Garuda - Garba Rujukan Digital

p-Index From 2020 - 2025

1.633

P-Index

This Author published in this journals

All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Teknik Terapan (J-TETA) JURNAL MUARA PENDIDIKAN Entalpi Pendidikan Kimia

Hardeli Hardeli

Unknown Affiliation

Author-ID : 5345682

Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

Published : 8 Documents Claim Missing Document

Claim Missing Document

Articles

Pengaruh Agen Pengikat Silang dan Waktu Polimerisasi Poli Asam Tanat pada Efisiensi Dye Sensitized Solar Cell (DSSC) Yusnita Pitri Mayenti; Hardeli Hardeli; Hary Sanjaya; Sri Benti Etika
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 2 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Abstract— Dye sensitized solar cell (DSSC) is a device that can convert light energy into electrical energy. Research on the DSSC continues to look for DSSCs with high efficiency values. The efficiency of DSSC is influenced by many things, one of which is the ability of the dye to absorb light energy. The dye used in this research is poly tannic acid obtained from the polymerization process of tannic acid. This polymerization is carried out to improve the ability of the dye to absorb sunlight. TiO2 / Cu paste was made using the sol gel method and coated on ITO glass using the doctor blade method. The formed layer is immersed in dye while the counter electrode is made with a candle flame. The DSSC was assembled to form a sandwich structure and electrolyte was dropped on the two electrodes. DSSC measured the voltage generated with a multimeter. The results of the UV-Vis analysis on the polymerized dye showed a bathochromic shift and an increase in the absorbance value. The results of FTIR analysis on polymerized dyes appeared ether groups in the range 1050–1250cm-1. The presence of this ether group indicates the formation of tannic acid poly. The highest DSSC efficiency found with the polymerized dye was 7.69% with polymerization time of 14 hours and the volume of crosslinking agent (TMPGDE) 115µL.Keywords: DSSC, Polymerization, Tannic Acid, Poly Tannic Acid, Efficiency

Degradasi Methyl Orange Secara Fotosonolisis Menggunakan Katalis ZnO/TiO2 Nurhafizah Nurhafizah; Hary Sanjaya; Hardeli Hardeli; Yohandri Yohandri
Jurnal Periodic Jurusan Kimia UNP Vol 10, No 1 (2021): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Abstract— The textile industry in Indonesia is increasing as a result of which more waste is produced, one of which is dye waste. The resulting waste has an impact on the surrounding environment. To reduce the impact caused by the waste, there are several methods used, one of which is degradation using photosonolysis method. In this study, the degraded dye was methyl orange using a ZnO/TiO2 catalyst with the photosonolysis method. This study aims to determine the optimum time and optimum doping of TiO2 in degrading methyl orange. The percentage of degradation was obtained from the absorbance value measured using a UV-VIS spectrophotometer. The maximum wavelength measurement result of methyl orange obtained is 463 nm. The result showed that the optimum radiation time to degrade methyl orange was 75 minutes with a degradation percentage of 60,568%. On the effect of the concentration of the ZnO/TiO2 catalyst, the optimum degradation percent was 27,317% at a concentration of 10%. For catalyst analysis using UV-DRS, the band gap value of ZnO/TiO2 was 10 % was 3,17 eV.

Pengaruh Waktu Polimerisasi pada Pembentukan Poli Asam Humat Terhadap Efisiensi Dye Sensitized Solar Cell (DSSC) Nindya Marsha; Hardeli Hardeli
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Abstract— Dye Solar Cell (DSSC) is a solar cell that uses a dye as an absorber of photons from sunlight that will be converted into electrical energy. DSSC research continues in order to obtain DSSC components that will produce high efficiency, inexpensive and environmentally friendly. The number of π bonds in dyes affects the efficiency of DSSC, the more photons from absorbed sunlight will be converted into electrical energy. Polymerization is one of the methods used to increase π bonds in dyes. Polymerization is a combination of several monomers with repeated arrangements. The monomer used in this study is humic acid. Humic acid is an organic compound that has π bonds. Polymerization with humic acid will produce poly humic acid which is used for dyeing in DSSC. The assembled DSSC will be tested for resistance and voltage using a digital multimeter. The dyes will be characterized by UV-VIS and FTIR. UV-VIS test results showed a shift in the higher wavelength region and an increase in absorbance. FTIR characterization was performed to confirm the formation of poly humic acid which was characterized by the presence of formed ether / ester groups. The efficiency of DSSC using polymerized humic acid dye was obtained. The efficiency is higher than that of the humic acid dye which is not polymerized, ie an efficiency of 7,079%. Keywords— DSSC, Polymerization, Humic Acid, Poly Humic Acid.

