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首页> 外文期刊>Electroanalysis >Electrocatalytic reduction of HNO2 by a silicomolybdate polyanion: A differential electrochemical mass spectrometry study
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Electrocatalytic reduction of HNO2 by a silicomolybdate polyanion: A differential electrochemical mass spectrometry study

机译：硅钼酸盐聚阴离子对HNO2的电催化还原：差分电化学质谱研究

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Electrocatalytic activities towards the reduction of important analytes such as nitrite, bromate, chlorate and hydrogen peroxide have been demonstrated for numerous heteropolyanions (HPAs). In this paper, the behavior of a Keggintype HPA, SiMo12O404-, on the one hand in solution and on the other hand immobilized in a conducting polymer, polypyrrole (PPy), in the presence of nitrous acid (HNO2) is examined. It is shown that the PPy films codoped with SiMO12O404+ and HSOT ions could be used as sensitive part of an amperometric sensor even if the response is limited by HNO2 diffusion into the PPy film. Differential electrochemical mass spectrometry (DEMS) was used to determine the gas formed during nitrous acid reduction by H2SiMo12O404-. Under an applied cathodic potential, when both HNO2 and SiMo12O404- are present in the medium, NO gas is produced whereas, when SiMo12O404- ions are immobilized in a PPy film, N2O evolves and the NO concentration, notably due to the disproportionation of HNO2, decreases.
机译：对于许多杂多阴离子（HPA），已经证明了其对还原重要分析物（如亚硝酸盐，溴酸盐，氯酸盐和过氧化氢）的电催化活性。在本文中，研究了一种Keggintype HPA SiMo12O404-的行为，该溶液一方面在溶液中，另一方面在亚硝酸（HNO2）存在下固定在导电聚合物聚吡咯（PPy）中。结果表明，即使SiNO2O404 +和HSOT离子共掺杂的PPy膜也可以用作安培传感器的敏感部分，即使响应受到HNO2扩散到PPy膜中的限制。差示电化学质谱法（DEMS）用于确定H2SiMo12O404-在亚硝酸还原过程中形成的气体。在施加的阴极电势下，当介质中同时存在HNO2和SiMo12O404-时，会产生NO气体，而当将SiMo12O404-离子固定在PPy膜中时，会产生N2O和NO浓度，特别是由于HNO2的歧化，减少。

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