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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan Sainstek : Jurnal Sains dan Teknologi REACTOR : Journal of Research On Chemistry And Engineering Journal of Natural Sciences Journal of Educational Sciences YASIN: Jurnal Pendidikan dan Sosial Budaya MASALIQ: Jurnal Pendidikan dan Sains Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) Molekul: Jurnal Ilmiah Kimia IJIS Edu : Indonesian Journal of Integrated Science Education

Hardeli Hardeli

Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Padang, Jl. Prof. Dr.Hamka, Padang

Author-ID : 275294

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Environmental Science Library & Information Science Materials Science & Nanotechnology Social Sciences Other

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PREPARASI DYE SENSITIZED SOLAR CELL (DSSC) MENGGUNAKAN EKSTRAK ANTOSIANIN UBI JALAR UNGU (Ipomoea batatas L.) Damayanti, Retno; Hardeli, Hardeli; Sanjaya, Hary
Sainstek : Jurnal Sains dan Teknologi Vol 6, No 2 (2014)
Publisher : IAIN Batusangkar

This study aims to determine the effect of the concentration of semi-solid electrolyte/polymer gel and determine the effect of the dye absorption technique on TiO2 paste the resulting DSSC efficiency. The results obtained by XRD characterization of TiO2 crystal phase is anatase and rutile TiO2 with a crystal size of 30.27 nm. Based of testing the light absorption of dye extract of purple sweet potato is known that the spectrum of the dye can absorb light at 533 nm wavelength maximum. The result of the conversion of sunlight into electrical energy obtained the highest value is at the highest PEG concentration at 0.1 M is 0,38% for TiO2 paste is mixed directly with the dye and 0,23% for TiO2 paste soaking in the dye for 24 hours using an electrolyte semi-solid/gel polymer with an area of 1 cm2.Key words: anthocyanin, DSSC, semi-solid electrolyte, FTIR, UV-Vis, XRD

PREPARASI DYE SENSITIZED SOLAR CEL MENGGUNAKAN EKSTRAK ANTOSIANIN KULIT BUAH MANGGIS (Garcinia Mangostana L) Maulina, Anna; Hardeli, Hardeli; Bahrizal, Bahrizal
Sainstek : Jurnal Sains dan Teknologi Vol 6, No 2 (2014)
Publisher : IAIN Batusangkar

This study aims to determine the effect of the concentration of semi-solid electrolyte/polymer gel and determine the effect of the dye absorption technique on TiO2 paste the resulting DSSC efficiency. The results obtained by XRD characterization of TiO2 crystal phase is anatase and rutile TiO2 with a crystal size of 30.27 nm. Based of testing the light absorption of dye extract of purple sweet potato is known that the spectrum of the dye can absorb light at 533 nm wavelength maximum. The result of the conversion of sunlight into electrical energy obtained the highest value is at the highest PEG concentration at 0.1 M is 0,38% for TiO2 paste is mixed directly with the dye and 0,23% for TiO2 paste soaking in the dye for 24 hours using an electrolyte semi-solid/gel polymer with an area of 1 cm2.Key words: Anthocyanin, DSSC, semi-solid electrolyte, FTIR, UV-Vis, XRD

Polimerisasi Emulsi Asam Tanat : Pengaruh Inisiator dan Surfaktan Terhadap Efisiensi Dye Sensitized Solar Cell (DSSC) Susanti, Melly; Hardeli, Hardeli
Periodic Vol 8, No 2 (2019): PERIODIC
Publisher : Jurusan Kimia FMIPA UNP

Dye sensitized solar cell (DSSC) are photoelectrochemical based solar cells that involve the transfer of electrical charges from one phase to another. This research was carried out aimed at making DSSC (Dye Sensitized Solar Cell), Knowing the value of the conversion of solar energy into electrical energy and determining the value of the resulting efficiency. In this research, TiO2 degusa P-25 is coated with ITO glass by conductive part through doctor blande technique. Photon absorbent substances in this study used dye from tanned acid which was polymerized results characterization with FTIR on dyes has a strong absorption band at 1050 nm wavefroms indicating the presence of ether functional groups. In addition, when the DSSC circuit is illuminated by a 24 watt UV lamp it will produce electrical properties such as resistance and voltage as measured by a digital multimeter. Variation of inisiator and surfactant can influence the efficiency of the DSSC prodyced the highest efficiency is produced at a concentration of 0,5 M inisiator and 16 grams of surfactant mass which is 7,145 %.

