Abstract
Through interface and defect engineering, the rich defective FeS2-SnS2 heterogeneous nanoplates have been in-situ grown on poly(1-vinyl-3-ethylimidazole bromide) functionalized polypyrrole/graphene oxide (PVEIB/PPy/GO). The obtained FeS2-SnS2/PVEIB/PPy/GO exhibited the best electrocatalytic performance towards nitrogen reduction reaction (NRR) and the lowest binding energy of Sn 3p, Sn 3d and S 2p orbitals among a series of electrocatalysts prepared by different modifier under the same reaction conditions. Therefore, PVEIB played an important role in the construction of FeS2-SnS2/PVEIB/PPy/GO, resulting in the rich planar defects at the heterointerface of FeS2-SnS2 nanoplates, which was benefit to improve the nitrogen activation capacity. Otherwise, the irreversible phase transitions also occurred after FeS2-SnS2/PVEIB/PPy/GO suffering long term NRR test, eventually resulting in the deactivation of FeS2-SnS2/PVEIB/PPy/GO towards NRR. It will provide a theoretical basis and practical experience for the study of electrocatalyst deactivation based on metal sulfides.
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