Spinel CoMn2O4 hollow nanospheres for very wide linear and sensitive detection of hydrogen peroxide

Spinel CoMn2O4 hollow nanospheres with diameter of similar to 200 nm were facilely prepared using poly-vinylpyrrolidone (PVP) as structure directing agent, which possessed hierarchical pore distribution and large surface area of 43.5 m(2) g(-1). The above nanomaterials were simply drop-coated on the surface of bare glass carbon electrode (GCE) to generate CoMn2O4/GCE. In phosphate buffer (PBS, pH = 7), the modified electrode presents rapidly sensitive response and low detection limit (0.38 mu M) to H2O2. Especially, its linear detection range (0.0012-10 0.4 mM) is the widest among reported spinel oxide-based electrochemical sensors to date. This excellent electrocatalytic H2O2 sensing performance primarily derives from the synergism of unique hollow nanosphere structure and the redox coupling of Co3+/Co2+ and Mn3+/Mn2+. In addition, the CoMn2O4/GCE sensor also shows good H2O2 recovery in rat serum and commercial disinfectant, indicating that it has a certain potential application in related environmental and biological fields. (C) 2021 Elsevier B.V. All rights reserved.