogihati, Chusnana Insjaf; Latifah, Eny
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12935

Abstract

Photothermoelectric (PTE) conversion integrates photothermal and thermoelectric effects, where light irradiation generates a temperature gradient that induces voltage through the Seebeck effect. This study examines the influence of annealing treatment on the structural, morphological, and optical properties of ZnO/SiO₂/Si thin films for PTE applications. ZnO films were synthesized on SiO₂/Si substrates modified via a hydrothermal process, with samples prepared under two conditions: without annealing and with annealing at 700, 1000, and 1100°C. X-ray diffraction (XRD) analysis showed that the unannealed sample had low crystallinity and small grain size, while annealed samples exhibited improved crystallinity and grain growth consistent with the wurtzite ZnO phase. Scanning electron microscopy (SEM-EDX) revealed that annealing transformed irregular, porous structures into more compact and uniform grains, with elemental composition approaching the stoichiometric Zn:O ratio. UV–Vis spectroscopy indicated that annealing broadened the absorption range (330–1100 nm) and reduced defect-related absorption. The enhanced crystallinity and optical absorption imply improved photothermal and thermoelectric potential. Overall, optimizing annealing temperature effectively enhances the light–heat–electricity conversion capability of ZnO/SiO₂/Si thin films for photothermoelectric device applications.
Co-Authors Abadi, M. Tommy Hasan Agustina, Silvia Nurlaili Ahmad Zulian Akhmad Al Ittikhad Alias, Yatimah Binti Amania, Sulfa Andriani, Aries Dewi Atsnaita Yasrina Dion Bahrudin, Azhar Eny Latifah, Eny Factirohmani, Angie Safitri Fajrin, Amiya Fibriyanti, Lia Grace Djan Imani Dyah Aulia Hans Ishmah Luthfiyah Ishmah Luthfiyah Joko Utomo Joko Utomo Kurniawan , Robi M. Alfian Mizar Markus Diantoro Nadiya Ayu Astarini Nandang Mufti Narariya, Almira Sifak Fauziah Nasikh Nora Anggraini Nur Azizah Nurwijayanti Purbo Suwasono Putri, Tiara Zakiyah Ramadhani, I Gusti Ayu Isnaini Fatha Ramadhani Reyza Arief Taqwa, Muhammad Risa Suryana Sefia Kharen Gilar Tiana Sembiring, Rinawati Siti Helmyati Yessi Affriyenni