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(NO3)(3)center dot 9H(2)O and Mn(NO3)(2)center dot 4H(2)O at 800 degrees 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 (H2O2) was studied via applying cyclic voltammetry (CV) and amperometry (i-t) analysis. The linear response range was 0.33-15 000 mu M with a correlation coefficient (R-2) value of 0.995. Excellent performance toward H2O2 was observed with a limit of detection of 0.059 mu M, a limit of quantification of 0.199 mu M, and sensitivity of 2156.25 mu A 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 H2O2 sensing.