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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan JURNAL PENDIDIKAN TAMBUSAI Sainstek : Jurnal Sains dan Teknologi REACTOR : Journal of Research On Chemistry And Engineering Journal of Natural Sciences CHEDS: Journal of Chemistry, Education, and Science Journal of Educational Sciences YASIN: Jurnal Pendidikan dan Sosial Budaya MASALIQ: Jurnal Pendidikan dan Sains Jurnal Teknik Terapan (J-TETA) Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) Molekul: Jurnal Ilmiah Kimia Jurnal Pendidikan MIPA 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
Religion Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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Development of REACT-Based E-Module to Improve Students' Scientific Literacy Ability in Buffer Solution Karmila, Aroma; Kurniawati, Desy; Hardeli, Hardeli; Nizar, Umar Kalmar
Jurnal Pendidikan MIPA Vol 23, No 2 (2022): Jurnal Pendidikan MIPA
Publisher : FKIP Universitas Lampung

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Abstract

The buffer solution e-module based on the REACT strategy (Relating, Experiencing, Applying, Collaborating, Transferring) has been developed and analysed for its validity and practicality levels to assist the learning process of students to train students' scientific literacy skills. This research belongs to the type of EDR (Educational Design). Research) with the Plomp model. The research tools used were interview forms, validity questionnaires, and practicality. This e-module has been verified by six expert reviews, and 9 students became research subjects in this development research. Data were analysed using Aikens'V formula, and practicality percentage. Analysis of the validity of the questionnaire data showed an Aikens' V average score of 0.89 (for construct validity). Analysis of the practicality questionnaire data showed an average score of 83% and 83% (for small groups and field practice tests). Data analysis shows that the e-module has a high level of validity and practicality. Therefore, it can be concluded that the buffer solution e-module teaching material based on the REACT strategy is valid and practical so that it is feasible to use it in learning to train students' scientific literacy skills. Keywords: e-module, REACT strategy, buffer solution, scientific literacy DOI: http://dx.doi.org/10.23960/jpmipa/v23i2.pp866-879
PENINGKATAN EFISIENSI SENSITIZED SOLAR CELL (DSSC) MENGGUNAKAN PELAPISAN TiO2 DOPING ZnO DENGAN ZAT WARNA POLI TANIN Destari, Mutya; Hardeli, Hardeli
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 2 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i2.8171

Abstract

Dye Sensitized olar Cell (DSSC) merupakan sel surya dengan bahan pewarna sebagai penyerap foton dari sinar matahari. Penelitian terkait DSSC masih terus mencari komponen DSSC yang menghasilkan efisiensi tinggi dengan biaya produksi terjangkau. Efisiensi DSSC dapat meningkat dengan semakin banyaknya cahaya yang diserap dan juga dipengaruhi oleh banyaknya ikatan rangkap terkonjugasi yang terbentuk. Maka pada penelitian ini digunakan metode doping pada pasta untuk memperkecil celah pita, yang mampu mempercepat elektron tereksitasi dari pita valensi ke pita konduksi. Celah pita ini akan meningkatkan jumlah cahaya yang diserap. Polimerisasi juga dilakukan pada zat warna yang bertujuan untuk meningkatkan ikatan rangkap terkonjugasi sehingga lebih banyak foton yang terserap dan lebih banyak elektron yang mengalir. Hasil penelitian ini dapat mereduksi bang gap dari 3,2 eV menjadi 2,94 eV dan memperoleh efisiensi sebesar 11,4%.
PENINGKATAN EFISIENSI DYE SENSITIZED SOLAR CELL (DSSC) MENGGUNAKAN POLI TANIN Umayya, Dian Regina; Hardeli, Hardeli
CHEDS: Journal of Chemistry, Education, and Science Vol 7, No 2 (2023)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v7i2.8183

Abstract

Dye Sensitized Solar Cell (DSSC) merupakan sel surya berbasis pewarna generasi ketiga yang mengubah energi foton menjadi energi listrik. Pada penelitian ini pewarna yang digunakan pada DSSC adalah pewarna tanin yang dipolimerisasi untuk meningkatkan efisiensi. Polimerisasi dipengaruhi oleh beberapa faktor yaitu konsentrasi monomer, konsentrasi inisiator dan volume pengikat silang. Polimerisasi pada penelitian ini memvariasikan inisiator yang digunakan yaitu 1%, 2%, 3%. DSSC dirakit menggunakan kaca ITO yang dilapisi TiO2 yang diendapkan secara elektro menggunakan ZnO. Tegangan dan hambatan diukur menggunakan multimeter digital. Efisiensi optimum pada variasi konsentrasi inisiator 2% adalah 8,29% untuk poli tanin dan celah pita akibat elektrodeposisi menurun dari 3,2 eV menjadi 2,95 eV.
SINTESIS DAN KARAKTERISASI MOLECULARLY IMPRINTED POLYMERS BERBASIS BUTIL AKRILAT SEBAGAI BAHAN PENYERAP KOLESTEROL Amanda, Vira; Hardeli, Hardeli
CHEDS: Journal of Chemistry, Education, and Science Vol 6, No 2 (2022)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v6i2.6081