Pengaruh Suhu dan Konsentrasi Monomer Pada Polimerisasi Asam Tanat Sebagai Zat Warna Terhadap Efisiensi Dye Sensitized Solar Sel Agustini, Dwi; Hardeli, Hardeli
Periodic Vol 8, No 2 (2019): PERIODIC
Publisher : Jurusan Kimia FMIPA UNP

Dye Sensitized Solar Cell (DSSC) is a solar cell with a dye as an absorbent of photons from sunlight. Research related to DSSC is still ongoing to find DSSC components that produce high efficiency, but are easy and inexpensive to produce. Polymerization is a combined reaction of several monomers with certain rearrangements. The polymerized monomer is tannic acid which is an organic compound that has about 20 Ï€-Ï€ * bonds. The tannic acid produced is then used as a dye in the DSSC circuit. Assembled DSSCs are tested for voltage and resistance using a digital multimeter. The polymerized dyes were characterized using UV-Vis, FTIR. The results of the UV-Vis analysis showed that the batochromic shift occurred in the polymerized dye. The batochromic effect will cause more photons to be converted into electrical energy. The FTIR spectrum is used to confirm the formation of poly-tannic acid. The efficiency of DSSC with polymerized dyes was higher than that of non-polymerized dyes, which was 8.9%

Analisis Kebutuhan LKPD Berbasis Problem Based Learning pada Materi Struktur Atom untuk Kelas X Fase E SMA Nofriyanti, Desi; Hardeli, Hardeli
YASIN Vol 3 No 5 (2023): OKTOBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/yasin.v3i5.1982

Teaching materials play an important role in forming active and enjoyable learning. Therefore, the formation of teaching materials should be aligned with the learning model that will be used. This research aims to identify students' needs for problem based learning LKPD as teaching materials in learning activities. The method used in this research uses a descriptive method with a quantitative and qualitative approach. The data collection technique was through interviews with 2 chemistry teachers in Class X Phase E of SMA and distributing questionnaires to 55 students in Class X Phase E of SMA. The results of the interviews showed that teachers had never used problem based learning LKPD in learning activities. Apart from that, student learning outcomes are still low because students have difficulty understanding the learning material. The research results can be concluded that; 1) One of the teaching materials used by teachers in learning atomic structure is LKPD; 2) As many as 38% of students stated that the teaching materials used were not able to help them understand the material, as many as 95% of students were interested in using LKPD based on problem based learning; 3) Teaching materials in the form of LKPD based on problem based learning on atomic structure material need to be developed to support and maximize the learning process, as well as optimize learning activities.

Pengaruh Waktu Perendaman Zat Warna Poli Kuersetin terhadap Efisiensi Dye Sensitized Solar Cell (DSSC) Putri, Tiara Dwi; Hardeli, Hardeli
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.609

The demand for electricity in Indonesia will continue to increase. This condition requires an increase in electricity production capacity from new and renewable energy (NRE) sources. The rising demand for electrical energy leads to the depletion of non-renewable natural resources, driving the shift towards renewable resources such as solar energy. Solar energy can be converted into electrical energy known as solar cells. Third-generation solar cells, known as dye-sensitized solar cells (DSSCs), have the ability to generate electrical energy using organic materials. The objective of this research is to improve the efficiency of DSSCs by using polymerized dyes and doping the TiO2 semiconductor with the surfactant CTAB using the sonication method. This research was conducted to achieve optimum efficiency with variations in the dye immersion time in the polyquercetin solution, specifically 10, 20, 30, 40, and 50 minutes. Characterization using UV-DRS was performed to observe the band gap energy of the semiconductor. The results of the study showed that the DSSC tested for current and voltage with a digital multimeter yielded the lowest efficiency of 7.9% with a 10-minute immersion time and an optimum efficiency of 19.3% with a 30-minute immersion time.

Karakterisasi dan Pengaruh Waktu Polimerisasi terhadap Sifat Fisik dan Efisiensi Dye Sensitized Solar Cell (DSSC) Berbasis Poli Kuersetin Fisyabilillah, Dea; Hardeli, Hardeli
Journal of Natural Sciences Vol 5, No 2 (2024): Journal of Natural Sciences Juli
Publisher : Mahesa Research Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34007/jonas.v5i2.616

Dye-sensitized solar cells (DSSCs) are solar cells that use dye to absorb photons from sunlight, which are then converted into electrical energy. In this study, quercetin, a flavonoid dye, was polymerized to increase the number of conjugated bonds, thereby enhancing the efficiency of the DSSCs produced. The aim of this research is to determine how polymerization time of polyquercetin affects the energy conversion efficiency of the DSSCs. The polymerized quercetin was characterized using FTIR, density, and viscosity measurements. FTIR results indicated the presence of functional groups such as O-H phenol, C=O carbonyl, C=C aromatic, and C-O, confirming the occurrence of polymerization. The polymerized quercetin was measured with a multimeter, revealing an optimal efficiency of 19.5% at a polymerization time of 45 minutes. Density and viscosity tests provided a molecular weight of polyquercetin of 20,117.3804 g/mol, resulting in a degree of polymerization of 66.56 polyquercetin chains.

