The authors regret that there was an error with the TEM figure in Figure S2b in the Supplementary data. However, it has no influence on the conclusions of the paper. The corrected Figure S2b is updated as follows. The authors are terribly sorry for any inconvenience so caused. [Figure presented] Figure S2. (a) SEM, (b) TEM, and (c) HRTEM images of mesoporous TiO2, with the insets inverse fast Fourier transform (IFFT) images.