请教大家一下关于实验,In the first step of preparing the Ni(OH)2/CNT/NF electrode, CNTs were directly grown onto Ni foams via a thermal chemical vapor deposition (CVD) process. In a typical CVD process of in situ CNT growth, several 2 cm × 2 cm Ni foams without additional catalysts were heated up in a tube furnace at 750° in carbon feedstock gas C2H4.In the second step, a chemical bath deposition (CBD) process was carried out to deposit Ni(OH)2 nanostructures onto the as-grown CNT/NF current collectors. The CNT/NF substrates were immerged into a mixture solution of aqueous ammonia with nickel sulfates and potassium persulfates.在这里没加CNT为什么会得到CNT/NF 这种材料呢?