Journal
JOURNAL OF POWER SOURCES
Volume 267, Issue -, Pages 219-226Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.05.028
Keywords
Microbial electrochemistry system; Cathode material; Diffusion layer; Water pressure tolerance
Funding
- National Science Fund for Distinguished Young Scholars [51125033]
- State Key Laboratory of Urban Water Resource Environment [2013DX08]
- National Natural Science Fund of China [51209061]
- International Cooperating Project between China [2011DFG93360]
- International Cooperating Project between Canada [2011DFG93360]
- Funds for Creative Research Group of China [51121062]
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To produce cathodes with high water pressure tolerance for the practical application of microbial electrochemical system (MES), a 3-m test configuration is set up. Three kinds of cathodes, including Pt-CC (carbon cloth with platinum carbon), Pt-CM (carbon mesh with platinum carbon), and AC-MM (metal mesh with activated carbon), are investigated. The electrochemical performances of these cathodes are tested with linear sweep voltammetry under varied water pressures. Current densities of Pt-CC and Pt-CM increase with the rising water pressures till the maximum endurable water head, which are 100 cm for Pt-CC and 130 cm for Pt-CM. Yet electrochemical performances of AC-MM remained stable under the tested water pressure range from 0 to 30 KPa. The deformation of cathodes under varied water pressures causes the changes of cathode performances. The curvature degrees of cathodes relate to their mechanical properties. Elastic modulus of AC-MM is 4 +/- 0.4 x 10(3) MPa, which is over 10 times larger than that of Pt-CM and over 60 times larger than that of Pt-CC. The best mechanical properties prevent AC-MM from the substantial deformation and the consequent lacerations and water flooding of diffusion layers. (C) 2014 Elsevier B.V. All rights reserved.
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