Abstract
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•Synthesis of N, S co-doped G/CNT-Fe3C electrocatalyst via direct pyrolysis method.•Using co-doped graphene and iron carbide as new kinds of electrodes for electrochemical biosensing.•Excellent performance as enzyme-free H2O2sensors.•The sensor detection limit of H2O2 can be as low as 272 nM (S/N = 3)
A high temperature pyrolytic synthesis process was used to prepare N, S co-doped graphene/CNT-Fe3C composite materials. The optimization of heteroatom doping and its electrocatalytic performance towards H2O2 detection is significantly characterized and evaluated. The non-enzymatic hydrogen peroxide sensing is well catalyzed at NS-G/CNTFe-1 (10:1 weight ratio of melamine and thiourea) electrode with rapid response time and high cathodic current at −0.15 V (vs. Ag/AgCl), as compared to other modified electrodes. Chronoamperometry study reveals that the NS-G/CNTFe-1 electrode has a wide linear range with high selectivity and good operational stability.