Papers by Rizka Ayu Yuniar
Jurnal Abdi Masyarakat Indonesia
Keterampilan presentasi karyawan ialah penting dimiliki oleh setiap karyawan di perusahaan atau i... more Keterampilan presentasi karyawan ialah penting dimiliki oleh setiap karyawan di perusahaan atau instansi manapun, termasuk para tenaga kependidikan (staf) di Institut Teknologi Kalimantan (ITK). Keterampilan presentasi karyawan merupakan suatu kebutuhan penting dalam meningkatkan kinerja karyawan dari setiap divisi atau bagian organisasi (perusahaan atau instansi). Presentasi digunakan untuk memberi rangkuman dari setiap aktivitas bisnis organisasi. Salah satu aplikasi yang digunakan untuk membuat materi dan menyajikan materi presentasi yang menarik ialah Canva. Canva merupakan aplikasi yang sangat diminati oleh kalangan praktisi atau karyawan dengan fitur yang terdiri dari berbagai template menarik sehingga hal ini dapat meningkatkan daya tarik para penyimak pada presentasi yang disampaikan oleh penyaji tersebut. Karyawan di Institut Teknologi Kalimantan hanya sekitar 30% yang dapat menggunakan aplikasi Canva. Hal ini yang menjadi dasar kegiatan pengabdian masyarakat berupa peningk...
Teknologi penyimpanan energi listrik telah banyak berkembang seiring meningkatnya kebutuhan manus... more Teknologi penyimpanan energi listrik telah banyak berkembang seiring meningkatnya kebutuhan manusia terhadap perangkat elektronik portabel dan berkembangnya kendaraan bertenaga listrik, salah satunya yaitu superkapasitor. Material yang sering digunakan untuk superkapasitor yaitu karbon aktif dan membutuhkan binder. Namun adanya binder mengurangi kinerja karbon aktif sebagai elektroda. Material alternatif yang dapat digunakan sebagai pengganti karbon aktif adalah carbon black. Salah satu jenis carbon black yaitu acetylene black (AB). AB telah banyak digunakan sebagai bahan tambahan aditif konduktif pada proses preparasi elektroda karena memiliki area spesifik yang luas dan low density. Poly (vinyl alcohol) (PVA) memiliki sifat fisis hidrofilik dan polimer semi kristalin. Beberapa keunggulan PVA seperti memiliki thermal stability yang baik, chemical resistance, properti fisik yang cukup baik dan sangat baik dalam biocompability. Berdasarkan hal tersebut, PVA sangat menarik untuk dikem...
Proceedings of the 1st International Conference on Industrial Technology, 2019
Electric energy storage technology has evolved along with the increasing of the human need for po... more Electric energy storage technology has evolved along with the increasing of the human need for portable electronic devices and the development of electric-powered vehicles, one of which is capacitors. Material that is often used for capacitors is activated Carbon and requires a binder, but the binder reduces the performance of activated carbon as an electrode. An alternative material that can be used as a substitute for activated Carbon is carbon black. One type of carbon black is acetylene black (AB). AB has been widely used as an additive for conductive additives in the electrode preparation process because it has a large and low-density specific area. Poly (vinyl alcohol) (PVA) has the physical properties of hydrophilic and semi-crystalline polymers. Some of the advantages of PVA are having good thermal stability, chemical resistance, good physical property, and excellent biocompatibility. Based on this, PVA is very interesting to be developed as an electroactive composite matrix...
3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019), 2020
Many types of research related to battery currently being developed to answer the increasing need... more Many types of research related to battery currently being developed to answer the increasing need for energy. One of the most exciting topics is about a metal-air battery that has low oxygen reduction reaction (ORR) in the cathode side as main problem. This research used a composite between MnO2 and carbon to increase the oxygen reduction reaction. MnO2 was synthesized from KMnO4 solution through electrochemistry method using multi-electrode at various temperatures. Carbon was synthesized from coconut charcoal through calcination and modified hummer method. Furthermore, The composite of MnO2/carbon was carried out using physical treatment. Sample analysis consists of characterization and electrocatalytic analysis. The characterization itself consists of morphological analysis using Scanning Electron Microscopy (SEM), and particle surface area analysis using Brunauer Emmet Teller (BET). While the electrocatalyst consists of Cyclic Voltammetry (CV) analysis to determine the occurrence of oxygen reduction reaction (ORR), and Linear Sweep Voltammetry (LSV) to determine the amount of electron transfer. According to the X-Ray Diffraction pattern and specific surface area, a higher temperature of potassium permanganate electrolysis indicated the lower performance of MnO2 produced. Also, after composited with carbon, the electrocatalytic analysis showed that both samples could initiate the oxygen reduction reaction with the number of electrons transferred are 1.52 for MnO2 30°C-Graphene and 2.28 for MnO2 60°C-Graphene which conclude that MnO2-carbon composite is quite promising to be researched further as electrocatalyst in the metal-air battery.
IOP Conference Series: Materials Science and Engineering, 2019
Carbon fibres are important materials due to their excellent properties. Carbon fibres were forme... more Carbon fibres are important materials due to their excellent properties. Carbon fibres were formed by blending Poly(vinyl alcohol) (PVA) and a high conductivity material of Acetylene black (AB). Electrospinning technique was used to fabricate PVA and AB solutions in demineralized water. Electrospinning is an efficient technique for the formation of polymer nanofibers. The effects of solution concentration and AB contents on morphological appearance and diameter of those as-spun fibres were investigated by scanning electron microscopy (SEM). Iodine treatment on the fabricated PVA/AB composite was successfully achieved in order to build up the carbonization process and retained their original fibrous structure. The mass of iodinated nanofibers at 80 °C for 24 h increased about 130 %. The mechanism of iodine uptake by electrospun PVA/AB fibres have been obtained by thermal behaviour and its morphological characteristics. It was found that iodine treatment played an important role in ch...
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Papers by Rizka Ayu Yuniar