Application and Impact of Constructivism in Learning: A Tertiary Study Wati, Darmanella Dian Eka; Dewi, Ratih Komala; Lasmana, Oria; Lufri, Lufri; Asrizal, Asrizal; Hardeli, Hardeli
Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan Vol. 18, No. 5 : Al Qalam (September 2024)
Publisher : Sekolah Tinggi Ilmu Al-Qur'an (STIQ) Amuntai Kalimantan Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35931/aq.v18i5.3585

The application of constructivist theories in literature reviews, particularly at the tertiary level, remains largely unexplored. This study aims to identify relevant literature reviews, what are their methodological features, and what are their objectives and subject matter regarding the application and impact of constructivism in learning. The method used in this tertiary study is systematic review. The purpose of the systematic review in this tertiary study research is to provide a careful summary of all available secondary research (literature review) in answering the research questions. In this study, researchers collected journal articles from Google Scholar, Eric, Science Direct, and Scopus online published in the period of 2014 to 2023. Based on the results of the collection and selection of articles by the inclusion and exclusion criteria, 15 articles were obtained. The article consists of 6 types of reviews, from 9 countries published in 15 Scopus and Sinta indexed journals. The results of this review show that the application of constructivism is carried out in learning activities in multi-disciplines. The impact of the application of constructivism is to improve learning outcomes, academic achievement, learning attitudes, and the effectiveness of learning activities.

Analisa Beberapa Sifat Fisikokimia dari Minyak Goreng Kemasan Hasil Penggorengan dengan Lemak Sapi Rahmi, Fathaniah Raviqa; Hardeli, Hardeli; Nasra, Edi; Pernadi, Niza Lian; Sabrina, Joya; Farhan, Muhammad; Nizar, Umar Kalmar
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.125466

Palm oil is one of the vegetable oils with the highest concentration of contaminants compared to other oils. The main components of palm oil are triglycerides which account for more than 95% and other components such as monoglycerides, diglycerides, free fatty acids, phosphatides and sterols. Beef in 100 grams contains fewer calories (498 kj), total fat (2.8 g), unsaturated fat (0.448 g), saturated fat (1.149 g) and cholesterol (50 mg) than goat meat of the same size .The nutritional composition of beef includes 18.8 grams of protein, 66.0 grams of water and 14.0 grams of fat. The aim of this research is to determine the physicochemical properties of packaged cooking oil produced from frying beef fat at certain temperatures and times. The physicochemical properties of the oil determined include density, flow rate, acidity index and saponification index. Bimoli cooking oil resulting from the frying process has a density value of 0.9205 gr/ml, a flow rate of 2.949 ml/s, an acid number of 3.06939 mgKOH/gr and a saponification index of 16.71005 mgKOH/gr. The results of this research indicate that the results of testing the physicochemical properties of packaged cooking oil have better values compared to the results of testing beef tallow cooking oil.

Pengaruh Konsentrasi Monomer Terhadap Pembentukan Poli Kuersetin Sebagai Zat Warna pada Dye Sensitized Solar Cell Putri, Yollanda Prissila; Hardeli, Hardeli
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118555

Dye-Sensitized Solar Cell (DSSC) is a type of dye-based third-generation solar cell that functions as a photon absorber. Modifications were made to the quercetin dye to increase the double bonds, and the semiconductor used was done with TiO2 – ZnO doping. Doping can reduce the energy gap, thereby increasing the conductivity of TiO2. The TiO2 – ZnO layer was made by the doctor blade method on ITO glass and the dye was immersed in poly quercetin. The DSSC circuit is arranged to form a sandwich facing each other, between the working electrode and the counter electrode. DSSC efficiency can be tested from the results of resistance and voltage measurements on UV light with a power of 24 watt/m2 using a digital multimeter. The highest efficiency was produced at a monomer concentration of 2.5 grams of 9.4% from a long polymer chain.

Co-Authors Agdisti, Nurul Fadilah Angreni, Siska Anna Maulina Asrizal Aulia, Annisa Bahrizal Bahrizal Budhi Oktavia Darmanella Dian Eka Wati Desy Kurniawati Dwi Agustini, Dwi Dwi Finna Syolendra Dwi Putri, Vika Trisna Edi Nasra Elfiza, Rizma Ernica, Santri Yuli Fisyabilillah, Dea Fitri, Bali Yana Harahap, Riri Indah Nitami Hary Sanjaya Hijri, Fadhillah Ideal, Flami Luthfianisa Indang Dewata Jayawarsa, A.A. Ketut Khairanisa, Ayudia Lasmana, Oria Lufri Lufri Luli, Rahmaneta Mohtar, Lilia Ellany Muhammad Farhan Nabilah, Hafizah Nizar, Umar Kalmar Nofriyanti, Desi Novita, Indri Panca Pernadi, Niza Lian Putri Permatasari, Putri Putri, Tiara Dwi Putri, Yollanda Prissila Rahadian Zainul Rahmi, Fathaniah Raviqa Ratih Komala Dewi Retno Damayanti Risty, Chika Mei Rizki, Suci Yulia Sabrina, Joya Sari*, Rona Taula Sherly Kasuma Warda Ningsih Sidiq, Aqil Marsya Subriadi, Hanifah Putri Indah Susanti, Melly Yunita, Lasmi

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