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| Characterization of the Photoelectrode Based on the Immobilization of Microalgae |
| LV Yan-xia1,2, CHEN Zhao-an1, LU Hong-bin1, DENG Mai-cun1, XUE Song1, ZHANG Wei1 |
1. Marine Bioproducts Engineering Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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Abstract The microalgae photoelectrode prepared by immobilizing microalgae on the porous carbon paper displayed light-dependent electrogenic activity with electron mediators in a three-electrode system. The effect of different immobilization methods, diverse genera of microalgae and different electron mediators on photocurrent responses were investigated. The results showed that microalgae immobilized on the anode via silica sol-gel encapsulation exhibited the best photocurrent response. The diverse genera of microalgae including eukaryotic alga (Tetraselmis subcordiformis, Chlorella pyrenoidosa, Chlamydomonas reinhardtii CC 124, Isochrysis zhanjiangensis) and prokaryon alga (Synechococcus sp. PCC 7942) had similar response, demonstrating that the electrons from photosynthetic electron transfer chain of diverse genera of microalgae could be transferred to the electrode via exogenous artificial electron mediator. Benzoquinone and its derivatives as the electron mediator had anodic photocurrent response due to high redox potential, while methyl viologen exhibited low cathodic photocurrent response because of its low redox potential.
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Received: 13 January 2012
Published: 25 April 2012
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