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All Journal Sodality: Jurnal Sosiologi Pedesaan Jurnal Rekayasa Proses International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Riset Kimia ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Rekayasa Proses Edulingua: Jurnal Linguistiks Terapan dan Pendidikan Bahasa Inggris JPPS (Jurnal Penelitian Pendidikan Sains) SEMAR Renjana Pendidikan Dasar International Journal of Science and Society (IJSOC) Makara Journal of Science Jurnal Natural Jurnal MIPA dan Pembelajarannya Molekul: Jurnal Ilmiah Kimia Prosiding Temu Ilmiah Nasional Guru International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Muara: Jurnal Manajemen Pelayaran Nasional Jurnal Rekayasa Proses
Fitria Rahmawati
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Sebelas Maret University
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Neuroscience Physics Social Sciences Other

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REACTION KINETICS OF Cu ELECTRO-DEPOSITION ON THE SURFACE OF TiO2/GRAPHITE Rahmawati, Fitria; Mawasthi, Wanodya Anggit; -, Patiha
Jurnal Riset Kimia Vol 8, No 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.228

Abstract

Research on the kinetics of electrode reaction during copper electro-deposition on the surface of TiO2/graphite has been conducted. The aims of this research are to determine the ratio of anodic reaction rate to cathodic reaction rate , the ratio of anodic rate constant to cathodic rate constant , the equilibrium constant when the reaction reach equilibrium condition and to study the polarization in the electro-deposition reaction. Copper was deposited electrochemically from CuSO4 solution at various concentration i.e. 0.1 M; 0.2 M; 0.3 M; 0.4 M; 0.5 M. In every 5 minutes during electro-deposition process, the pH changes in anode cell was recorded and the change of Cu2+ concentration was also analyzed by spectrophotometric method. The result shows that the reaction order of Cu2+ reduction is first order and the oxidation of H2O in anodic cell is zero order. The ratio of anodic rate constant to cathodic rate constant, is 4.589´10-3 ± 0.071´10‑3. It indicates that the reaction rate  in cathode is larger than the reaction rate in anode and it allowed polarization.  The electrochemical cell reached equilibrium after 25 minutes with the equilibrium constant is 8.188´10-10 ± 1.628´10-10.
PENGEMBANGAN PERANGKAT PEMBELAJARAN FISIKA MODEL INKUIRI TERBIMBING BERBANTUAN VIDEOSCRIBE PADA MATERI KALOR UNTUK MENINGKATKAN HASIL BELAJAR SISWA SMAN 1 KEDUNGWARU Rahmawati, Fitria; W.W, Soegimin; Kardi, Soeparman
JPPS (Jurnal Penelitian Pendidikan Sains) Vol 5, No 2 (2016)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpps.v5n2.p1039-1047

Abstract

The aim of this research is to develop physics learning material based on guided inquiry model completed video scribe at heat material to improve senior high school achievement. Development of Physics Learning Material is used Dick and Carey model, this research using one-group pretest-posttest design. Data were analyzed using descriptive analysis qualitatively and quantitatively. Validation results showed that learning material is feasible to be implemented, including: (a) lesson plan; (b) student worksheet; (c) student books; (d) evaluation instrument. The results of this research were analyzed and obtained: lesson plan was properly implemented, good student responses, all students interested in learning. Learning evaluation of knowledge, N-gain include knowledge aspect and critical thinking skills, showed high improvement. Concluded that, physics learning materials developed is feasible to implemented and it can improve the student achievement Penelitian ini bertujuan mengembangkan perangkat pembelajaran fisika berbasis model inkuiri terbimbing berbantuan videoscribe yang layak untuk meningkatkan hasil belajar siswa SMA pada materi kalor. Pengembangan perangkat pembelajaran menggunakan model Dick and Carey, perangkat pembelajaran diujicobakan pada sekelompok subjek dengan rancangan one group pretest-posttest design. Data yang diperoleh dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil validasi perangkat pembelajaran menunjukkan perangkat pembelajaran layak untuk diimplementasikan, meliputi: (a) RPP; (b) LKS; (c) Buku Ajar; (d) Media videoscribe; dan (e) Tes Hasil Belajar. RPP terlaksana dengan baik, dan siswa memberikan respon positif terhadap pembelajaran. N-Gain pada aspek pengetahuan dan keterampilan berpikir kritis menunjukkan peningkatan dengan kategori tinggi. Kesimpulan dari penelitian ini yakni perangkat pembelajaran yang dikembangkan layak diimplementasikan dan dapat meningkatkan hasil belajar siswa.
PENGEMBANGAN PERANGKAT PEMBELAJARAN FISIKA MODEL INKUIRI TERBIMBING BERBANTUAN VIDEOSCRIBE PADA MATERI KALOR UNTUK MENINGKATKAN HASIL BELAJAR SISWA SMAN 1 KEDUNGWARU Rahmawati, Fitria; W.W, Soegimin; Kardi, Soeparman
JPPS (Jurnal Penelitian Pendidikan Sains) Vol 5, No 2 (2016)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpps.v5n2.p1039-1047

