Abstract
Manganese dioxides of different crystalline structures with different dimensionality (amorphous MnO2 nanoparticles, α-MnO2 nanoparticles, and β-MnO2 nanowires) were synthesized, characterized, and evaluated for their electrocatalytic activity to H2O2. Via a direct and facile electrochemical deposition method, MnO2 nanomaterials were codeposited onto glassy carbon (GC) electrodes with chitosan hydrogel. The catalytic oxidation current of amorphous MnO2 nanoparticles per unit mass to H2O2 is much larger than that of α-MnO2 nanoparticles and β-MnO2 nanowires; however, the catalytic oxidation current of amorphous MnO2 per unit surface area to H2O2 is the same as that of α-MnO2 nanoparticles and much less than that of one-dimensional β-MnO2 nanowires. The bicatalytic activity toward H2O2 of the electrodes modified with three different nanomaterials increases in the following order: amorphous MnO2 > α-MnO2 > β-MnO2. Further codeposition of chitosan hydrogel, choline oxidase (ChOx), and different MnO2 nanomateri...
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