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MoC nanocrystals confined in N-doped carbon nanosheets toward highly selective electrocatalytic nitric oxide reduction to ammonia
Ist Teil von
Nano research, 2022-10, Vol.15 (10), p.8890-8896
Ort / Verlag
Beijing: Tsinghua University Press
Erscheinungsjahr
2022
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Electrochemical nitric oxide reduction reaction (NORR) to produce ammonia (NH
3
) under ambient conditions is a promising alternative to the energy and carbon-intensive Haber-Bosch approach, but its performance is still improved. Herein, molybdenum carbides (MoC) nanocrystals confined by nitrogen-doped carbon nanosheets are first designed as an efficient and durable electrocatalyst for catalyzing the reduction of NO to NH
3
with maximal Faradaic efficiency of 89% ± 2% and a yield rate of 1,350 ± 15 µg·h
−1
·cm
−2
at the applied potential of −0.8 V vs. reversible hydrogen electrode (RHE) as well as high stable activity with negligible current density and NH
3
yield rate decays over a 30 h continue the test. Moreover, as a proof-of-concept of Zn−NO battery, it achieves a peak power density of 1.8 mW·cm
−2
and a large NH
3
yield rate of 782 ± 10 µg·h
−1
·cm
−2
, which are comparable to the best-reported results. Theoretical calculations reveal that the MoC(111) has a strong electronic interaction with NO molecules and thus lowering the energy barrier of the potential-determining step and suppressing hydrogen evolution kinetics. This work suggests that Mo-based materials are a powerful platform providing great opportunities to explore highly selective and active catalysts for NH
3
production.