Ag/ZnO Catalysts with Different ZnO Nanostructures for Non-enzymatic Detection of Urea
- Authors
- Yoon, Jaesik; Lee, Doohee; Lee, Eunji; Yoon, Young Soo; Kim, Dong-Joo
- Issue Date
- Jan-2019
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Silver catalyst; Electrocatalyst; Zinc oxide nanorods; Zinc oxide nanoflakes; Sensors; Non-enzymatic urea sensor
- Citation
- ELECTROANALYSIS, v.31, no.1, pp.17 - 21
- Journal Title
- ELECTROANALYSIS
- Volume
- 31
- Number
- 1
- Start Page
- 17
- End Page
- 21
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/2022
- DOI
- 10.1002/elan.201800595
- ISSN
- 1040-0397
- Abstract
- 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.
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