Highly efficient Ag doped δ-MnO2 decorated graphene: Comparison and application in electrochemical detection of H2O2

Cytotoxic H(2)O(2)is an inevitable part of our life, even during this contemporary pandemic COVID-19. Personal protective equipment of the front line fighter against coronavirus could be sterilized easily by H(2)O(2)for reuse. In this study, Ag doped 8-MnO2 nanorods supported graphene nanocomposite (denoted as Ag@8-MnO2/G) was synthesized as a nonenzymatic electrochemical sensor for the sensitive detection of H2O2. The ternary nano composite has overcome the poor electrical conductivity of delta-MnO2 and also the severe aggregation of Ag NPs. Furthermore, delta-MnO2/G provided a rougher surface and large numbers of functional groups for doping more numbers of Ag atoms, which effectively modulate the electronic properties of the nanocomposite. As a result, electroactive surface area and electrical conductivity of Ag@delta-MnO2/G increased remarkably as well as excellent catalytic activity observed towards H(2)O(2)reduction. The modified glassy carbon electrode exhibited fast amperometric response time (< 2 s) in H(2)O(2)determination. The limit of detection was calculated as 68 nM in the broad linear range (0.005-90.64 mM) with high sensitivity of 104.43 mu A mM(-1) cm(-2). No significant interference, long-term stability, excellent reproducibility, satisfactory repeatability, practical applicability towards food samples and wastewater proved the efficiency of the proposed sensor.

Automated summary

In this study, a nonenzymatic electrochemical sensor was synthesized for the sensitive detection of H2O2 using Ag doped 8-MnO2 nanorods supported graphene nanocomposite. The sensor demonstrated excellent catalytic activity and high sensitivity.