Development of antifouling of electrochemical solid-state dissolved oxygen sensors based on nanostructured Cu_0.4Ru_3.4O₇ + RuO₂ sensing electrodes

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• 作者：Serge Zhuiykov^a ; ^{serge.zhuiykov@csiro.au} ; Kourosh Kalantar-zadeh^b
• 关键词：Antifouling ; Sensors ; Sensing electrode ; Dissolved oxygen ; RuO2
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：1 July, 2012
• 卷：73
• 期：Complete
• 页码：105-111
• 文件大小：1070 K

摘要

Tailoring nanostructured sensing electrode materials to high antifouling resistance has been one of the main priorities of the development of water quality sensors in the 21st century. Nanostructured Cu_0.4Ru_3.4O₇ + RuO₂-SEs have been developed to address the bio-fouling problem. The change in Cu_0.4Ru_3.4O₇ + RuO₂ structural development being promoted by advances in nano- and micro-scale pattering. Nanostructured Cu_0.4Ru_3.4O₇ + RuO₂-SEs with different mol%of Cu₂O were screen-printed on alumina sensor substrates and were consequently subjected to a 3-month field trial at the Water Treatment Plant. Their structural and electrochemical properties before and after the experiment were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical cyclic voltammerty (CV) techniques. The relationship between dissolved oxygen (DO) and the sensor's potential difference was found to be relatively linear, with the maximum sensitivity of 鈭?6 mV per decade being achieved at 20 mol%Cu₂O at 7.27 pH. Moreover, a 3-month field trial in the sewerage environment has shown that Cu_0.4Ru_3.4O₇ + RuO₂-SE with 20 mol%of Cu₂O possesses much higher defences against bio-fouling than the same SE with only 10 mol%of Cu₂O. The super-hydrophobic property of the developed Cu_0.4Ru_3.4O₇ + RuO₂ complex oxide has been considered as one of the essential pre-requisites for high antifouling resistance. Multiple antifouling defence strategies from biomimetic to bio-inspired must be incorporated in further development of nanostructured oxide SE to solve problems of bio-fouling on the sensor's SE.