Open AccessDirect Pyrolysis of a Manganese‐Triazolate Metal–Organic Framework into Air‐Stable Manganese Nitride Nanoparticles
Author(s) -
Hu Yating,
Li Changjian,
Xi Shibo,
Deng Zeyu,
Liu Ximeng,
Cheetham Anthony K.,
Wang John
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202003212
Subject(s) - manganese , pyrolysis , nanomaterials , metal organic framework , nanoparticle , nitride , graphitic carbon nitride , materials science , metal , chemical engineering , chemistry , nanotechnology , inorganic chemistry , catalysis , organic chemistry , metallurgy , adsorption , layer (electronics) , photocatalysis , engineering
Although metal–organic frameworks (MOFs) are being widely used to derive functional nanomaterials through pyrolysis, the actual mechanisms involved remain unclear. In the limited studies to date, elemental metallic species are found to be the initial products, which limits the variety of MOF‐derived nanomaterials. Here, the pyrolysis of a manganese triazolate MOF is examined carefully in terms of phase transformation, reaction pathways, and morphology evolution in different conditions. Surprisingly, the formation of metal is not detected when manganese triazolate is pyrolyzed in an oxygen‐free environment. Instead, a direct transformation into nanoparticles of manganese nitride, Mn 2 N x embedded in N‐doped graphitic carbon took place. The electrically conductive Mn 2 N x nanoparticles show much better air stability than bulk samples and exhibit promising electrocatalytic performance for the oxygen reduction reaction. The findings on pyrolysis mechanisms expand the potential of MOF as a precursor to derive more functional nanomaterials.