Ditemukan 4 dokumen yang sesuai dengan query
Nofrijon Sofyan
"
Vanadium-doped LiFePO4/C
used as a cathode for a lithium ion battery has been successfully synthesized.
In this work, LiFePO4 was synthesized from LiOH, NH4H2PO4,
and FeSO4.7H2O at a stoichiometric amount. Vanadium was added in the
form of H4NO3V at concentration variations and 3 wt.%
carbon black. The characterization includes thermal analysis, X-ray
diffraction, electron microscopy, and electrical impedance spectroscopy. The
thermal analysis results showed that the LiFePO4 formation
temperature is 653.8?700.0°C. The X-ray
diffraction results showed an olivine structure with an orthorhombic space
group, whereas ...
"
2016
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Nofrijon Sofyan
"
Platinum is the most effective counter electrode for use in dye-sensitized solar cells (DSSC). However, as platinum is very expensive, its price impedes its broad use as a DSSC counter electrode. As an alternative, carbon has been used for this purpose. In this study, carbon has been successfully pyrolyzed from the precursors of table sugar and sucrose through a chemical process, i.e. the dehydration of the precursors with sulfate acid followed by a pyrolysis process, ...
"
Depok: Faculty of Engineering, Universitas Indonesia, 2018
UI-IJTECH 9:2 (2018)
Artikel Jurnal Universitas Indonesia Library
Nofrijon Sofyan
"
Vanadium-doped LiFePO4/C used as a cathode for a lithium ion battery has been successfully synthesized. In this work, LiFePO4 was synthesized from LiOH, NH4H2PO4, and FeSO4.7H2O at a stoichiometric amount. Vanadium was added in the form of H4NO3V at concentration variations and 3 wt.% carbon black. The characterization includes thermal analysis, X-ray diffraction, electron microscopy, and electrical impedance spectroscopy. The thermal analysis results showed that the LiFePO4 formation temperature is 653.8–700.0°C. The X-ray diffraction results ...
"
Depok: Faculty of Engineering, Universitas Indonesia, 2017
UI-IJTECH 7:8 (2016)
Artikel Jurnal Universitas Indonesia Library
Nofrijon Sofyan
"
Faced with ever-shrinking reserves of fossil-based energy, in addition to the damaging impacts of the use of fossil-based energy sources, such as the greenhouse effect and global warming, efforts are needed to find energy alternatives. Currently under development as an alternative source of renewable energy, utilizing solar energy as its source, is a device incorporating the dye-sensitized solar cell (DSSC), which works using the simple photosynthetic-electrochemical principle at the molecular level. In this type of ...
"
Depok: Faculty of Engineering, Universitas Indonesia, 2017
UI-IJTECH 8:7 (2017)
Artikel Jurnal Universitas Indonesia Library
