Abstract: A plant microbial fuel cell includes a planting container, a plant, a cathode and an anode. The planting container has a culture medium therein, and a microbial population is in the culture medium. The plant is grown in the culture medium in the planting container. The cathode is disposed on a surface of the culture medium, and the anode is arranged in the culture medium close to roots of the plant. The anode includes a porous carbon material prepared from coffee grounds, and thus the overall cost of the plant microbial fuel cell may be greatly reduced, and the porous carbon material is easy to process and has high biocompatibility.

Abstract: A power generating device and a power supplying method thereof are provided. The power generating device includes a battery set, a charge storage device, a charger and a voltage converter. The battery set has microbial fuel cell and/or solar battery, and is configured to generate a supply voltage. The charger generates a charging voltage according to the supply voltage, and provides the charging voltage through a first resistor to charge the charge storage device. The voltage converter converts a storage voltage provided by the charge storage device to generate a driving voltage, and provides the driving voltage to drive a load.

Abstract: A biofuel cell includes a cathode, an anode, and a microbial community. At least one of the anode and the cathode contains a biochar prepared from a Trapa natans husk as an electrode material, and the anode is located in the microbial community. By using the biochar prepared from the Trapa natans husk as the electrode material, not only can the power density of the biofuel cell be increased, but the economic benefits of waste recycling can also be achieved.

Abstract: A biofuel cell includes a cathode, an anode, and a microbial community. At least one of the anode and the cathode contains a biochar prepared from a Trapa natans husk as an electrode material, and the anode is located in the microbial community. By using the biochar prepared from the Trapa natans husk as the electrode material, not only can the power density of the biofuel cell be increased, but the economic benefits of waste recycling can also be achieved.