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キーワード:
ectrocatalysis; nitrogen fixation; nanomaterials; molybdenum selenide
要旨:
It has been long believed that FeMoS structure, where Fe is bonded with S, plays a pivotal role as a biomimetic catalyst for electrochemical nitrogen (N2) fixation . Nevertheless, the structure of Fe bonded to heavier analogues (Se or Te) has never been explored for N2 electrofixation. Here, we theoretically predict the electronic structure of FeMo(Se, Te) composed of tri-coordinated Fe species with open shells for binding with Se, which forms a collective electron pool for promoting N2 activation. Guided by this interesting prediction, we then demonstrate a two-step procedure to synthesize such structures, which displays remarkable N2 electrofixation activities with ammonia yield of 72.54 μg h-1 mg-1 and Faradic efficiency of 51.67% that are more than three times of the FeMoS counterpart. Further mechanism study has been conducted through density function theory (DFT) simulations. This work would provide new clues for designing versatile electrocatalytic materials for large-scale industrialization.
