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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Understanding the electrolytic generation of sulfate and chlorine oxidative species with different boron-doped diamond anodes
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Understanding the electrolytic generation of sulfate and chlorine oxidative species with different boron-doped diamond anodes

机译：用不同的硼掺杂金刚石阳极了解硫酸盐和氯氧化物种的电解产生

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摘要

The electrochemical generation of several oxidative species was studied at the surfaces of five commercial borondoped diamond anodes with different doping levels (100-8000 ppm). These insights can open the possibility of tailoring anodes for a more efficient application in environmental remediation processes. All materials evaluated were characterized by linear sweep voltammetry, cyclic voltammetry, electrochemical impedance spectroscopy, contact angle, and scanning electron microscopy, as well as by bulk electrolysis. As a result, it was confirmed that the boron doping level influences the physical and electrochemical properties of the electrodes, indicating distinct behavior of the electrodes on the production of chlorine and sulfate oxidative species. The higher the boron doping, the lower is the crystallite size, and the higher is the conductivity, the hydrophilic behavior, and the electron-transfer activity. Voltammetric characterization demonstrates that low boron doping favors the formation of hydroxyl radicals, while high doping levels favor the direct electrochemical oxidation of sulfate or chloride. Moreover, when operating at high overpotentials in bulk electrolysis (typical conditions in environmental applications), the formation of chlorine and sulfate oxidative species is favored at low boron doping levels, This behavior is attributed to the very efficient mediated formation of these oxidants from the hydroxyl radicals, whose production is promoted with these electrodes at those conditions. It means that only operating at much softer conditions, the unique direct generation of hydroxyl oxidant occurs, opening a way for the potential prevention of perchlorate formation during disinfection by using highly boron-doped diamond anodes. (C) 2019 Elsevier B.V. All rights reserved.
机译：在具有不同掺杂水平（100-8000ppm）的五种商用硼孔金刚石阳极的表面的表面上研究了几种氧化物质的电化学产生。这些见解可以打开衡量阳极的可能性，以便在环境修复过程中更有效地应用。评价的所有材料都是通过线性扫描伏安法，循环伏安法，电化学阻抗光谱，接触角和扫描电子显微镜以及散装电解的所有材料。结果，证实硼掺杂水平影响电极的物理和电化学性质，表明电极对氯和硫酸盐氧化物质的产生明显的行为。硼掺杂越高，微晶尺寸越低，导电性，亲水性行为和电子转移活性越高。伏安表征表明，低硼掺杂有利于形成羟基的形成，而高掺杂水平赞成硫酸盐或氯的直接电化学氧化。此外，当在散装电解中的高过电位（环境应用中的典型条件）下操作时，在低硼掺杂水平下形成氯和硫酸盐氧化物质的形成，这种行为归因于从羟基中非常有效地介导的这些氧化剂的形成。在这些条件下用这些电极促进其生产的自由基。这意味着仅在更软的条件下操作，发生独特的直接产生羟基氧化剂，通过使用高硼掺杂的金刚石阳极在消毒期间打开潜在预防高氯酸盐的方法。 （c）2019 Elsevier B.v.保留所有权利。

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