A microbial fuel cell based on cocklebur biochar stacked anode
A fuel cell and microorganism technology, applied in biochemical fuel cells, battery electrodes, circuits, etc., can solve the problems of unguaranteed anode electrical conductivity, insufficient contact between particles, and anode biofilm blockage, etc. Simple process and stable power generation performance
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Embodiment 1
[0017] (1) Preparation of the anode: wash Xanthium with deionized water ( figure 1 The middle part 1) is dried at 100°C, and the obtained cocklebur is placed in a tube furnace, and carbonized at 900°C for 3 hours under the protection of nitrogen; the carbonized cocklebur biochar (4.1g) collected and placed in a cylindrical cylinder woven with titanium mesh ( figure 1 Middle part 2, volume 45cm 3 ), the stacking is so tight that it cannot move freely, forming a stacked anode based on Xanthium biochar. It is particularly emphasized that Xanthium has a round or oval shape, with needles growing outward on the surface, and this special shape is maintained during the carbonization process ( figure 2 ). Under the scanning electron microscope, it can be seen that the surface of Xanthium biochar is rough, and the acupuncture on the surface has a hollow pore structure ( image 3 ), providing a growth space for electrogenic microorganisms. After forming a stacked anode, although th...
Embodiment 2
[0021] The difference between this example and Example 1 is that in the process of carbonizing cocklebur seeds to form cocklebur seeds biochar, the cocklebur seeds were kept carbonized at 700° C. for 5 hours under the protection of argon; the collector metal mesh was stainless steel mesh. Such as Figure 4 As shown in this example, when the microbial fuel cell is successfully started (15 days), the maximum output power reaches 0.60mW, and the maximum output power is 0.60mW after long-term operation for 150 days.
Embodiment 3
[0023] The difference between this embodiment and Example 1 is that the anode is made of commonly used granular wood activated carbon (31.9g, such as image 3 ) are stacked in a titanium mesh woven cylindrical tube, the anodes are packed tightly and have small voids inside, and are compared with Examples 1 and 2 as a control. Such as Figure 4 As shown in this example, when the microbial fuel cell is successfully started (15 days), the maximum output power reaches 0.61mW, and after long-term operation for 150 days, the maximum output power is 0.22mW.
[0024] By comparing the power generation performance of the stacked anode microbial fuel cell in Examples 1, 2, and 3, we can find out that when the microbial fuel cell starts to reach a steady state successfully ( Figure 4 ), three kinds of microbial fuel cells reach similar electricity production performance, and after microbial fuel cell operation 150 days, the electricity production performance of the microbial fuel cell i...
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