Abstract

The aim of this research is to develop physics learning material based on guided inquiry model completed video scribe at heat material to improve senior high school achievement. Development of Physics Learning Material is used Dick and Carey model, this research using one-group pretest-posttest design. Data were analyzed using descriptive analysis qualitatively and quantitatively. Validation results showed that learning material is feasible to be implemented, including: (a) lesson plan; (b) student worksheet; (c) student books; (d) evaluation instrument. The results of this research were analyzed and obtained: lesson plan was properly implemented, good student responses, all students interested in learning. Learning evaluation of knowledge, N-gain include knowledge aspect and critical thinking skills, showed high improvement. Concluded that, physics learning materials developed is feasible to implemented and it can improve the student achievement Penelitian ini bertujuan mengembangkan perangkat pembelajaran fisika berbasis model inkuiri terbimbing berbantuan videoscribe yang layak untuk meningkatkan hasil belajar siswa SMA pada materi kalor. Pengembangan perangkat pembelajaran menggunakan model Dick and Carey, perangkat pembelajaran diujicobakan pada sekelompok subjek dengan rancangan one group pretest-posttest design. Data yang diperoleh dianalisis secara deskriptif kuantitatif dan kualitatif. Hasil validasi perangkat pembelajaran menunjukkan perangkat pembelajaran layak untuk diimplementasikan, meliputi: (a) RPP; (b) LKS; (c) Buku Ajar; (d) Media videoscribe; dan (e) Tes Hasil Belajar. RPP terlaksana dengan baik, dan siswa memberikan respon positif terhadap pembelajaran. N-Gain pada aspek pengetahuan dan keterampilan berpikir kritis menunjukkan peningkatan dengan kategori tinggi. Kesimpulan dari penelitian ini yakni perangkat pembelajaran yang dikembangkan layak diimplementasikan dan dapat meningkatkan hasil belajar siswa.
NaFePO4 Cathode Prepared from The Caustic Fusion of A Mix Ilmenite-Hematite Followed by Cyclic Voltammetry for Na Insertion Fitria Rahmawati; Dwi Aman Nur Romadhona; Syulfi Faiz
The Journal of Pure and Applied Chemistry Research Vol 9, No 2 (2020): Edition May-August 2020
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2020.009.02.527

Abstract

Research to prepare NaFePO4 cathode material from iron sand was conducted. The iron sand consists of ilmenite FeTiO3 and hematite Fe2O3. A caustic fusion method used to precipitate iron as Fe(OH)3 and it increased Fe content up to 94.71 %. Phosphate precipitation successfully produced trigonal FePO4 and monoclinic FePO4 comply with ICSD#412736 and ICSD#281079. The prepared-FePO4 was then used as a precursor for Na insertion by applying cyclic voltammetry mode within 2.0 – 4.0 V with 0.05 mVs-1 of the scan rate. It produced orthorhombic olivine NaFePO4 and a secondary phase of orthorhombic Na0.7FePO4. Impedance analysis at 20 Hz – 5 MHz found that the material provided a semicircle at 100 Hz peak point, indicating electrode-bulk interface with a resistance value of 1735W, comparable to the electrical conductivity of 5.36 x 10-6 Scm-1. Even though the conductivity value is quite lower than NaFePO4 prepared from a commercial FePO4 that has been conducted in our previous research, however the electrical conductivity still reliable for cathode.
REACTION KINETICS OF Cu ELECTRO-DEPOSITION ON THE SURFACE OF TiO2/GRAPHITE Fitria Rahmawati; Wanodya Anggit Mawasthi; Patiha -
Jurnal Riset Kimia Vol. 8 No. 2 (2015): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v8i2.228

Abstract

Research on the kinetics of electrode reaction during copper electro-deposition on the surface of TiO2/graphite has been conducted. The aims of this research are to determine the ratio of anodic reaction rate to cathodic reaction rate , the ratio of anodic rate constant to cathodic rate constant , the equilibrium constant when the reaction reach equilibrium condition and to study the polarization in the electro-deposition reaction. Copper was deposited electrochemically from CuSO4 solution at various concentration i.e. 0.1 M; 0.2 M; 0.3 M; 0.4 M; 0.5 M. In every 5 minutes during electro-deposition process, the pH changes in anode cell was recorded and the change of Cu2+ concentration was also analyzed by spectrophotometric method. The result shows that the reaction order of Cu2+ reduction is first order and the oxidation of H2O in anodic cell is zero order. The ratio of anodic rate constant to cathodic rate constant, is 4.589´10-3 ± 0.071´10‑3. It indicates that the reaction rate  in cathode is larger than the reaction rate in anode and it allowed polarization.  The electrochemical cell reached equilibrium after 25 minutes with the equilibrium constant is 8.188´10-10 ± 1.628´10-10.
Lithium Titanate (LTO) Synthesis Through Solid State Reaction and Its Performance for LiFePO4/LTO Battery Viona Natalia; Anggia Putri Gustami; Fitria Rahmawati; Witri Wahyu Lestari; Agus Purwanto
Journal of Mathematical and Fundamental Sciences Vol. 50 No. 3 (2018)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2018.50.3.5

