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| Influence of NaN3 on Cathodic Oxygen Reduction Induced by Microbe-assisted Catalysis on Surface of 316LSS in Seawater |
| NIE Yuanyuan1, DUAN Jizhou2, DU Min1, HOU Baorong2 |
| 1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; 2. Key Laboratory of Marine Environmental Corrosion and Biological Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China |
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Abstract The influence of sodium azide NaN3 on cathodic oxygen reduction induced by microbe-assisted catalysis on the surface of 316LSS in seawater was studied in order to reveal the possible use of sodium azide (NaN3) as an agent to inhibit the activity of cytochrome c oxidase in microbial respiration. For such action, the adopted critical concentration of NaN3 was evaluated by fluorescence microscopic technology, and cyclic voltammograms and AC impedance were used to study the variations of electrochemical properties of the electrodes in seawater aerated with oxygen and nitrogen atmosphere respectively. Results showed that biofilm on the surface of the stainless steel could increase the intensity of reduction peak current density; however, it decreased obviously when stainless steel samples were disposed with NaN3, meanwhile, the peak potentials shifted negatively. According to the results of AC impedance, microbial respiration could directly promote the transfer of electrons to the final electron acceptor (oxygen); simultaneously reduce the tendency to corrosion of the stainless steel. It was suggested that the microbial adhesion on 316L stainless steel could change the traditional way of electron transfer of cathodic oxygen reduction in natural seawater, accelerating the transfer of electron to oxygen and finally catalyzing the reduction of oxygen.
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Received: 18 September 2013
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