Electrocatalytic Properties of Nitrous Oxide and Its Voltammetric Detection at Palladium Electrodeposited on a Glassy Carbon Electrode

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• 作者：Baoxing Wang and Xiao-yuan Li
• 刊名：Analytical Chemistry
• 出版年：1998
• 出版时间：May 15, 1998
• 年：1998
• 卷：70
• 期：10
• 页码：2181 - 2187
• 全文大小：90K
• 年卷期：v.70,no.10(May 15, 1998)
• ISSN：1520-6882

文摘

The electrochemical behavior of nitrous oxide (N₂O)onthe surface of electrodeposited palladium (Pd) was investigated by voltammetry in aqueous supporting electrolytes. It was found that N₂O is weakly adsorbed on aPd/GC electrode and can be reduced electrocatalytically witha high efficiency. The reduction product is notadsorbedon the Pd/GC electrode in aqueous neutral and alkalinesolutions. However, it is difficult for N₂O to bereducedon the same electrode in acidic electrolyte becausehydrogen adsorption competes for the adsorption sites.The concentration of N₂O can be quantitativelydetermined using the electrocatalytic reduction current ofN₂Oat the Pd/GC electrode. This electrode provides asensitive probe for the electrochemical detection of N₂Owitha low detection limit and a wide linear response rangefrom 24.3 M to 1.94 mM. A mechanism is proposed toaccount for the electrocatalytic reduction of N₂O onthePd/GC electrode, which adequately explains our experimental observations.