Zhang, P., Hu, Z., Wang, Y., Qin, Y., Li, W. and Wang, J. (2016) “A Bi-layer Composite Film Based on TiO2 Hollow Spheres, P25, and Multi-walled Carbon Nanotubes for Efficient Photoanode of Dye-sensitized Solar Cell”, Nano-Micro Letters, 8(3), pp. 232-239. doi: 10.1007/s40820-015-0081-1.