Photoautotrophic cathodic oxygen reduction catalyzed by a green alga, Chlamydomonas reinhardtii

Authors

  • Xian-Wei Liu,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Xue-Fei Sun,

    1. School of Environmental Science and Engineering, Shandong University, Jinan, China
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  • Yu-Xi Huang,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Dao-Bo Li,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Raymond J. Zeng,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Lu Xiong,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Guo-Ping Sheng,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Wen-Wei Li,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Yuan-Yuan Cheng,

    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Shu-Guang Wang,

    1. School of Environmental Science and Engineering, Shandong University, Jinan, China
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  • Han-Qing Yu

    Corresponding author
    1. Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
    • Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China; telephone: +86-551-3607592; fax: +86-551-3601592
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  • Xian-Wei Liu and Xue-Fei Sun contributed equally to this work.

Abstract

Biofuel cells (BFCs) use enzymes and microbial cells to produce energy from bioavailable substrates and treat various wastewaters, and cathodic oxygen reduction is a key factor governing the efficiency of BFCs. In this study, we demonstrated that a green alga, Chlamydomonas reinhardtii, could directly mediate oxygen reduction. Cyclic voltammogram analysis revealed that the C. reinhardtii biofilm formed on a solid electrode was responsible for oxygen reduction without dosing of electron mediator. Furthermore, 4-electron oxygen reduction pathway was found in this self-sustained, light-responded BFC. The results of this study could expand our understanding and viewpoints of biocathode catalysis, which is essential for novel catalyst design and development for BFCs. Biotechnol. Bioeng. 2013; 110: 173–179. © 2012 Wiley Periodicals, Inc.

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