A non-enzymatic hydrogen peroxide sensor based on vertical NiO nanosheets supported on the graphite sheet

•We fabricate a H2O2 sensor based on NiO nanosheets supported on graphite sheet.•The vertically aligned NiO nanosheets have large surface area.•The NiO nanosheets are used as H2O2 sensor without using polymer binder.•The H2O2 sensor shows a high sensitivity and stability.

In this study, a non-enzymatic hydrogen peroxide sensor was fabricated by directly growing vertically aligned NiO nanosheets on the graphite sheet through a simple, effective process, i.e. the surfactant-templated method. Compared with most of the reported hydrogen peroxide sensor through drop-coating method, our sensor exhibits a higher sensitivity and a good stability, resulting from the vertically aligned NiO nanosheets and method features. The as-prepared sensor exhibited a detection limit of 0.4 μM (at signal/noise = 3), a good reproducibility (relative standard deviation (RSD) of 3.36%), a wide linear range (up to 4.0 mM) with a sensitivity of 1077 μA mM−1 cm−2 under the optimal conditions. Furthermore, the as-prepared sensor also showed excellent selectivity and stability for hydrogen peroxide detection. This study provides a promising electrochemical electrode for hydrogen peroxide detection by a facile method.

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