Abstract

Lithium titanate, LTO, was synthesized by solid state reaction with Li2CO3 and TiO2 powder as precursors. The result was characterized to investigate its crystal structure, phase content, cell parameters, surface morphology, electrical conductivity and its performance as electrode in a lithium ion battery. XRD analysis with Le Bail refinement showed that the prepared materials consisted of 4 phases of Li4Ti5O12, Li2TiO3, anatase TiO2 and rutile TiO2. The surface morphology was still not homogeneous, with an average grain size of 0.533 ± 0.157 µm. When 1% LTO was mixed with graphite and used as anode of an LFP battery, it produced a specific capacity of 130.66 mAhg"‘1 with Coulombic efficiency of 94.2%. When the composition was 5% of the total anode powder, the specific capacity was 118.74 mAhg-1 and Coulombic efficiency was 92.72%.
Metal-Organic Frameworks Based on Zinc(II) and Benzene-1,3,5-Tricarboxylate Modified Graphite: Fabrication and Application as an Anode Material in Lithium-Ion Batteries Witri Wahyu Lestari; Wulan Cahya Inayah; Fitria Rahmawati; Larasati Larasati; Agus Purwanto
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 1 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.1.6

Abstract

This research was aimed at synthesizing metal-organic frameworks (MOFs) based on zinc(II) and a benzene-1,3,5-tricarboxylate (BTC) linker in combination with graphite as anode material in lithium-ion batteries. The MOFs were prepared using sonochemical and solvothermal methods, which led to different materials: [Zn3(BTC)2·12H2O] (MOF 1) and [Zn(BTC)·H2O·3DMF] (MOF 2). The produced materials were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric/differential thermal analysis (TG/DTA), and a battery analyzer. Refinement of the XRD data was performed using the Rietica and Le Bail method. Sharp and intense peaks indicated that the materials had a high degree of crystallinity. The morphology of the materials as analyzed by SEM was cubic, with an average crystal size of 8.377 ± 4.276 µm for MOF 1 and a larger size of 16.351 ± 3.683 µm for MOF 2. MOF 1 was thermally stable up to 378.7 °C while MOF 2 remained stable up to 341.8 °C, as demonstrated by thermogravimetric analysis. The employment of the synthesized materials as anode in a lithium ion battery was proved to yield higher specific capacity and cycle stability compared to those using a graphite anode. The lithium-ion battery with 5 wt% MOF 1 exhibited the highest performance with an efficiency of 97.28%, and charge and discharge specific capacities of 123.792 and 120.421 mAh/g, respectively.
SURFACE MODIFICATION OF SEMICONDUCTOR THIN FILM OF TiO2 ON GRAPHITE SUBSTRATE BY Cu-ELECTRODEPOSITION Fitria Rahmawati; Sayekti Wahyuningsih; Nurani Handayani
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1497.07 KB) | DOI: 10.22146/ijc.21587

Abstract

Surface modification of graphite/TiO2 has been done by mean of Cu electrodeposition. This research aims to study the effect of Cu electrodeposition on photocatalytic enhancing of TiO2. Electrodeposition has been done using CuSO4 0,4 M as the electrolyte at controlled current. The XRD pattern of modified TiO2 thin film on graphite substrate exhibited new peaks at 2θ= 43-44o and 2θ= 50-51o that have been identified as Cu with crystal cubic system, face-centered crystal lattice and crystallite size of 26-30 nm. CTABr still remains in the material as impurities. Meanwhile, based on morphological analysis, Cu particles are dissipated in the pore of thin film. Graphite/TiO2/Cu has higher photoconversion efficiency than graphite/TiO2.
SYNTHESIS OF THIN FILM OF TiO2 ON GRAPHITE SUBSTRATE BY CHEMICAL BATH DEPOSITION Fitria Rahmawati; Sayekti Wahyuningsih; Pamularsih A.W
Indonesian Journal of Chemistry Vol 6, No 2 (2006)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1068.652 KB) | DOI: 10.22146/ijc.21746

