Effect of Ammonia Treated Carbon Felt Anode on Performance of Marine Sediment Microbial Fuel Cell
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摘要: 选取500℃、650℃、800℃对石墨碳毡阳极进行氨气处理, 分别构建海底沉积物微生物燃料电池 (MSMFCs) 。结果表明:改性后其微生物活性和电化学活性均明显提高。500℃改性阳极表面微生物数量 (10.420×1011 cfu/m2) 是Blank组的2.9倍, 说明500℃氨气改性增加了微生物的附着量。500℃改性阳极循环伏安电容性能 (62.1 F/m2) 是Blank组的2.0倍, 表明其氧化还原电化学活性显著提高;电荷转移电阻 (14.46Ω) 为Blank组 (62.39Ω) 的1/4, 交换电流密度是Blank组的1.1倍, 说明500℃氨气处理提高了阳极的电子转移动力学活性和抗极化能力。500℃改性阳极的输出功率 (60.67 mW/m2) 为Blank组 (29.17 mW/m2) 的2.1倍, 其长期输出电压达到692 mV且产电更加稳定, 电池性能显著提升。
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关键词:
- 海底沉积物微生物燃料电池 /
- 氨气改性碳纤维毡 /
- 氮掺杂阳极 /
- 电化学性能 /
- 电池性能
Abstract: Graphite carbon felt anodes were treated with ammonia gas at 500 ℃, 650 ℃ and 800 ℃ respectively to construct marine sediment microbial fuel cells (MSMFCs) . The results show that the microbial and electrochemical activities of the modified anodes are improved evidently. The number (10.420×1011 cfu/m2) of microorganisms attached to the anode modified at 500 ℃ is 2.9 times of that of the blank group, indicating that the ammonia modification at 500 ℃ is beneficial to the adhesion of microorganisms. The cyclic voltammetric capacitance performance of the anode modified at 500 ℃ reaches 62.1 F/m2, which is 2.0 times of that of the blank group, showing that this treatment method can increase the redox electrochemical activity significantly. This treatment decreases the anode charge transfer resistance to 1/4 (from 62.39 Ω to 14.46 Ω) and increases exchange current density by 1.1 times of those of the blank group, indicating that the electron transfer kinetic activity and anti-polarization ability are enormously enhanced when the anode is treated at 500 ℃. The output power (60.07 mW/m2) of the anode modified at 500 ℃ is 2.1 times of that (29.17 mW/m2) of the blank group, the long-term output voltage reaches 692 mV and the power generation becomes more stable. -
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