Fig. 3. (a) Photographs of various nanosheet solutions in DI-water 15 min. after preparation (1) MnO2; (2) MnO2 and HCl; (3) MnO2 and NaCl; (4) MnO2, MES buffer and glucose; (5) MnO2, MES buffer, and gluconic acid; (6) MnO2, MES buffer, gluconic acid and H2O2. (b) Absorbance of the nanosheets in DI-water at 384 nm vs. time upon injecting H2O2. Near the ∼30 s mark, about 15 s of data have been omitted due to absorbance fluctuations caused by opening the spectrometer lid, injecting H2O2 and stirring. Initial reaction rate approx. 0.022 s−1.
