Direct Electrochemistry and Catalytic Function on Oxygen Reduction Reaction of Electrodes Based on Two Kinds of Magnetic Nano-particles with Immobilized Laccase Molecules

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• 作者：Yang Yang ; Han Zeng ; Wen Shan Huo…
• 关键词：Laccase ; Ferriferrous oxide magnetic nano ; particles ; Carboxymethylated Chitosan ; Phthaloyl Chitosan ; Direct electrochemistry ; Oxygen reduction reaction
• 刊名：Journal of Inorganic and Organometallic Polymers and Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：201-214
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Inorganic Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer US
• ISSN：1574-1451
• 卷排序：27

文摘

Synthesized carboxymethylated Chitosan coupled magnetic Fe₃O₄ nano-particles and phthaloyl Chitosan overlapped magnetic Fe₃O₄ nano-particles, were used as enzyme matrices to prepare two prototypes of Laccase-based electrodes. Dependences of structural and operating parameters on characteristics of spectrometry, aggregation status and catalysis for oxygen reduction reaction of surface anchored protein molecules, were investigated and compared by electrochemical means in combination with spectroscopy and transmission electron microscopy. Results from experiments revealed that the latter electrode displayed favorable catalytic effect in oxygen reduction reaction in the absence of mediator. Key factor in limiting the efficiency of catalysis was ascribed to the diffusion process of the substrate into the layer of nano-particles containing Laccase. While the former electrode only showed efficient catalytic effect in oxygen reduction reaction in the presence of electron mediator with rate determining step in mass-transferring of mediator.