Sulfonasi Nata De Coco untuk Aplikasi Sebagai Membran Sel Bahan Bakar
Direct Methanol Fuel Cell (DMFC) is one type of fuel cell that has the potential to be used in Indonesia. In DMFC, the membrane serves as the electrolyte. Nafion® is the membrane commonly used in fuel cells. However, it has a high price which induces many researches on alternative materials. In this...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/32202 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Direct Methanol Fuel Cell (DMFC) is one type of fuel cell that has the potential to be used in Indonesia. In DMFC, the membrane serves as the electrolyte. Nafion® is the membrane commonly used in fuel cells. However, it has a high price which induces many researches on alternative materials. In this work, a modification has been conducted towards nata de coco film and powder by sulfonation process. Concerning nata de coco films, the reaction has been conducted with microwave assistance using power variation of 240, 400, and 560 Watt and the codes of the resulting films are SF-30, SF-50 and SF-70, respectively. On the other hand, the nata de coco powder was reacted with the same procedure using only 560 watt microwave power. The product of this reaction was SS-70. Prior to sulfonation reaction, membranes were immersed in a mixture of chlorosulphonic acid and N,N-dimethylformamide (DMF) for 4 hours at 4oC. The resulting membranes were characterized by several methods, such as ion exchange capacity, proton conductivity, functional group analysis by FTIR, swelling index, methanol permeability, morphology analysis by Scanning Electron Microscopy (SEM) and surface sulfur content analysis by Energy Dispersive X-Ray Spectroscopy (EDS). Better conductivity measurement was carried out using 100 mV voltage. SEM-EDS analysis showed the presence of sulfur on the surface of SF-50 and SF-70 membranes, while on SF-30 surface the presence of sulfur could not be detected. From the comparison between the three types of synthesized membranes, it was found that SF-70 membrane was the best membrane to be used as electrolyte membranes in DMFC, with ion exchange capacity value of 1,231 mEq/g and conductivity value at 80oC (100mV) of 0,0120 S/cm. At the same condition, Nafion® conductivity was 0,2623 S/cm. In addition, SF-70 showed a membrane permeability to methanol of 3.18×10-6 cm2/s. |
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