Highly efficient Ag doped δ-MnO(2) decorated graphene: Comparison and application in electrochemical detection of H(2)O(2)

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 δ-MnO(2) nanorods supported graphene nanocomposite (denoted as Ag@δ-MnO(2)/G) was synthesized as a nonenzymatic electrochemical sensor for the sensitive detection of H(2)O(2). The ternary nanocomposite has overcome the poor electrical conductivity of δ-MnO(2) and also the severe aggregation of Ag NPs. Furthermore, δ-MnO(2)/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@δ-MnO(2)/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 µA 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.