Electrochemical activation of graphene sheets embedded carbon films for high sensitivity simultaneous determination of hydroquinone, catechol and resorcinol
Electrochemical activation of graphene sheets embedded carbon films for high sensitivity simultaneous determination of hydroquinone, catechol and resorcinol
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DOI：
10.1016/j.snb.2019.127495
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发表时间：
2020-02-15
影响因子：
8.4
通讯作者：
Diao, Dongfeng
中科院分区：
文献类型：
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作者：
Huang, Liangliang;Cao, Yuanyuan;Diao, Dongfeng
研究了石墨烯碳片(GSEC)膜在氢氧化钾溶液中电化学活化高灵敏度同时测定对苯二酚(HQ)、邻苯二酚(CC)和间苯二酚(RC)。阐明了GSEC薄膜在碱性溶液中的电化学活化机理。我们发现，在活化过程中嵌入的石墨烯薄片被腐蚀，导致碳膜表面形成更多有缺陷的石墨烯边缘和羰基官能团。这些被腐蚀的石墨烯边缘提供了更多的电化学活性中心，加速了电子的转移。因此，活化的GSEC膜对HQ、CC和RC的氧化具有很高的电催化活性。HQ和CC的氧化还原峰间距分别由366 mV降至62 mV和262 mV降至54 mV。RC的氧化电位也从714 mV降至590 mV。该传感器对HQ、CC和RC的线性范围分别为0.5~200µM、0.5~200µM和0.2~400µM，检测下限分别为0.1µM、0.1µM和0.05µM。这些结果表明KOH活化的GSEC膜是一种很有前途的电极材料，可用于构建高灵敏度和高选择性的生物传感器。
In this study, the graphene sheets embedded carbon (GSEC) film was electrochemically activated in KOH solution for high sensitivity simultaneous determination of hydroquinone (HQ), catechol (CC) and resorcinol (RC). The electrochemical activation mechanism of GSEC films in alkaline solution was clarified. We found that the embedded graphene sheets were corroded during activation, resulting in the formation of more defective graphene edges and carbonyl functional groups at the surface of carbon film. These corroded graphene edges provided more electrochemical active sites and accelerated the electron transfer. Thus, the activated GSEC film exhibited highly electrocatalytic activity towards the oxidation of HQ, CC and RC. The redox peak separation for HQ and CC decreased from 366 mV to 62 mV and 262 mV to 54 mV, respectively. The oxidation potential of RC also decreased from 714 mV to 590 mV. The electrochemical sensor showed a wide liner response for HQ, CC and RC in the concentration range of 0.5 similar to 200 mu M, 0.5 similar to 200 mu M and 0.2 similar to 400 mu M with detection limit of 0.1 mu M, 0.1 mu M and 0.05 mu M, respectively. These results demonstrate that the KOH-activated GSEC film is a promising electrode material for constructing highly sensitive and selective biosensors.