A novel MnO-CrN nanocomposite based non-enzymatic hydrogen peroxide sensor.

A MnO-CrN composite was obtained via the ammonolysis of the low-cost nitride precursors Cr(NO 3 ) 3 ·9H 2 O and Mn(NO 3 ) 2 ·4H 2 O at 800 °C for 8 h using a sol-gel method. The specific surface area of the synthesized powder was measured via BET analysis and it was found to be 262 m 2 g -1 . Regarding its application, the electrochemical sensing performance toward hydrogen peroxide (H 2 O 2 ) was studied via applying cyclic voltammetry (CV) and amperometry ( i - t ) analysis. The linear response range was 0.33-15 000 μM with a correlation coefficient ( R 2 ) value of 0.995. Excellent performance toward H 2 O 2 was observed with a limit of detection of 0.059 μM, a limit of quantification of 0.199 μM, and sensitivity of 2156.25 μA mM -1 cm -2 . A short response time of within 2 s was achieved. Hence, we develop and offer an efficient approach for synthesizing a new cost-efficient material for H 2 O 2 sensing.