On the performance of membraneless laminar flow-based fuel cells

Ranga S. Jayashree, Seong Kee Yoon, Fikile R. Brushett, Pedro O. Lopez-Montesinos, Dilip Natarajan, Larry J. Markoski, Paul J.A. Kenis

Research output: Contribution to journalArticlepeer-review

Abstract

This paper reports on the characterization and optimization of laminar flow-based fuel cells (LFFCs) for both performance and fuel utilization. The impact of different operating conditions (volumetric flow rate, fuel-to-electrolyte flow rate ratio, and oxygen concentration) and of different cell dimensions (electrode-to-electrode distances, and channel length) on the performance (both power density and fuel utilization) of individual LFFCs is investigated. A finite-element-method simulation, which accounts for all relevant transport processes and electrode reactions, was developed to explain the experimental results here. This model can be used to guide further LFFC optimizations with respect to cell design and operation conditions. Using formic acid as the fuel, we measured a peak power density of 55 mW cm-2. By hydrodynamically focusing the fuel to a thin stream on the anode we were able to reduce the fraction of fuel that passes through the channel without reacting, thereby increasing the fuel utilization per pass to a maximum of 38%. This paper concludes with a discussion on the various trade-offs between maximizing power density and optimizing fuel utilization per pass for individual LFFCs, in light of scaling out to a multichannel LFFC-based power source system.

Original languageEnglish (US)
Pages (from-to)3569-3578
Number of pages10
JournalJournal of Power Sources
Volume195
Issue number11
DOIs
StatePublished - Jun 1 2010

Keywords

  • Fuel cell
  • Fuel crossover
  • Fuel utilization
  • Hydrodynamic focusing
  • Laminar flow
  • Membraneless

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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