Affiliation:
1. Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 P. R. China
2. School of Physical Science and Technology ShanghaiTech University Shanghai 201210 P. R. China
3. Department of Chemistry Institute of Molecular Plus School of Science Tianjin University Tianjin 300072 P. R. China
4. School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 P. R. China
Abstract
AbstractEnvironmentally friendly electrochemical reduction of contaminated nitrate to ammonia (NO3−RR) is a promising solution for large quantity ammonia (NH3) production, which, however, is a complex multi‐reaction process involving coordination between different reaction intermediates of nitrate reduction and water decomposition‐provided active hydrogen (Hads) species. Here, a dual‐site catalyst of [W‐O] group‐doped CoP nanosheets (0.6W‐O‐CoP@NF) has been designed to synergistically catalyze the NO3−RR and water decomposition, especially the reactions between the intermediates of NO3−RR and water decomposition‐provided Hadsspecies. This catalytic NO3−RR exhibits an extremely high NH3yield of 80.92 mg h−1cm−2and a Faradaic efficiency (FE) of 95.2% in 1 mKOH containing 0.1 mNO3−. Significantly, 0.6W‐O‐CoP@NF presents greatly enhanced NH3yield and FE in a wide NO3−concentration ranges of 0.001–0.1 mcompared to the reported. The excellent NO3−RR performance is attributed to a synergistic catalytic effect between [W‐O] and CoP active sites, in which the doped [W‐O] group promotes the water decomposition to supply abundant Hads, and meanwhile modulates the electronic structure of Co for strengthened adsorption of Hadsand the hydrogen (H2) release prevention, resultantly facilitating the NO3−RR. Finally, a Zn‐NO3−battery has been assembled to simultaneously achieve three functions: electricity output, ammonia production, and nitrate treatment in wastewater.
Funder
National Natural Science Foundation of China
Chinese Academy of Sciences
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
17 articles.
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