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Electricity Production by Metallic and Carbon Anodes Immersed in an Estuarine Sediment

퇴적토에 담지된 금속 및 탄소전극에 의한 전기 생산 특성

  • Song, Hyung-Jin (Department of Energy & Environmental Engineering, Soonchunhyang University) ;
  • Rhee, In-Hyoung (Department of Energy & Environmental Engineering, Soonchunhyang University) ;
  • Kwon, Sung-Hyun (Department of Marine Environmental Engineering/Institute of Marine Industry Gyeongsang National University) ;
  • Cho, Dae-Chul (Department of Energy & Environmental Engineering, Soonchunhyang University)
  • 송형진 (순천향대학교 에너지환경공학과) ;
  • 이인형 (순천향대학교 에너지환경공학과) ;
  • 권성현 (경상대학교 해양환경공학과(해양산업연구소)) ;
  • 조대철 (순천향대학교 에너지환경공학과)
  • Published : 2009.12.31

Abstract

One-chambered sediment cells with a variety of anodic electrodes were tested for generation of electricity. Material used for anodes was iron, brass, zinc/iron, copper and graphite felt which was used for a common cathode. The estuarine sediment served as supplier of oxidants or electron-producing microbial habitat which evoked electrons via fast metal corrosion reactions or a complicated microbial electron transfer mechanism, respectively. Maximum power density and current density were found to be $6.90\;W/m^2$ (iron/zinc) and $7.76\;A/m^2$ (iron), respectively. Interestingly, copper wrapped with carbon cloth produced better electric performance than copper only, by 60%, possibly because the cloth not only prevented rapid corrosion on the copper surface by some degrees, but also helped growing some electron-emitting microbes on its surface. At anodes oxidation reduction potential(ORP) was kept to be stationary over time except at the very initial period. The pH reduction in the copper and copper/carbon electrodes could be a sign of organic acid production due to a chemical change in the sediment. The simple estimation of interfacial, electrical resistances of electrodes and electrolyte in the sediment cell that a key to the electricity generation should be in how to control corrosion rate or microbial electron transfer activity.

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