Impact of catholyte recirculation on different 3-dimensional stainless steel cathodes in microbial electrolysis cells

Kyoung Yeol Kim, Emily Zikmund, Bruce E. Logan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

While stainless steel (SS) cathodes have shown great promise due to their low cost and high specific surface areas in microbial electrolysis cells (MECs), they have mainly been examined under static (no flow) conditions. Several different SS materials with different 3-dimensional structures (mesh, fiber felt, wool, and brushes) were compared in the absence and presence of fluid flow (0.05, 0.1 and 0.2 cm/s) past the cathode by catholyte recirculation. MECs with wool produced the highest hydrogen production rate with 1.3 ± 0.3 L-H2/L-reactor/d, which was the same as the Pt control at a catholyte recirculation of 40 mL/min (applied voltage of 0.9 V). In the absence of flow, hydrogen production rates of SS materials decreased by 52% (wool) to 28% (brush). The high hydrogen production rate using wool was likely a result of its high specific surface area (480 m2/m3-reactor volume), and reduced cathode overpotential due to gas removal by catholyte recirculation.

Original languageEnglish (US)
Pages (from-to)29708-29715
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number50
DOIs
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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