Abstract
We report here the rational development of MnO2 nanorods coated tea bag filter paper (TBFP) as a self-standing, bendable, and disposable electrochemical probe for the sensitive and selective H2O2 detection and addresses their challenges in H2O2 sensing via the replacement of ‘O’ with ‘S’ in the form of MnS microcubes and its core@shell architecture with MoS2. The as-configured MnS@MoS2/TBFP overwhelms the constrains of conventional electrochemical probes including time and cost consumed electrode surface renewability and catalyst loading progression, and the practice of an insulating binder. The hierarchical open porous architectures of MoS2-shell favour the diffusion of H2O2 into the core-MnS microcubes, facilitating an analyte utilization efficacy at both the core and shell architectures. The impacts of core@shell morphological features, replacement of ‘O’ with ‘S’, surface defects, and lattice distribution of MnS@MoS2 toward non-enzymatic H2O2 sensing performances are elucidated using variant electrochemical techniques. With the synergism of uniformly implanted and exposed metallic active sites, efficient electron transfer rate, and high analyte utilization efficiency, MnS@MoS2/TBFP exposes the low detection limit (120 nM), excellent sensitivity (650 μA mM−1 cm−2), and wide linear range (500 nM-5 mM) on H2O2 detection. Furthermore, the scrutinized non-enzymatic H2O2 detection concerts of MnS/MoS2/TBFP are selective, decisive, repeatable, and stable, constructing the excellent recovery rates in human urine sample analyses. Thus, the collective benefits of free-standing, flexible, binder-less, re-functional, and cost-efficient MnS@MoS2/TBFP probe actualize the evolution of affordable and high performance H2O2 sensors.
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∙MnS@MoS2 architectures are prepared by using a simple hydrothermal technique∙MnS@MoS2 modified TBFP is used as an electrochemical probe for H2O2 sensing∙Growth and formation mechanisms of MnS@MoS2 architectures are illustrated∙Mn(IV)/Mo(IV) centres engaged H2O2 electroreduction mechanism is schematized∙MnS@MoS2/TBFP establishes effectual non-enzymatic H2O2 sensing performances∙MnS@MoS2/TBFP’s real sample H2O2 sensing relevancy is actualized in human urine