Publication

Abstract : Probing H2O2 in drinking water is vital as it directly impacts the lives of aquatic animals and humans. Herein, we report an enzyme-free electrochemical voltammetric approach for selectively detecting H2O2 in drinking water employing NiFeP nanointerface for the first time. The NiFeP was synthesized via a two-pot synthesis by phosphorizing hydrothermally prepared NiFe Layered Double Hydroxides (LDH). Structural analysis revealed the disappearance of LDH-specific diffraction peaks ((0 0 3) and (0 0 6)) and the emergence of distinct NiFeP crystalline planes, confirming the successful structural conversion from NiFe-LDH to NiFeP. NiFeP nanointerface showed linear detection ranges of H2O2 (0.1–1 μM and 5–100 μM), with LODs of 0.027 μM and 1.58 μM, and sensitivities of 17.11 and 0.81 μA mM−1 cm−2, respectively. The enhanced electrochemical performance of the NiFeP system prevails in the interaction with H2O2, with substantial redox activity by reversible redox couples, compared to the NiFe LDH, where the redox couples (Ni2+/Ni3+ and Fe2+/Fe3+) are limited. This work demonstrates NiFeP as a redox-active nanointerface for highly selective enzyme-free H2O2 sensing, with recovery studies being carried out in drinking water, which validated its practical applicability in real-time environmental monitoring.