Nanostructured Porous Electrodes by the Anodization of Gold for an Application as Scaffolds in Direct-electron-transfer-type Bioelectrocatalysis
Nanostructured Porous Electrodes by the Anodization of Gold for an Application as Scaffolds in Direct-electron-transfer-type Bioelectrocatalysis
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DOI：
10.2116/analsci.18p302
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发表时间：
2018-11-01
影响因子：
1.6
通讯作者：
Kano, Kenji
中科院分区：
文献类型：
--
作者：
Sakai, Kento;Kitazumi, Yuki;Kano, Kenji
本研究以草酸或葡萄糖为还原剂，通过阳极氧化法制备了纳米多孔金电极，并将其作为支架材料应用于直接电子转移（DET）型生物电催化。在阳极氧化中产生的金阳离子似乎被还原剂还原以构建多孔金结构。使用两种DET型模型酶，胆红素氧化酶（BOD）和过氧化物酶（POD），分别用于双氧的四电子还原和过氧化物的两电子还原，检查电极的DET型性能。BOD和POD的阳极氧化多孔金电极表现出明确的S形稳态波对应的DET型生物电催化。扫描电子显微镜图像显示电极上的海绵状孔。阳极氧化多孔金电极显示出作为DET型生物电催化支架的前景。
In this study, nanostructured porous gold electrodes were prepared by the anodization of gold in the presence of oxalic acid or glucose as a reductant, and applied as scaffolds for direct electron transfer (DET)-type bioelectrocatalysis. Gold cations generated in the anodization seem to be reduced by the reductant to construct a porous gold structure. The DET-type performance of the electrode was examined using two DET-type model enzymes, bilirubin oxidase (BOD) and peroxidase (POD), for the four-electron reduction of dioxygen and the two-electron reduction of peroxide, respectively. BOD and POD on the anodized porous gold electrodes exhibited well-defined sigmoidal steady-state waves corresponding to DET-type bioelectrocatalysis. Scanning electron microscopy images revealed sponge-like pores on the electrodes. The anodized porous gold electrodes demonstrate promise as scaffolds for DET-type bioelectrocatalysis.