A three-dimensional hierarchical nanoporous PdCu alloy for enhanced electrocatalysis and biosensing |
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| Authors: | Liu Aihua Geng Haoran Xu Caixia Qiu Huajun |
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| Institution: | aLaboratory for Nanobioelectronics & Biosensors, Qingdao Institute of Bioenergy and Bioprocess Technology, and Key Laboratory for Biofuels, Chinese Academy of Sciences, Qingdao 266101, China;bSchool of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China |
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| Abstract: | Nanoporous copper (NPC) obtained by dealloying CuAl alloy is used as both three-dimensional template and reducing agent for the fabrication of nanoporous PdCu alloy with hollow ligaments by a simple galvanic replacement reaction with H2PdCl4 aqueous solution. Electron microscopy and X-ray diffraction characterizations demonstrate that after the replacement reaction, the ligaments become hollow tubular structure and the ligament shell is also comprised of small pores and nanoparticles with a typical size of ∼4 nm (third order porosity). The as-prepared nanotubular mesoporous PdCu alloy (NM-PdCu) structure exhibits remarkably improved electrocatalytic activity towards the oxidation of formic acid and H2O2 compared with nanoporous Pd (NP-Pd), and can be used for sensitive electrochemical sensing applications. After coupled with glucose oxidase (GOx), the enzyme modified NM-PdCu electrode can sensitively detect glucose over a wide linear range (0.5–20 mM). |
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| Keywords: | Dealloying Galvanic replacement Formic acid Hollow nanostructure Glucose biosensor |
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