A 1.76 V hybrid Zn-O₂ biofuel cell with a fungal laccase-carbon cloth biocathode

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• 作者：Uffe B. Jensen^a ; Samuel Lö ; rcher^a ; Mikhail Vagin^a ; Jacques Chevallier^a ; Stepan Shipovskov^a ; Olga Koroleva^b ; Flemming Besenbacher^a ; Elena E. Ferapontova^a ; ^{elena.ferapontova@inano.au.dk}
• 关键词：Hybrid biofuel cell ; Fungal laccases ; Direct electron transfer ; Graphitized carbon cloth ; Zinc anode
• 刊名：Electrochimica Acta
• 出版年：2012
• 出版时间：15 February, 2012
• 年：2012
• 卷：62
• 期：Complete
• 页码：218-226
• 全文大小：1146 K

文摘

A hybrid biofuel cell has been constructed based on the Zn anode and O₂ biocathode, exploiting fungal Cerrena maxima and Choriolus hirsutus laccases cross-linked onto graphite and microstructured graphitized carbon cloth (GCC) electrodes. Immobilized at the graphite electrodes, laccases exhibited a high similarity in the reaction of direct (in the absence of any mediators) bioelectrocatalytic reduction of O₂ starting from 0.7 V vs. Ag/AgCl, pH 5, which was consistent with a 94 % structural homology of the laccases. The efficiency of the bioelectrocatalytic reaction was enhanced by immobilizing laccases on the high-surface area GCC, due to the increased surface concentration of the laccase molecules properly orientated for the direct electron transfer reaction within the micro-structured electrode. The hybrid biofuel cell, based on the battery-type Zn anode and oxygen laccase/GCC biocathode yielded the open-circuit voltage V_oc of 1.76 V and the short-circuit current density j_sc of 4 mA cm^? in quiescent aerated solutions. A maximum power density of the cell was 0.44 mW cm^? at the cell voltage of 0.5 V, pH 5. The hybrid biofuel cell exploiting cross-linked stabilized laccases at GCC was able to power a 1.5 V domestic device for 38 days.