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首页> 外文期刊>Environmental Science & Technology >Electricity Generation and Pollutant Degradation Using a Novel Biocathode Coupled Photoelectrochemical Cell
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Electricity Generation and Pollutant Degradation Using a Novel Biocathode Coupled Photoelectrochemical Cell

机译：新型生物阴极耦合光电化学电池的发电与污染物降解

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摘要

The photoelectrochemical cell (PEC) is a promising tool for the degradation of organic pollutants and simultaneous electricity recovery, however, current cathode catalysts suffer from high costs and short service lives. Herein, we present a novel biocathode coupled PEC (Bio-PEC) integrating the advantages of photocatalytic anode and biocathode. Electrochemical anodized TiO_2 nanotube arrays fabricated on Ti substrate were used as Bio-PEC anodes. Field-emission scanning electron microscope images revealed that the well-aligned TiO_2 nanotubes had inner diameters of 60-100 nm and wall-thicknesses of about 5 nm. Linear sweep voltammetry presented the pronounced photocurrent output (325 μA/cm~2) under xenon illumination, compared with that under dark conditions. Comparing studies were carried out between the Bio-PEC and PECs with Pt/C cathodes. The results showed that the performance of Pt/C cathodes was closely related with the structure and Pt/C loading amounts of cathodes, while the Bio-PEC achieved similar methyl orange (MO) decoloration rate (0.0120 min~(-1)) and maximum power density (211.32 mW/m~2) to the brush cathode PEC with 50 mg Pt/C loading (Brush-PEC, 50 mg). The fill factors of Bio-PEC and Brush-PEC (50 mg) were 39.87% and 43.06%, respectively. The charge transfer resistance of biocathode was 13.10 Ω, larger than the brush cathode with 50 mg Pt/C (10.68 Ω), but smaller than the brush cathode with 35 mg Pt/C (18.35 Ω), indicating the comparable catalytic activity with Pt/C catalyst. The biocathode was more dependent on the nutrient diffusion, such as nitrogen and inorganic carbon, thus resulting in relatively higher diffusion resistance compared to the brush cathode with 50 mg Pt/C loading that yielded similar MO removal and power output Considering the performance and cost of PEC system, the biocathode was a promising alternative for the Pt/C catalyst.
机译：光电化学电池（PEC）是用于降解有机污染物和同时回收电力的有前途的工具，但是，当前的阴极催化剂成本高，使用寿命短。在这里，我们提出了一种新型的生物阴极耦合PEC（Bio-PEC），它结合了光催化阳极和生物阴极的优势。 Ti衬底上制备的电化学阳极氧化的TiO_2纳米管阵列被用作Bio-PEC阳极。场发射扫描电子显微镜图像显示，排列良好的TiO_2纳米管的内径为60-100 nm，壁厚约为5 nm。与在黑暗条件下相比，线性扫描伏安法在氙气照明下显示出显着的光电流输出（325μA/ cm〜2）。在Bio-PEC和带有Pt / C阴极的PEC之间进行了比较研究。结果表明，Pt / C阴极的性能与阴极的结构和Pt / C的负载量密切相关，而Bio-PEC达到了相似的甲基橙（MO）脱色率（0.0120 min〜（-1））。 Pt / C负载为50 mg时，刷阴极PEC的最大功率密度（211.32 mW / m〜2）（Brush-PEC为50 mg）。 Bio-PEC和Brush-PEC（50 mg）的填充因子分别为39.87％和43.06％。生物阴极的电荷转移电阻为13.10Ω，大于具有50 mg Pt / C的电刷阴极（10.68Ω），但小于具有35 mg Pt / C的电刷阴极（18.35Ω），表明与Pt具有可比的催化活性/ C催化剂。与50 mg Pt / C负载的电刷阴极相比，生物阴极更依赖于养分扩散，例如氮和无机碳，因此导致相对较高的扩散阻力，考虑到MOC的性能和成本，其去除量和功率输出相似。在PEC系统中，生物阴极是Pt / C催化剂的有希望的替代品。

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  • 来源
    《Environmental Science & Technology》 |2014年第13期|7634-7641|共8页
  • 作者

    Yue Du; Yujie Feng; Youpeng Qu; Jia Liu; Nanqi Ren; Hong Liu;

  • 作者单位

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

    State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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