Pengaruh Crosslinker Terhadap Pembentukan Poli Asam Humat yang digunakan sebagai Dye pada Sel Surya DSSC Kenanga Anzulmi; Hardeli Hardeli
Jurnal Periodic Jurusan Kimia UNP Vol 9, No 2 (2020): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Dye Solar Cell (DSSC) is a device capable of converting solar energy into electrical energy. DSSCs are solar cells that use natural dyes to absorb photons from solar energy. The dye used in this study was poly (humic acid) which was obtained from the polymerization of humic acid using TMPGDE as a crosslinker. Polymerization aims to increase the efficiency of the dye in absorbing photons so that the resulting efficiency is better. The ITO glass coated with TiO2 / Cu was made using the sol-gel method. DSSC is assembled to form a sandwich structure and DSSC efficiency is measured using a digital multimeter. UV-Vis analysis of polymerized dyes showed increased adsorption and batochromic shift from 219nm to 269nm - 301nm. The poly (humic acid) formed in the FTIR analysis was characterized by the presence of epoxy groups with peak characteristics of 808 cm-1798 cm-1 and 750 cm-1 and peaks of 1565 cm-1, 1375 cm-1 according to the ester. , carbonyl, and carboxylic acids due to the CH strain. Maximum efficiency of 7.5% at a crosslinker volume of 200 μL.

Practicality of E-module based on Discovery Learning on the Reaction Rate material equipped with a Virtual Laboratory for Class XI SMA Bundani Sakinah Alora; Hardeli Hardeli
Entalpi Pendidikan Kimia Vol 3 No 3 (2022)
Publisher : Universitas Negeri Padang

The 2013 curriculum is a rules that makes students more active both in learning and in technological development. Teaching materials are called practical if the practitioner has stated that they can be applied in the field. This study aims to reveal the practicality of discovery learning-based e-modules on the reaction rate material equipped with a virtual laboratory for class XI SMA. This type of research is Research and Development (R&D). The research method used is the Plomp development model. The research was conducted at SMAN 14 Padang. Data were analyzed by Aikens’V formula. The results obtained at the one to one evaluation stage show that the e-module uses clear letters, covers and attractive designs., the language used is easy to understand, coherent presentation of material, videos and animations can help students understand the material. The results of the analysis of the practicality value obtained 87%. This data is evidenced by the ability of students to answer e-module questions by 78,9%. Based on the data analysis, it was concluded that the discovery learing based e-module on the reaction rate material equipped with a virtual laboratory was declared practical.

Praktikalitas E-Modul Kesetimbangan Kimia Berbasis Discovery Learning dilengkapi Virtual Laboratory Sri Mulyani; Hardeli Hardeli
Entalpi Pendidikan Kimia Vol 3 No 4 (2022)
Publisher : Universitas Negeri Padang

The use of teaching materials that have been developed must have a practical category so that teaching materials can be used in the field. This study aims to determine the practicality of the Discovery Learning-Based Chemical Equilibrium E-Module equipped with a Virtual Laboratory. This research is a continuation of previous research, namely research and development research using the plomp development model. This research stage is in the prototyping stage, precisely in prototype III to the assessment stage. The place of this research is located at SMAN 14 Padang. Analysis of the data obtained using the Aiken'V formula. The one to one evaluation test showed that the e-module was interesting both in terms of cover and content, it was clear in the presentation of the material, the language used was easy to understand, the video display made the material easier to understand. Based on the data analyzed by the aiken V formula, in the small group stage a V value of 87,6% was obtained with high practicality, and in the field test stage a V value of 85,1% was obtained in the high category. This data can be proven by the ability of students to solve problems in module E of 78.86% with a very high category.

