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All Journal Jurnal Riset Kimia Communications in Science and Technology CHEESA: Chemical Engineering Research Articles
Rochliadi, Achmad
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Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Penentuan Resistivitas Tak-Terkompensasi Cairan Ion Berbasis Imidazol dengan Metode EIS: Pengaruh Panjang Alkil dan Perbedaan Anion Patah, Aep; Rachmawati, Yulia; Utari, Riyadini; Rochliadi, Achmad
Jurnal Riset Kimia Vol 11, No 2 (2020): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i2.359

Abstract

Ionic liquids have interesting properties because they have several advantages compared to conventional organic solvents, such as high thermal stability, high viscosity, good solvent properties, non-flammable, and non-volatile. In electrochemistry, ionic liquids can be used as solvents without the addition of electrolytes. However, ionic liquids still have resistivity properties (uncompensated resistance), thus ohmic drop measurements are needed for a potential correction. Imidazole-based ionic liquids, which are known for their high conductivity and commonly used as a solvent, have been measured of their resistivity as a function of temperature, and type of their cations/anions. Electrochemical Impedance Spectroscopy (EIS) method was chosen to measure the resistivity of ionic liquids and Bode plot was generated for the analysis of the results. The measured resistivities of ionic liquids are in the range of 420 to 1500 ohm. It is concluded that the resistivity of the imidazole-based ionic liquid is influenced by the size of their constituent ions, the viscosity, and the resistance is decreased with increasing temperature.
Pengaruh Variasi Dopan Asam Terhadap Kinerja Baterai Sekunder Polianilina|Zn Akbar, Said Ali; Suendo, Veinardi; Rochliadi, Achmad
CHEESA: Chemical Engineering Research Articles Vol. 3 No. 1 (2020)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.282 KB) | DOI: 10.25273/cheesa.v3i1.6702

Abstract

Studi tentang baterai sekunder polianilina(PAni)|Zn telah banyak dikembangkan, tetapi sejauh ini masih belum ada penjelasan mengenai pengaruh asam terhadap kinerja baterai tersebut. PAni disitensis menggunakan metoda elektrodeposisi dengan tegangan 0,7 V selama 30 menit. PAni hasil sintesis dikarakterisasi menggunakan Voltammetri dan Spektroskopi Inframerah. Baterai PAni|Zn didesain dalam bentuk sandwich, kemudian pengukuran kinerja digunakan impedansi serta pengisian-pengosongan. Baterai dengan elektroda PAni-Cl dan PAni-Br mempunyai kinerja yang lebih baik dengan specific capacity saat ke-60 yaitu 55,4 dan 37,4 mAh g-1. Pengukuran impedansi pada baterai dengan elektroda PAni-Cl, PAni-Br, dan PAni HClO4, menunjukan resistance solution (Rs) secara berurutan yaitu 1,38; 2,56; dan 3,03 W dan resistance charge transfer (Rct) 2,24; 2,97; dan 7,71 W. Oleh sebab itu, baterai PAni|Zn dengan dopan HCl menunjukkan kinerja terbaik dibanding dengan asam yang lain.
Conductivity and mechanical properties of PEO/PVA/UiO-66 composite polymers for membrane of lithium-ion batteries Patah, Aep; Rochliadi, Achmad; Husein, Aditya; Ramadhan, Dadang
Communications in Science and Technology Vol 9 No 2 (2024)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.9.2.2024.1515

Abstract

Lithium batteries are crucial for energy storage in electronics, transportation, and industrial sectors. However, lithium-ion battery separators such as Celgard require significant improvements, particularly in ionic conductivity (?). Combining Metal-Organic Frameworks (MOFs) with polymers is expected to create a separator membrane that enhances conductivity and mechanical properties in lithium-ion batteries. UiO-66 MOFs were synthesized using the solvothermal method at 120? and then composited with polyethylene oxide (PEO) and polyvinyl alcohol (PVA) polymer membranes using the solution casting method. The UiO-66 MOFs/PEO/PVA polymer composites were made by varying the UiO-66 content from 2% to 8% (w/w) while keeping a constant LiPF6 concentration of 9% (w/w). These composites were characterized using X-ray Diffraction (XRD) and Fourier-Transform Infrared spectroscopy (FTIR). Subsequently, the EIS test and tensile tests assessed the performance of the composite membranes. The resulting membrane with 6% (w/w) UiO-66 MOFs exhibited a conductivity (?) of 5.60 × 10–3 S cm–1 and a tensile strength of 32.5 MPa.
Co-Authors Aep Patah Husein, Aditya Ramadhan, Dadang Said Ali Akbar Utari, Riyadini Veinardi Suendo Yulia Rachmawati