To expand the application of nanozymes,homogeneously dispersed manganese atoms were doped into the hollow carbon skeleton by ion exchange and high temperature pyrolysis,and a hollow manganese nanozyme(Mn-NC)was prepared.A colorimetric method based on Mn-NC was developed to detect the concentration of hydrogen peroxide pro-duced in situ by electrochemical two-electron oxygen reduction.The results show that Mn-NC has excellent peroxidase like activity and can catalyze the oxidation of colorless 3,3',5,5'-tetramethylbenzidine(TMB)to blue oxidized TMB by hydrogen peroxide.When the hydrogen peroxide concentration is 0～6 mmol/L,the absorbance of the system has a good multi-segment linear relationship with the hydrogen peroxide concentration,and Mn-NC colorimetric method has very low detection limit(0.45 μmol/L)and excellent anti-interference performance.
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