Surface N-doped graphene sheets induced high electrocatalytic activity for selective ascorbic acid sensing
By Huang, Liangliang; Cao, Yuanyuan; Diao, Dongfeng
Published in Sensors and Actuators B: Chemical
2019
Abstract
In this study, the graphene sheets embedded carbon (GSEC) film was modified with surface N-doping for highly selective ascorbic acid (AA) sensing. We found that the N-doped graphene sheets formed in-situ at the carbon film surface and induced high electrocatalytic activity for AA oxidation. Although surface N-doping slightly decreased the ID/IG and surface roughness of carbon film, the graphene sheets embedded in amorphous were preserved. With surface N-doping, the charge-transfer resistance was reduced from 22.5 ? cm2 to 3.9 ? cm2, the oxidation-reduction peak separation decreased to a low value of 65.7 mV in Fe(CN)64?/3? redox system, and the standard rate constant was increased from 0.24
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