电位固定型电化学传感器中氨在Ir阳极上的电化学氧化

IF 3.1 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chemical Research in Chinese Universities Pub Date : 2008-11-01 DOI:10.1016/S1005-9040(09)60027-1

Yi-ping HAN , Peng LUO , Chen-xin CAI , Lei XIE , Tian-hong LU

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引用次数: 3

摘要

在电位固定型电化学传感器中，Ir催化剂对NH3和/或NH4OH的氧化具有良好的电催化活性和选择性。由于NH3和NH4OH在NaClO4溶液中的电化学行为相同，为了实验方便，可以用NH4OH代替NH3。结果表明，在nacl溶液中，NH4OH在Ir/GC电极处的氧化峰电位约为0.85 V，氧化峰电流密度与NH4OH浓度成线性关系。NH4OH的电催化氧化是扩散控制的。特别是，Ir对CO氧化没有电催化活性，说明CO不会干扰NH4OH的测定和中性溶液电位固定的电化学NH3传感器，并且阳极Ir催化剂具有良好的选择性。因此，Ir可能在具有中性溶液的电位固定电化学NH3传感器中具有实际应用价值。

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Electrochemical Oxidation of Ammonia on Ir Anode in Potential Fixed Electrochemical Sensor

Ir catalyst possesses a good electrocatalytic activity and selectivity for the oxidation of NH₃ and/or NH₄OH at Ir anode in the potential fixed electrochemical sensor with the neutral solution. Owing to the same electrochemical behavior of NH₃ and NH₄OH in a NaClO₄ solution, NH₄OH can be used instead of NH₃ for the experimental convenience. It was found that the potential of the oxidation peak of NH₄OH at the Ir/GC electrode in NaClO₄ solutions is at about 0.85 V, and the current density of the oxidation peak of NH₄OH is linearly proportional to the concentration of NH₄OH. The electrocatalytic oxidation of NH₄OH is diffusion-controlled. Especially, Ir has no electrocatalytic activity for the CO oxidation, illustrating that CO does not interfere in the measurement of NH₄OH and the potential fixed electrochemical NH₃ sensor with the neutral solution, and the anodic Ir catalyst possesses a good selectivity. Therefore, Ir may have practical application in the potential fixed electrochemical NH₃ sensor with the neutral solution.

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来源期刊

Chemical Research in Chinese Universities 化学-化学综合

CiteScore

5.30

自引率

6.50%

发文量

152

审稿时长

3.0 months

期刊介绍： The journal publishes research articles, letters/communications and reviews written by faculty members, researchers and postgraduates in universities, colleges and research institutes all over China and overseas. It reports the latest and most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across subdisciplines. Main research areas include (but are not limited to): Organic chemistry (synthesis, characterization, and application); Inorganic chemistry (bio-inorganic chemistry, inorganic material chemistry); Analytical chemistry (especially chemometrics and the application of instrumental analysis and spectroscopy); Physical chemistry (mechanisms, catalysis, thermodynamics and dynamics); Polymer chemistry and polymer physics (mechanisms, material, catalysis, thermodynamics and dynamics); Quantum chemistry (quantum mechanical theory, quantum partition function, quantum statistical mechanics); Biochemistry; Biochemical engineering; Medicinal chemistry; Nanoscience (nanochemistry, nanomaterials).