Figure 10.

Three-dimensional integration of various nanowires onto honeycomb substrates for a prototype high efficient catalytic converter. (A) Schematic illustration of in-situ three dimensional assembly of nanowires onto monolithic honeycomb substrates to develop a prototype catalytic converter. (B) Photographs of honeycomb substrates before and after nanostructure coverage. (C–E) SEM characterization of nanowires array-based catalytic converter at different magnification. Inset of (C) EDS mapping of ZnO nanowires based honeycombs. (F–I) SEM cross-section views of ZnO nanowires(F), TiO₂ nanorods(G), CeO₂ nanotubes(H) and Co3O₄ nanowires(I). [Reprinted with permission from reference Guo et al. (2013). Copyright 2013 Elsevier].