Zhixing Cheng,Ali Saad,Haichuan Guo,Caihong Wang,Siqi Liu,Tiju Thomas,Minghui Yang
A novel rapid nitridation process has been developed to synthesize a series of ordered mesoporous transition metal nitrides (TMNs) from their corresponding mesostructured metal oxides (TMOs). The TMOs in turn are prepared using mesoporous silica SBA-15, which is used as the hard template. The ordered mesoporous structures contribute to the interaction between ammonia and metal oxide precursors, which effectively shorten the nitridation time. Moreover, the rapid nitridation process saves time while also suppressing the closure and collapse of the mesoporous structures. To demonstrate the generic capability of the method: ordered mesoporous binary and ternary TMNs (CoN, WN, CrN and Ni 3 FeN) have been successfully synthesized within 30 min. As a practical application of the materials synthesized thus, mesoporous ternary nitride Ni 3 FeN is shown to exhibit outstanding oxygen evolution performance with very low overpotential (279 mV) at 10 mA cm −2 geometric current density. The observed performance is a superior performance to the Ir/C benchmark catalyst. The rapid, high yield method demonstrated implications for the production of nitrides for a wide range of applications in catalysis and beyond.
Zhixing Cheng,Ali Saad,Samira Adimi,Haichuan Guo,Siqi Liu,Tiju Thomas,Minghui Yang
Transition metal nitrides are promising substitutes for noble metal catalysts in photocatalytic hydrogen evolution reaction. Here, we use the cubic metal organic framework (MOF) Prussian blue, which has been rarely explored for nitride preparation. A rapid nitridation process is used for obtaining porous iron nitride (Fe2N) nanoparticles. The phase-pure Fe2N catalyst reported largely maintains the cubic geometry and specific surface area of the parent MOF. Fe2N is sensitized using Eosin-Y for boosting photocatalytic hydrogen evolution. Hydrogen production rates close to ∼14.5 mmol g−1 h−1 are observed, which are considered desirable. This is reasonable since the nitride phase has high electronic conductivity and low electrocatalytic H2-generation overpotential. Calculations indicate that the electronic conductivity of Fe2N is due to Fe-3d states. This work opens up new possibilities for the production of porous nitride photocatalysts for efficient hydrogen evolution.
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