A novel MnO–CrN nanocomposite based non-enzymatic hydrogen peroxide sensor. Issue 31 (27th May 2021) - Tareen, Ayesha Khan
Abstract : A MnO–CrN composite was obtained via the ammonolysis of the low-cost nitride precursors Cr(NO3 )3 ·9H2 O and Mn(NO3 )2 ·4H2 O at 800 °C for 8 h using a sol–gel method. Abstract : A MnO–CrN composite was obtained via the ammonolysis of the low-cost nitride precursors Cr(NO3 )3 ·9H2 O and Mn(NO3 )2 ·4H2 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 (H2 O2 ) 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 H2 O2 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 H2 O2 sensing.