PERAN DALIHAN NA TOLU DALAM MENINGKATKAN PENDIDIKAN IPA PADA ETNOSAINS: PERSPEKTIF FILSAFAT Gunaria Siagian; Titis Wulandari; Lufri Lufri; Asrizai Asrizai; Hardeli Hardeli
Jurnal Muara Pendidikan Vol 8 No 1 (2023): Jurnal Muara Pendidikan, Vol 8 No 1, Juni 2023
Publisher : LPPM Universitas Muhammadiyah Muara Bungo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52060/mp.v8i1.1049

A very basic concept in the traditional Toba Batak kinship organization is the clan. Marga is a group of people who come from the same grandfather and follow the lineage from the father which is called patrilineal. Toba Batak customs are connected by a red thread that is tied in a kinship relationship "Dalihan natolu ". This study aims to analyze multidimensional science education in the ethnoscience of Dalihan Na Tolu in the perspective of ontology, epistemology, and axiology. This study is a literature study (library research) with data sources from previous research articles on topics related to science education, science concepts, ethnoscience, and Dalihan natolu .The literature review method is by searching for Discopus literature for the 2017-2022 year using keywords or the keywords Dalihan natolu . The stages of literature are carried out in a simple manner, namely: (1) Searching and presenting literature, (2) Literacy analysis process, (3) Article preparation. The stages of literature are carried out in a simple manner, namely: (1) Searching and presenting literature, (2) Literacy analysis process, (3) Article preparation. The results of the study show that (1) the nature of learning science can be classified into three dimensions, namely science as a product, science as a process, and science as an attitude; (2) Dalihan Na Tolu Dalihan Na Tolu is a philosophy that is an integral part of the life of the Toba Batak people (3) ethnoscience Dalihan Na Tolu contains the concept of kinship and can be integrated into the concept of science such as Biology, Mathematics and Physics (4) several learning models with an ethnoscience approach can improve conceptual understanding, science process skills, conservation attitudes, and students' creative thinking abilities.

Enhancing DSSC Performance through Metal-Doped TiO₂ and Poly-Tannin Dye: A Study on Bandgap Reduction and Photon Absorption Hardeli Hardeli; Anisa Ade Putri; Resi Gusmar Lina; Widi Feronika; Putri Permatasari
Jurnal Teknik Terapan Vol. 4 No. 1 (2025): April
Publisher : P3M Politeknik Negeri Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Dye-sensitized solar cells (DSSC) are a promising alternative to conventional solar cells by using dye molecules to absorb sunlight and facilitate energy conversion. In this study, tannins were used as the dye. Tannins can be polymerized into poly-tannins, which increases the amount of double bonds and therefore improves photon absorption. Furthermore, this study will also examine how metal doping affects the TiO₂ semiconductor to further enhance its performance. The selected dopants—Cu, Fe, and Ag—were tested for their capacity to change the bandgap and increase electron mobility. Experiments showed that metal doping lowered the bandgap of TiO₂, resulting in better electron excitation and charge transfer. Under optimum conditions, the combination of poly-tannin dye and TiO₂-Ag semiconductor resulted in the highest DSSC efficiency (9.18%). Based on this, it can be concluded that combining metal-doped TiO₂ with poly-tannin dyes can greatly improve DSSC performance.

Co-Authors Anisa Ade Putri Asrizai Asrizai Bundani Sakinah Alora Hary Sanjaya Kenanga Anzulmi Laksono Trisnantoro Lufri Lufri Nindya Marsha Nurhafizah Nurhafizah Putri Permatasari Resi Gusmar Lina Siagian, Gunaria Sri Benti Etika Titis Wulandari Widi Feronika Yohandri Yusnita Pitri Mayenti

Title

Found 8 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 8 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 8 Documents
Search