氮摻雜中空多孔碳納米籠分級結構，特點有氮摻雜碳、中空結構、富含空隙、微觀納米籠、分級結構、具有在酸性環境和堿性環境條件下的良好氧還原活性。
離材料合成領域太久，這個反應路徑好復雜，三個固體粉末混合在一起進行熱解，感覺這個分級結構是個固相反應。
這種固相反應產率和克級別生產難度會大一些。
The decomposition of ZIF－8 and transformation into 3D N－doped carbon at about 600 °C． The weight loss over 900 °C mainly resulted from the evaporation of Zn （b．p．907 °C）． The bottom－top gas flow produced by iron acetate decomposition can promote the expansion of micropores in ZIF－8 framework， resulting in a hollow hierarchical and pore structure．
不知道不同顆粒表面的XPS是否會有Zn和Fe，失重沒有那么徹底，穆譜的峰還挺明顯。0－0．08 wt．％的鐵連個XPS峰都沒有感覺這個體系還是有些復雜，可能有微觀局部相分離行為。
難能可貴的是酸性體系下的催化活性，雖然是氫氧反應，但是能達到0．5A／cm2＠0．6V還是非常不容易。不知道長期運行后的可能失效行為和雜原子是否會有關聯。
N－doped carbon electrocatalyst： marked ORR activity in acidic media without the contribution by metal sites？
Fantao Kong， Xiangzhi Cui， Yifan Huang， Heliang Yao， Yafeng Chen， Han Tian， Ge Meng， Chang Chen， Ziwei Chang， Jianlin Shi
Abstract
Fe－N－C electrocatalysts have been demonstrated to be the most promising substitutes for benchmark Pt／C for oxygen reduction reaction （ORR）． Herein， we report that， a N－doped carbon materials with trace amount of iron （0－0．08 wt．％） show excellent ORR activity and durability comparable and even superior to those of Pt／C in both alkaline and acidic media without the significant contribution by the metal sites． Such a N－doped carbon （denoted as N－HPCs） features a hollow and hierarchically porous architecture， and more importantly， a non－covalent－bonded N－deficient／N－rich heterostructure providing the active sites for oxygen adsorption and activation owing to the efficient electron transfer between the layers． The primary Zn－air battery using N－HPCs as the cathode delivers a much higher power density of 158 mW cm－2， and the maximum power density in H2－O2 fuel cell reaches 486 mW cm－2， which is comparable to and even better than those using conventional Fe－N－C catalysts at cathodes．