Facile synthesis of MnO2–Ag hollow microspheres with sheet-like subunits and their catalytic properties

Abstract

Hierarchical MnO₂–Ag hollow microspheres (HMs) with sheet-like subunits were facilely prepared through an in situ redox reaction and spontaneously self-assembled orientation via Ostwald ripening in a urea solution under a lower hydrothermal temperature (130 °C), without using any seed, template or capping agent. The as-prepared samples display an excellent electrocatalytic ability by the typical amperometric detection of H₂O₂ as a model system. The as-formed H₂O₂ sensor has a wide linear range from 1.31 μM to 36.71 mM (R = 0.9997), low detection limit (1.31 μM), high sensitivity (8.46 μA mM⁻¹), and fast response (<5 s).