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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Ozone Generation on a Nanocomposite SnO2 Electrode
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Electrochemical Ozone Generation on a Nanocomposite SnO2 Electrode

机译：纳米复合SnO 2 电极上电化学臭氧的产生

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A nanocomposite SnO2 electrode was prepared and its performance on electrochemical ozonesynthesis was studied. The factors affecting ozone production and its current efficiency, such ascurrent density, temperature, pH, supporting electrolyte and liquid flow, were investigated. Theformation of hydroxyl radical was detected using trapping protocol and was compared with ozonegeneration. The results indicate that the ozone production increases with current density, and an-2 optimum current density of 5 mA cm is obtained for the current efficiency of ozone generation.Lower temperature, lower pH and higher liquid flow favor ozone production as well as its currentefficiency. As a supporting electrolyte, Na2SO4 appears to be more suitable than NaClO4, NaNO3 andNaCl for ozone generation on the nanocomposite SnO2 electrode. An optimum electrolyteconcentration of Na2SO4 is observed to be 0.25 M, and a little bit of KPF6 addition (0.01 - 0.05 M) hasan obviously positive effect on ozone generation. Current density and solution pH have a coincidenteffect on ozone and hydroxyl radical generation, while temperature has an inconsistent effect on ozoneand hydroxyl radical generation and KPF6 addition has no effect on hydroxyl radical generation on thenanocomposite SnO2 electrode. The morphology and structure of the nanocomposite SnO2 electrodebefore and after accelerated life test were characterized by SEM and XRD analysis. It is suggested thatthe deactivation of nanocomposite SnO2 electrode is caused by the destruction of SnO2 coating filmand the growth of TiO2 between Ti-base and SnO2 coating film.
机译：制备了纳米复合SnO2电极，研究了其在电化学臭氧合成中的性能。研究了影响臭氧产生及其电流效率的因素，例如电流密度，温度，pH，支持电解质和液体流量。使用捕获方案检测羟基自由基的形成，并将其与臭氧生成进行比较。结果表明，臭氧的产生随电流密度的增加而增加，可获得2的5 mA cm的最佳电流密度，以提高臭氧的产生效率。较低的温度，较低的pH值和较高的液体流量有利于臭氧的产生及其电流效率。 。作为支持电解质，Na2SO4似乎比NaClO4，NaNO3和NaCl更适合在纳米复合SnO2电极上产生臭氧。观察到Na2SO4的最佳电解质浓度为0.25 M，添加少量KPF6（0.01-0.05 M）对臭氧产生具有明显的积极影响。电流密度和溶液pH值对臭氧和羟基自由基的产生有同时的影响，而温度对臭氧和羟基自由基的产生却没有稳定的影响，而KPF6的添加对复合纳米SnO2电极上羟基自由基的产生没有影响。通过SEM和XRD分析表征了纳米复合SnO2电极在加速寿命试验前后的形貌和结构。提示纳米复合SnO2电极失活是由于SnO2涂膜的破坏和TiO2在Ti基和SnO2涂膜之间的生长引起的。

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