Ag/ZnO Catalysts with Different ZnO Nanostructures for Non‐enzymatic Detection of Urea,Electroanalysis

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Ag/ZnO Catalysts with Different ZnO Nanostructures for Non‐enzymatic Detection of Urea
Electroanalysis ( IF 2.7 ) Pub Date : 2018-09-27 , DOI: 10.1002/elan.201800595
Jaesik Yoon ₁ , Doohee Lee ₁ , Eunji Lee ₁ , Young Soo Yoon ₂ , Dong-Joo Kim ₁

Affiliation

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 cm² 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.

中文翻译：

用于非酶法检测尿素的具有不同ZnO纳米结构的Ag / ZnO催化剂

通过溅射沉积和溶液生长过程的组合，合成了具有不同晶体学取向的涂银的ZnO纳米棒和纳米薄片。然后研究了不依赖酶的尿素传感器的形态依赖型Ag / ZnO纳米结构的催化性能。与碳电极上的Ag / ZnO纳米薄片相比，碳电极上的Ag / ZnO纳米棒具有更高的催化活性和更高的效率。Ag / ZnO纳米棒催化剂，具有更大的电化学表面积（169 cm ² mg ^-1碳电极上的）由于电子转移容易，促进了尿素的电氧化，进一步促进了尿素的电解。Ag / ZnO纳米棒催化剂还显示出起始电压显着降低（相对于Ag / AgCl为0.410 V）和电流密度（相对于Ag / AgCl为0.55 V）增加（12.0 mA cm ^-2 mg ^-1）。尿素电氧化的结果表明，Ag / ZnO纳米结构可以成为非酶生物传感器和燃料电池的潜在催化剂。

更新日期：2018-09-27

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