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采用直流等离子体化学气相沉积方法制备了硼掺杂金刚石(BDD)薄膜电极。以水杨酸(SA)为羟基自由基捕获剂,测定了在BDD电极电催化电解过程中产生的羟基自由基的规律及相应的电催化机理。研究发现SA与·OH反应形成的羟基化产物为2,5-二羟基苯甲酸(2,5-DHBA),没有检测到2,3-二羟基苯甲酸(2,3-DHBA);确定了在BDD电极体系中,当电解条件为10 m A/cm2时,最适宜的检测条件为捕获剂SA的初始浓度为7 mmol/L,反应时间控制在30 min以内。通过计算得到10 m A/cm2条件下,·OH的生成速率为5.789 mol/(L·min)。
Boron doped diamond (BDD) thin film electrodes were prepared by DC plasma chemical vapor deposition. Using salicylic acid (SA) as a hydroxyl radical scavenger, the hydroxyl radical generated during the electrocatalytic electrolysis of BDD electrode was measured and the corresponding electrocatalytic mechanism was determined. It was found that the hydroxylation product formed by the reaction of SA with · OH was 2,5-dihydroxybenzoic acid (2,5-DHBA) and no 2,3-dihydroxybenzoic acid (2,3-DHBA) was detected. In BDD electrode system, when the electrolysis condition is 10 m A / cm2, the most suitable detection condition is that the initial concentration of the capture agent SA is 7 mmol / L and the reaction time is controlled within 30 min. By calculation, the generation rate of · OH was 5.789 mol / (L · min) under the condition of 10 m A / cm2.