Article Per Year (5 Year)
p-Index From 2021 - 2026
0.61
P-Index
This Author published in this journals
All Journal Phenomenon : Jurnal Pendidikan MIPA Jurnal Kimia Riset Journal of Global Research Education
Hardeli
Unknown Affiliation
Chemistry Education Mathematics Physics Other

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Pengembangan LKPD Ikatan Kimia Berbasis Contextual Teaching and Learning untuk Fase F SMA/MA. Putri Rahayu, Nabila; Hardeli
Journal of Global Research Education Vol. 2 No. 1 (2024)
Publisher : Akademi Akuntansi Indonesia Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62194/25cd0502

Abstract

Tujuan dari penelitian ini adalah mengembangkan LKPD berbasis Contextual Teaching and Learning pada materi ikatan kimia yang valid dan praktis. Jenis penelitian Educational Design Research (EDR) dengan model pengembangan plomp digunakan dalam penelitian ini. Instrumen pengumpulan data mengguanakn lembar validasi dan lembar praktikalitas. Hasil penelitian pada uji validitas LKPD ikatan kimia berbasis contectual teaching and learning untuk fase F SMA/MA yang dikembangkan diperoleh rata-rata indeks Aiken’s V sebesar 0,91 berada pada kategori valid. Hasil uji praktikalitas guru untuk LKPD yang dikembangkan diperoleh persentase sebesar 94% dengan kategori sangat praktis. LKPD yang dikembangkan memperoleh nilai persentase praktikalitas sebesar 93% dengan kategori sangat praktis.
Tannin-Based Natural Dye for DSSC: Polymerization Strategies to Maximize Efficiency Hardeli; Ade Putri, Annisa; Gusmar Lina, Resi; Feronika, Widi; permatasari, Putri
Jurnal Kimia Riset Vol. 10 No. 1 (2025): June
Publisher : Universitas Airlangga, Campus C Mulyorejo, Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jkr.v10i1.70387

Abstract

Dye-sensitised solar cells (DSSCs) use dyes to absorb sunlight. Tannin is an eco-friendly natural dye alternative. However, the efficiency of tannin-based DSSCs is still low due to the limited number of conjugated double bonds. This study aims to improve the efficiency of DSSCs by polymerising tannin in two steps: Formaldehyde condensation under acidic conditions and glutaraldehyde crosslinking in alkaline medium. Parameter variations included initiator concentration (KOH vs. NaOH), crosslinking agent volume, polymerization time and temperature, and tannin monomer concentration. Characterization by FTIR and UV-Vis showed an increase in light absorption after polymerisation. The best results were obtained at 120°C, 2% NaOH initiator, 2.5 mL glutaraldehyde volume and 90 min reaction time, with DSSC efficiency reaching 9.18%, a fourfold increase compared to pure tannin (2.18%). This study shows that tannin polymerization significantly improves the efficiency of DSSCs, so it has the potential to be developed as a more efficient natural dye for photovoltaic applications.
Development of Discovery Learning-Based E-Module with Video Demonstration to Improve Students’ Conceptual Understanding on Reaction Rate and Chemical Equilibrium Hardeli; Sakinah Alora, Bundani; Mulyani, Sri; permatasari, Putri
Phenomenon : Jurnal Pendidikan MIPA Vol. 14 No. 2 (2024): Jurnal Pendidikan MIPA
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/phen.2024.14.2.25765

Abstract

Learning chemistry concepts such as reaction rate and chemical equilibrium often pose challenges for students due to their abstract nature and limited opportunities for laboratory practice. This research aims to determine the validity, practicality, and effectiveness of the discovery learning-based emodule with a video demonstration on high school students' reaction rate and chemical equilibrium subjects. The type of research carried out was education design research (EDR) with the Plomp development model. This research involved six chemistry lecturers of the Faculty of Mathematics and Natural Sciences and Faculty of Engineering Universitas Negeri Padang. Teachers and students at the high school level from several schools were also involved in this research. Questionnaires, observations, interviews, and post-test and pretest scores were used to retrieve data. Based on the results, it was known that the two e-modules were in the valid category with values of 0.866 and 0.892. Furthermore, both e-modules have practicality values of 0.85 and 0.84 from teachers, respectively, and 0.96 and 0.87 from students, putting them in the practical category. The effectiveness values of the two e-modules were 0.59 and 0.67, so they were categorized as quite effective. The effectiveness of the developed e-module was evaluated based on the improvement of students’ conceptual understanding in the cognitive domain.
Co-Authors Ade Putri, Annisa Feronika, Widi Gusmar Lina, Resi Putri Permatasari, Putri Putri Rahayu, Nabila Sakinah Alora, Bundani Sri Mulyani Wahyuni, Melysa Dwi