The effect of impurities in black liquor-derived carbonaceous compound on direct carbon fuel cell performance

This project aims to investigate the effect of silica on the carbonecous compound derived from black liquor in two aspects: the characteristic of the biochar produced and the electrical performance in direct carbon fuel cell (DCFC)

In the pulping process in pulp and paper industry, alkaline solution is used to remove lignin from lignocellulosic biomass. This wastewater with high chemical oxygen demand (COD) is named as the black liquor. The carbonaceous compound consists of majority lignin content in black liquor can be recovered for various applications such as the fuel source in Direct Carbon Fuel Cell (DCFC). Previous research has found that a comparable electrical performance was obtained from coal and biochar derived from black liquor. The characterization of biochar from black liquor has shown that the presence of silica is significant and this might hamper the performance of DCFC. This study aims to investigate the effect of impurities such as silica in biochar on the performance of DCFC. The recovered carbonaceous compound from black liquor will be subjected to silica removal before it is pyrolyzed into biochar. Silica removal will be investigated in three different dosages of sodium carbonate (0.2M, 0.5M, 1M). The structural and physicochemical characteristic of biochar produced will be analysed by performing TGA, FTIR and FESEM-EDX analysis. The electrical performance of the biochar produced in DCFC will be investigated. Open circuit potential, maximum power density and electrical impendence will be computed. These results will be compared with untreated carbonaceous compound derived from black liquor and coal.

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