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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