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Ag/ZnO Catalysts with Different ZnO Nanostructures for Non‐enzymatic Detection of Urea
Author(s) -
Yoon Jaesik,
Lee Doohee,
Lee Eunji,
Yoon Young Soo,
Kim DongJoo
Publication year - 2019
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201800595
Subject(s) - nanorod , catalysis , urea , materials science , nanostructure , electrode , electrolysis , chemical engineering , inorganic chemistry , electrochemistry , biosensor , nanotechnology , chemistry , organic chemistry , electrolyte , engineering
Silver coated ZnO nanorods and nanoflakes with different crystallographic orientations were synthesized by a combination of sputter deposition and solution growth process. Catalytic properties of morphology‐dependent Ag/ZnO nanostructures were then investigated for urea sensors without enzyme. Ag/ZnO nanorods on carbon electrodes exhibit a higher catalytic activity and an improved efficiency than Ag/ZnO nanoflakes on carbon electrodes. Ag/ZnO nanorod catalysts with more electrochemically surface area (169 cm 2 mg −1 ) on carbon electrode facilitate urea electrooxidation due to easier electron transfer, which further promotes the urea electrolysis. The Ag/ZnO nanorod catalysts also show a significant reduction in the onset voltage (0.410 V vs. Ag/AgCl) and an increase in the current density (12.0 mA cm −2 mg −1 ) at 0.55 V vs Ag/AgCl. The results on urea electrooxidation show that Ag/ZnO nanostructures can be a potential catalyst for non‐enzymatic biosensors and fuel cells.