Manganese oxide ultrathin nanosheets sensors for non-enzymatic detection of H2O2

• MnO2 nanosheets as electrocatalysts were applied to detect H2O2 for the first time.
• The biosensors showed a wide linear range (5×10−6 M–3.5×10−3 M).
• They showed high sensitivity (130.56 μA mM−1 cm−2) and low detection limit (1.5 μM).

A non-enzymatic hydrogen peroxide (H2O2) sensor was successfully realized from MnO2 ultrathin nanosheets, which was synthesized by a simple solution phase approach. The MnO2 ultrathin nanosheets based electrodes exhibited high electrochemical activity for the detection of H2O2 in phosphate buffer solution at an applied potential of + 0.7 V. The non-enzymatic biosensors showed a wide linear range (5×10−6 M to 3.5×10−3 M), a low detection limit (1.5 µM) and high sensitivity (130.56 μA mM−1 cm−2) towards H2O2, which could be attributed to the high surface area and electrocatalytic activity of MnO2 ultrathin nanosheets. These results demonstrate that such MnO2 ultrathin nanosheets offer great promise for non-enzymatic biosensor applications.

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