The use of natural hierarchical porous carbon from Artemia cyst shells alleviates power decay in activated carbon air-cathode
The use of natural hierarchical porous carbon from Artemia cyst shells alleviates power decay in activated carbon air-cathode
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使用来自丰年虫孢囊壳的天然分层多孔碳可减轻活性炭空气阴极的功率衰减
DOI：
10.1016/j.electacta.2019.05.098
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发表时间：
2019-08
影响因子：
6.6
通讯作者：
Wang Xin
中科院分区：
文献类型：
--
作者：
Du Qing;Cheng Tao;Liu Yarui;Li Nan;Wang Xin
活性炭（AC）空气阴极被证明在废水能量回收方面具有广阔的前景。然而，在微生物燃料电池（MFC）中长期运行后，其性能会下降。在这里，我们添加了一种天然分层多孔富氮碳材料，碳化卤虫壳（LC），以减轻功率衰减。当空气阴极采用质量比为1:2的AC和LC混合物（命名为1AC2LC）时，电流密度比AC阴极高28%（开始）和65%（运行1年后），长期功率密度从0.871±0.002（AC）增加到运行一年后为1.296±0.005Wm−2(1AC2LC)。库仑效率比对照提高了20%。这主要归因于这些不规则的分级孔增强了催化剂层中的氧传递，因为氧传质系数增加了3.4倍，其中中孔和大孔扩大，显示了氧传递对寿命和能量产生的重要性。我们的研究结果展示了一种新方法，即添加廉价的碳化卤虫囊壳，以优化阴极多孔结构并延长 MFC 的使用寿命。
Activated carbon (AC) air-cathode is demonstrated to be promising for the energy recovery from wastewaters. However, it suffers from the performance decay after long-term operation in microbial fuel cells (MFCs). Here we add a natural hierarchical porous nitrogen-rich carbon material, carbonizedArtemiacyst shells (LC), to alleviate the power decay. When the air-cathode is made of a mixture of AC and LC with a mass ratio of 1:2 (named 1AC2LC), the current densities are 28% (the beginning) and 65% (after 1 year's operation) higher than AC cathodes, and the long-term power densities increase from 0.871 ± 0.002 (AC) to 1.296 ± 0.005 W m−2(1AC2LC) after one year's operation. The Coulombic efficiency increases by 20% than the control. This can be primarily attributed to these inerratic hierarchical pores enhancing oxygen transfer in the catalyst layer since the oxygen mass transfer coefficient is increased by 3.4 times, where the meso- and macro-pores are enlarged, showing the importance of oxygen transfer on the longevity and energy production. Our results show a novel way, addition of inexpensive carbonizedArtemiacyst shells, to optimize cathodic porous structure and enhance the longevity of MFCs.
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