Microbial Fuel Cells (MFC) and Plant Microbial Fuel Cells (PMFC) are novel green energy nowadays. However, they face low power production efficiency. Besides device design, the most important is to improve the electrode materials. Therefore, this project utilizes agricultural waste as the raw material and synthesizes the porous carbon through the chemical activation. Then, the synthesized porous carbon is used as electrode materials for MFC and PMFC to improve the disadvantages of high cost and low power density. The synthesized porous activated carbon has the advantages of low cost and waste circulation. Moreover, it has the characteristics of high surface area and pore volume to have better microbial adhesion to improve electron conductivity and power generation in our device and finally develop low-cost sustainable energy.