尿素
石墨烯
催化作用
电极
循环伏安法
吸附
分子
化学工程
电化学
化学
材料科学
无机化学
纳米技术
物理化学
有机化学
工程类
作者
Ghada H. El-Nowihy,Mohamed S. El‐Deab
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-04-01
卷期号:169 (4): 046508-046508
被引量:4
标识
DOI:10.1149/1945-7111/ac6393
摘要
The electro-oxidation of ascorbate (AAO) in the presence of urea at NiOx/CoOx/GNs/GC electrode is investigated. Cyclic voltammetry measurements show that the peak current ( I p ) of AAO at NiOx/CoOx/GNs/GC electrode is ten times that of GNs/GC electrode. This highlights the role of catalyst composition and order of deposition on the activity of AAO. Interestingly, blending ascorbate (AH − ) with urea caused a significant promotion of AAO. Both the I p of AAO and the fuel utilization in the AH − /urea fuel blend solution are doubled when compared to those obtained at the same electrode in pure AH − solution (in addition to a favorable negative shift in the onset potential, E onset = 150 mV). Urea molecules are believed to act as anchoring molecules for AH − molecules at the NiOx/CoOx/GNs/GC surface with a favorable geometry facilitating its oxidation (by two-electron transfer process) to dehydroascorbate (DHA). Four interaction geometries are proposed, and comparative DFT calculations are conducted, displaying the relative stability and dipole moments of AH − in such a way that facilitates its adsorption and oxidation. These findings demonstrate the crucial role of the catalysts tailoring together with the selection of a smart blending fuel with AH − .
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