We have investigated the electrochemical oxidation of sulfuric acid on boron-doped synthetic diamond electrodes (BDD) obtained by HF CVD on p-Si. The results have shown that high current efficiency for sulfuric acid oxidation to peroxodisulfuric acid can be achieved in concentrated H2SO4 (>2 M) at moderate temperatures (8–10 °C). The main side reaction is oxygen evolution. Small amounts of peroxomonosulfuric acid (Caro's acid) have also been detected. A reaction mechanism involving hydroxyl radicals, HSO4− and undissociated H2SO4 has been proposed. According to this mechanism electrogenerated hydroxyl radicals at the BDD anode react with HSO4− and H2SO4 giving peroxodisulfate.ududud
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机译:我们已经研究了在p-Si上通过HF CVD获得的硼掺杂合成金刚石电极(BDD)上硫酸的电化学氧化。结果表明,在中等温度(8–10°C)下,在浓H2SO4(> 2 M)中,可以实现将硫酸氧化为过二硫酸的高电流效率。主要的副反应是氧气逸出。还检测到少量的过氧一硫酸(卡罗酸)。已经提出了涉及羟基自由基,HSO4-和未离解的H2SO4的反应机理。根据这种机理,BDD阳极上的电生成的羟基自由基与HSO4-和H2SO4反应,生成过二硫酸盐。 ud ud ud
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