4.8. Preparation of Multilayer ZIF-L Heterostructure Derivatives

The multilayer ZIF-L heterostructures including ZIF-L-Co, ZIF-L-3, ZIF-L-5, and ZIF-L-7 were calcined in a tube furnace in nitrogen with the temperature increasing from 30°C to 130°C for 60 min, 130°C to 280°C for 75 min, 280°C to 500°C for 22 min, and 500°C to 600°C for 20 min and held at 600°C for 120 min. The multilayer ZIF-L heterostructure derivatives including 1-CoNC, 3-CoZnNC, 5-CoZnNC, and 7-CoZnNC were obtained after being cooled to room temperature.