Electrochemical nitrate reduction to ammonia emerges as an attractive and promisssing technology for nitrate removal from water and simultaneous ammonia electrosynthesis, which demands electrocatalysts with high activity and selectivity. Herein,...
The Iridium-incorporated Co3O4 (Ir-Co3O4) catalyst is obtained from binary CoIr-based metal–organic framework precursors via controlled calcination treatment. Structural characterizations reveal that in-situ incorporation of Ir cations can cause lattice expansion...
Developing
high-efficiency electrocatalysts for the selective reduction
of nitrate to valuable ammonia is of great significance. Herein, Pd–PdO-modified
Co3O4 nanowire arrays on nickel foam (PdCoO/NF)
are fabricated by a facile cation-exchange reaction. Pd and PdO can
facilitate the generation of adsorbed hydrogen, and abundant oxygen
vacancies can promote nitrate activation. Therefore, the PdCoO/NF
exhibits a superior nitrate conversion rate (89.3%), Faradaic efficiency
(88.6%), and ammonium selectivity (95.3%) at −1.3 V versus
a saturated calomel electrode. The source of the produced ammonia
is confirmed by 15N isotope labeling experiments and 1H magnetic resonance. This presented synthetic method provides
a powerful strategy for the preparation of nanowire arrays with controllable
compositions for selective nitrate electroreduction to ammonia.
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