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Direct Energy Extraction from Brown Macroalgae-Derived Alginate by Gold Nanoparticles on Functionalized Carbon Nanotubes

Authors

  • Dr. Le Quynh Hoa,

    Corresponding author
    1. JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    2. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    • Le Quynh Hoa, JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

      Eiichi Tamiya, Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

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  • Dr. Hiroyuki Yoshikawa,

    1. JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    2. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
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  • Dr. Masato Saito,

    1. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
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  • Prof. Dr. Mitsuyoshi Ueda,

    1. JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    2. Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502 (Japan)
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  • Prof. Dr. Toshiyuki Shibata,

    1. JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    2. Laboratory of Quality in Marine Products, Graduate School of Bioresources, Mie University, Kurima Machiya-cho 1577, Tsu, Mie 514-8507 (Japan)
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  • Prof. Dr. Eiichi Tamiya

    Corresponding author
    1. Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)
    • Le Quynh Hoa, JST, CREST, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

      Eiichi Tamiya, Department of Applied Physics, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871 (Japan)

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Abstract

The viability of employing brown macroalgae as a future renewable energy and chemical resource has so far proven to be challenging because of the low efficiency of the energy extraction process from alginate, which forms the principle, difficult-to-degrade component. In contrast to currently employed alginate-metabolizing microbial approaches, we here extract energy from macroalgae, for the first time, through a fuel cell system that exploits the electrochemical oxidation of alginate by gold nanoparticle-decorated functionalized carbon nanotubes without any external input of energy. The analyses suggest that the electrochemical oxidation process induces partial oxidation of alginate and, in addition to bioenergy, also yields valuable chemicals, which paves the way for the future production of energy and feedstock materials from inedible biomass.

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