fig7
![Recent advances and perspectives of microsized alloying-type porous anode materials in high-performance Li- and Na-ion batteries](https://image.oaes.cc/e5a27bfe-a8ab-45f1-8d99-a2e3af359ad9/4937.fig.7.jpg)
Figure 7. Schematic illustrations of porous metal preparation via chemical etching method. (A) Schematic illustration of porous Si nanowires. Reproduced with permission[75] (Copyright 2012, American Chemical Society). (B) Schematic illustration of the formation process of porous Si wafer. Reproduced with permission[76] (Copyright 2015, Wiley-VCH Verlag).