Abstract

Thin film of TiO2 on graphite substrat has been prepared by means of chemical bath deposition. Cetyltrimethylammonium Bromide served  as linking agent of synthesized TiO2 to graphite substrate.The optical microscope and Scanning Electron Microscope (SEM) indicate that surfactant concentration affects the pore morphology of thin film Surface Area Analysis (SAA) of thin film indicated that the pore of thin film included in mesopore category. The anatase phase of TiO2 quantity arised as the surfactant concentration increase, gave high efficiency of induced photon conversion to current efficiency (% IPCE).
The Effect Of Sulphur (S) Doping and K+ Adsorption To The Electronic Properties Of Graphene: A Study By DFTB Method Yuniawan Hidayat; Fitria Rahmawati; Eddy Heraldy; Khoirina Nugrahaningtyas; IF Nurcahyo
Jurnal Riset Kimia Vol. 13 No. 2 (2022): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i2.485

Abstract

A study on the effect of S doping and K+ adsorption to the electronic properties of graphene has been conducted by DFTB (Density Functional Tight Binding) calculation. The supercell of 40 x 40 x 1 configured from the 4x4x1 unit cell of graphene was optimized. The calculation shows that the Fermi level of graphene shifted from -4.67 eV into -3.57 eV after S doping. In addition, the S presence caused the formation of gap within the Dirac K of valence band and conduction band. Meanwhile, K+ charge distribution was dominantly occurred within the S-graphene than the graphene.
Co-Authors -, Patiha Abu Masykur Abu Masykur Agung T. Wijayanta Agung Tri Wijayanta AGUS PURWANTO Agustin Widyowati Alaih, Imam Shofid Andini W. Pratiwi Anggia Putri Gustami Arikasuci Fitonna Ridassepri Aryanthi, G. Ayu Aulia, Nabila Putri Bagus Swandito, Paulus Bintang Junita Siagian, Bintang Junita Byba Melda Suhita Chanif Mahdi Chintya Dewi, Chintya Dani G Syarif Dedi Rohendi Dhini A. Phasa Dian Irianti Dian Irianti Dian Maruto Widjonarko Dwi Aman Nur Romadhona Dwi Nugrahaningtyas, Khoirina Dyah Purwaningsih Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Eddy Heraldy Edi Pramono Fadlulloh, Zaki Firanda Larasati Gesyth Mutiara Hikhmah Al Ichsan Handaka, Muhammad F. A. Heliani, Kinkind Raras I F Nurcahyo I F Nurcahyo, I F I. F. Nurcahyo I.F. Nurcahyo IF Nurcahyo Imam Shofid Alaih Indah Rizki Fitriani, Indah Rizki Irvina M. Murni Irvinna Mutiara Murni Istiqomah, Ana Ulfa Ita Permadani Ivandini Tribidasari Anggraningrum Jin Miyawaki Jun Nakamura Kardi, Soeparman Karima Apriany Khoirina Dwi Nugrahaningtiyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Dwi Nugrahaningtyas Khoirina Nugrahaningtyas Kinkind Raras Heliani Koji Nakabayashi Larasati Larasati Lisa Agustina Nurlaila Mahsus, Mahsus Maisaroh, Ummi Mawasthi, Wanodya Anggit Moedjijono Moedjijono Mohamad Syafri Mudjijono Mudjijono Muhammad A. Munir Muhammad Farhan Muzayanha, Soraya U. N Ita Aryunani, N Ita Nilasary, Hanida Nugraheni, Putranty Widha Nur Aini NUR FADILAH Nurani Handayani Nurcahyo, I. F. Nurcahyo, I.F. Nursukatmo, Hartoto Oktaviano, Haryo S. Pamularsih A.W Paramartha, I Gusti Ayu Filia Patiha - Pranoto . Puspitasari, Noviana Putri, Denis Octareta Amelia Qurrotul'aini, Nisriina 'Abidah Raihan, Edo Ridwan, Qanita Rini Wulandari Rini Wulandari Rizki Nur Analita Rochmi I. Apriyani, Rochmi I. Rosalin, Azka W Saputri, Dini Deviana Sayekti Wahyuningsih Sayekti Wahyuningsih Sayekti Wahyuningsih Sentot B. Rahardjo, Sentot B. Septia K Arifah Shobikah, Nanik Shota Sato Sidiq Fathonah Siti Rondiyah Sofia, Iva Suciana Nur Cahyaningsih Syafira Nur Zalfa Syoni Soepriyanto Syulfi Faiz Taufiiq-Yap Yun Hin Trianingsih Eni Lestari Viona Natalia Viona Natalia W.W, Soegimin Wanodya Anggit Mawasthi Widiasih Wijayanta, Agung Tri Witri Wahyu Lestari Wulan Cahya Inayah Yuni, Prima Novia Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Yuniawan Hidayat Zalfa, Syafira Nur