Effect Of Components And Pretreatment Methods On The Power Generation Of Direct Biomass Fuel Cell

As we all know,biomass is the most abundant renewable resource given to us by nature.As a clean energy source,it has become one of one of the alternative energy sources for sustainable development.Lignocellulose biomass come from a wide range of plants and crops include barley straw and corn eobs.The components mainly contain cellulose,lignin,and hemic el lu lose.Its efficient use can greatly alleviate the current energy and environmental crisis.In this paper,a direct air cathode fuel cell was constructed A series of lignocellulosic biomass were used as fuel to convert the chemical energy into electric energy directly through the cell.The effects of pretreatment conditions including physical and chemical treatment and biomass components on biomass power generation were discussed.Using barley straw(3%w/v)as raw material,the raw material granularity was controlled in five ranges:less than 100 mesh,80-100 mesh,60-80 mesh,40-60 mesh,and more than 40 mesh.The electrochemical performance was tested under the conditions of 5M NaOH and 0.02M MV It was found that the smaller the particle size of raw materials,the better the fuel cell power generation performance.The smaller the raw material particle size,the greater the degree of separation of each component,in which the smaller the mechanical action of cellulose,the lower the crystallinity.Which lead to an increase of the ability to dissolve and participate in reactions.In addition,ultraviolet light can improve the separation efficiency of charge and speed up the transfer rate of charge on the surface of the solution and electrode,which lead to the ultimate performance of the electrochemical performance of the fuel cell.The five raw materials of barley straw,bamboo,corn cob,sweet-scented osmanthus leaf,and poplar also showed different electrochemical performances under the fuel cell.The power performance of fuel cells using bamboo and barley straw as raw materials was superior to that of several other raw materials which have a relatively low cellulose content.Next,two types of biomass including bamboo and barley straw were used to control different levels of lignin under quantitative cellulose and hemicellulose conditions.Fuel cells were constructed under conditions of 5M NaOH and 0.02M MV When the lignin content of 27.90%dropped to 8.87%,both the liniting current density and the maximum power density have increased to nearly 2.5 times.The lower the lignin content in the biomass,the more favorable it is to generate electricity.Similarly,under the condition of quantifying cellulose and lignin,controlling the different content of hemicellulose,when the content was reduced from 17.48%to 6.48%,the limiting current density and the maximum power density were reduced by nearly 50%.Which instructed the presence of hemicellulose was beneficial to increasing the power generation performance of cellulose.Finally,the power generation performance of barley straw in four dissolution systems was explored,including 10 wt%LICl/DMAC,5 M NaOH,7 wt%NaOH/12 wt%Urea,and 65 wt%ZnCl2.The results showed that the barley straw had the best power generation performance under 65wt%ZnC12 system,and the electrochemical performance increased with the increase of MV concentration.When the MV concentration reached to 0.08M,the open-circuit voltage of the fuel cell reached to 556 mV,the limiting current density was 26200 mA/cm2 and produced a maximum power density of 2830 mW/cm2,which is nearly 40 times higher than that of cellulose-based microbial fuel cells,and greatly iaproves the performance of electricity generation.