Abstract

Molecularly Imprinted Polymers merupakan pembentukan situs pengenalan molekuler dalam polimer dengan melakukan sintesis adanya template target. Tujuan penelitian adalah untuk mengetahui karakterisasi, pengaruh jumlah kolesterol, pengaruh waktu penyerapan dan pengaruh pH larutan kolesterol. Metode yang digunakan dalam sintesis MIPs adalah metode photopolimerisasi menggunakan cahaya ultraviolet dan dialiri gas nitrogen secara kontinyu. MIPs yang diperoleh berbentuk  membrane padatan transparan dan dikarakterisasi menggunakan FTIR. Berdasarkan hasil spectrum FTIR menunjukkan bahwa MIPs ekstraksi  tidak ditemukan puncak serapan gugus OH dan MIPs reekstraksi ditemukan puncak serapan gugus OH pada daerah  3395 cm-1.Kolesterol yang diserap MIPs dianalisis menggunakan spektrofotometer UV-Vis dan dalam darah menggunakan easy touch. Berdasarkan hasil penelitian diperoleh membrane MIPs kolesterol dengan kondisi penyerapan maksimum jumlah kolesterol pada membrane MIPs sebanyak 0,015 gram, dengan waktu kontak 30 menit. Efisiensi serapan MIPs dalam darah sebesar 9,9 mg/g. Hal ini menunjukkan MIPs yang disintesis dapat menyerap kolesterol dengan baik dalam larutan dan darah.
Enhancing DSSC Performance through Metal-Doped TiO₂ and Poly-Tannin Dye: A Study on Bandgap Reduction and Photon Absorption Hardeli, Hardeli; Ade Putri, Anisa; Gusmar Lina, Resi; Feronika, Widi; Permatasari, Putri
Jurnal Teknik Terapan Vol. 4 No. 1 (2025): April
Publisher : P3M Politeknik Negeri Jember

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Abstract

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.
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

Abstract

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.
Dye-Sensitized Solar Cell (DSSC) with TiO2-Cu and Natural Pigmented Dye Hardeli, Hardeli; Sanjaya, Hary; Novita, Indri Panca; Luli, Rahmaneta; Yunita, Lasmi; Agdisti, Nurul Fadilah; Permatasari, Putri
Jurnal Riset Kimia Vol. 17 No. 1 (2026): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v17i1.821

Abstract

Dye-Sensitized Solar Cells (DSSC) are solar cells that use dye as a sensitizer. Titanium dioxide (TiO2) is a semiconductor that is frequently used in DSSC. However, the effectiveness of TiO2 can decrease due to electron and hole recombination. In this study, copper metal (Cu) was electrodeposited onto the TiO2 layer, where Cu plays a role in forming a barrier layer to reduce electron recombination. Anthocyanins are natural dyes with a broad light spectrum that can be used as a photon absorber in the DSSC. Anthocyanins in this study were extracted from red grape skin (Vitis Vinifera), jengkol skin (Pithecellobium jiringa), senduduk fruit (Melastoma malabathricum L), and mangosteen peel (Garcinia Mangostana L). To create a more stable organic dye, the dye is co-pigmented with salicylic acid. The XRD characterization of the layers revealed a diffraction pattern indicating the presence of anatase-phased and size reduction on TiO2-Cu layers. As a result, the DSSC performance increased. SEM-EDS analysis was performed to determine surface morphology and identify Cu metal. FTIR analysis of dyes revealed the presence of specific anthocyanin groups. The UV-Vis characterization revealed the effect of co-pigmentation on the dye absorption area. The highest DSSC performance with TiO2-Cu coating and co-pigmented dye was achieved in the DSSC by electrodepositing Cu on the TiO2 layer while using grape skin as a dye source.
Co-Authors Ade Putri, Anisa Afifah Novita Sri Lathifah Agdisti, Nurul Fadilah Al Hamdi, Fuad Amanda, Vira Angreni, Siska Anna Maulina Asrizal Aulia, Annisa Bahrizal Bahrizal Bali Yana Fitri Budhi Oktavia Darmanella Dian Eka Wati Destari, Mutya Desy Kurniawati Dwi Agustini, Dwi Dwi Finna Syolendra Dwi Putri, Vika Trisna Edi Nasra Elfiza, Rizma Ernica, Santri Yuli Feronika, Widi Fisyabilillah, Dea Frista, Nada Gusmar Lina, Resi Harahap, Riri Indah Nitami Hary Sanjaya Hijri, Fadhillah Ideal, Flami Luthfianisa Imelda, Fitria Indang Dewata Jayawarsa, A.A. Ketut Karmila, Aroma Khairanisa, Ayudia Lasmana, Oria Lufri Lufri Luli, Rahmaneta Meilan, Adinda Mohtar, Lilia Ellany Muhammad Farhan Nabilah, Hafizah Nizar, Umar Kalmar Nofriyanti, Desi Novita, Indri Panca Novita, Rani Pernadi, Niza Lian Putri Permatasari, Putri Putri, Ike Erlanda Putri, Tiara Dwi Putri, Yollanda Prissila Rahadian Zainul Rahmi, Fathaniah Raviqa Ratih Komala Dewi Retno Damayanti Riga, Riga Risty, Chika Mei Rizki, Suci Yulia Sabrina, Joya Sari*, Rona Taula Sherly Kasuma Warda Ningsih Sidiq, Aqil Marsya Subriadi, Hanifah Putri Indah Suryani, Okta Susanti, Melly Umayya, Dian Regina Yunita, Lasmi