Flame oxidation of stainless steel felt enhances anodic biofilm formation and current output in bioelectrochemical systems.

Stainless steel (SS) can be an attractive material to create large electrodes for microbial bioelectrochemical systems (BESs), due to its low cost and high conductivity. However, poor biocompatibility limits its successful application today. Here we report a simple and effective method to make SS electrodes biocompatible by means of flame oxidation. Physicochemical characterization of electrode surface indicated that iron oxide nanoparticles (IONPs) were generated in situ on an SS felt surface by flame oxidation. IONPs-coating dramatically enhanced the biocompatibility of SS felt and consequently resulted in a robust electroactive biofilm formation at its surface in BESs. The maximum current densities reached at IONPs-coated SS felt electrodes were 16.5 times and 4.8 times higher than the untreated SS felts and carbon felts, respectively. Furthermore, the maximum current density achieved with the IONPs-coated SS felt (1.92 mA/cm(2), 27.42 mA/cm(3)) is one of the highest current densities reported thus far. These results demonstrate for the first time that flame oxidized SS felts could be a good alternative to carbon-based electrodes for achieving high current densities in BESs. Most importantly, high conductivity, excellent mechanical strength, strong chemical stability, large specific surface area, and comparatively low cost of flame oxidized SS felts offer exciting opportunities for scaling-up of the anodes for BESs.

[1]  P. S. Liu,et al.  Review Functional materials of porous metals made by P/M, electroplating and some other techniques , 2001 .

[2]  Dalva Lúcia Araújo de Faria,et al.  Raman microspectroscopy of some iron oxides and oxyhydroxides , 1997 .

[3]  E. Bielanska,et al.  Raman Microspectroscopy as a Unique Method of the Investigation of Acid Proof Steel Foil Oxidation , 2013 .

[4]  K. Rabaey,et al.  Microbial electrosynthesis — revisiting the electrical route for microbial production , 2010, Nature Reviews Microbiology.

[5]  P. Voort,et al.  Covalent immobilization of the Jacobsen catalyst on mesoporous phenolic polymer: A highly enantioselective and stable asymmetric epoxidation catalyst , 2013 .

[6]  H. Kreye,et al.  Oxidation of stainless steel in the high velocity oxy-fuel process , 2000 .

[7]  Willy Verstraete,et al.  Microbial ecology meets electrochemistry: electricity-driven and driving communities , 2007, The ISME Journal.

[8]  S. Freguia,et al.  Spontaneous modification of carbon surface with neutral red from its diazonium salts for bioelectrochemical systems. , 2013, Biosensors & bioelectronics.

[9]  D. Blackwood,et al.  Electrochemical & optical characterisation of passive films on stainless steels , 2006 .

[10]  K. Ogura,et al.  Formation and reduction of the passive film on iron in phosphate-borate buffer solution , 1978 .

[11]  Mary P. Ryan,et al.  Passivity of iron in alkaline solutions studied by in situ XANES and a laser reflection technique , 1999 .

[12]  Baikun Li,et al.  Bacterial adhesion to glass and metal-oxide surfaces. , 2004, Colloids and surfaces. B, Biointerfaces.

[13]  R. Davidson,et al.  Analysis of Passive Films on Stainless Steel by Cyclic Voltammetry and Auger Spectroscopy , 1985 .

[14]  Zhongliang Liu,et al.  Three-dimensional macroporous anodes based on stainless steel fiber felt for high-performance microbial fuel cells , 2014 .

[15]  Claire Dumas,et al.  Marine microbial fuel cell: Use of stainless steel electrodes as anode and cathode materials , 2007 .

[16]  Ming-hua Zhou,et al.  An overview of electrode materials in microbial fuel cells , 2011 .

[17]  D. Lowy,et al.  Harvesting energy from the marine sediment-water interface II. Kinetic activity of anode materials. , 2006, Biosensors & bioelectronics.

[18]  T. Hyeon,et al.  Chemical design of biocompatible iron oxide nanoparticles for medical applications. , 2013, Small.

[19]  Robert D. Boyd,et al.  Use of the atomic force microscope to determine the effect of substratum surface topography on bacterial adhesion , 2002 .

[20]  Ashley E. Franks,et al.  Microbial catalysis in bioelectrochemical technologies: status quo, challenges and perspectives , 2013, Applied Microbiology and Biotechnology.

[21]  Kun Guo,et al.  Hydrogen production from acetate in a cathode-on-top single-chamber microbial electrolysis cell with a mipor cathode , 2010 .

[22]  Tingyue Gu,et al.  A state of the art review on microbial fuel cells: A promising technology for wastewater treatment and bioenergy. , 2007, Biotechnology advances.

[23]  Alessandro A. Carmona-Martínez,et al.  Electrospun and solution blown three-dimensional carbon fiber nonwovens for application as electrodes in microbial fuel cells , 2011 .

[24]  Claire Dumas,et al.  Electrochemical activity of Geobacter sulfurreducens biofilms on stainless steel anodes , 2008 .

[25]  S. Freguia,et al.  Surfactant treatment of carbon felt enhances anodic microbial electrocatalysis in bioelectrochemical systems , 2014 .

[26]  Bin Lai,et al.  Deposition of Fe on graphite felt by thermal decomposition of Fe(CO)5 for effective cathodic preparation of microbial fuel cells. , 2013, Bioresource technology.

[27]  R. Farrow,et al.  Characterization of surface oxides by Raman spectroscopy , 1980 .

[28]  Voltammetric and impedimetric properties of nano-scaled -Fe2O3 catalysts supported on multi-walled carbon nanotubes: catalytic detection of dopamine , 2010 .

[29]  M. Herbst,et al.  Oxidation of AISI 304 and AISI 439 stainless steels , 2007 .

[30]  G. Wallace,et al.  The nanostructure of three-dimensional scaffolds enhances the current density of microbial bioelectrochemical systems , 2013 .

[31]  Jurg Keller,et al.  Effects of surface charge and hydrophobicity on anodic biofilm formation, community composition, and current generation in bioelectrochemical systems. , 2013, Environmental science & technology.

[32]  Bruce E. Logan,et al.  Scaling up microbial fuel cells and other bioelectrochemical systems , 2010, Applied Microbiology and Biotechnology.

[33]  C. Buisman,et al.  Towards practical implementation of bioelectrochemical wastewater treatment. , 2008, Trends in biotechnology.

[34]  Stefano Freguia,et al.  Microbial fuel cells: methodology and technology. , 2006, Environmental science & technology.

[35]  Bruce E Logan,et al.  Continuous electricity generation from domestic wastewater and organic substrates in a flat plate microbial fuel cell. , 2004, Environmental science & technology.

[36]  D. Costa,et al.  Influence of stainless steel surface treatment on the oxygen reduction reaction in seawater , 2001 .

[37]  Zhou-hua Jiang,et al.  High-temperature oxidation of duplex stainless steels in air and mixed gas of air and CH4 , 2005 .