Abstract
The Cover Feature illustrates the cross section of a Ti hollow fiber electrode modified with copper, enabling electrochemical reduction of nitric oxide to ammonia. The inside of the electrode is filled with NO, which is purged through the porous wall of the electrode to facilitate NO reduction at the gas-solid-liquid interface with high faradaic efficiency. More information can be found in the Article by P. M. Krzywda et al.
Highlights
Ammonia is an essential chemical for the production of fertilizers, and crucial for the global food supply
In acid electrolyte, hydrogen evolution was observed at ~ À 0.38 V, while in neutral conditions ~ À 0.55 V was required. This is in agreement with the sluggish kinetics of the HER in neutral electrolyte, caused by the required water dissociation step.[25,26]
In the presence of NO two reductive current maxima are clearly present, of which the first, depending on the electrolyte, has an onset potential of ~ 0.1 V vs RHE in acidic, and at ~ 0 V vs RHE in neutral conditions, respectively, maximizing at ~ À 0.1 V vs RHE independent of the electrolyte used. We assume this current response can be assigned to reduction of NO2, which is present in the feed due to insufficient purification of the NO used for the EC-MS experiments
Summary
Ammonia is an essential chemical for the production of fertilizers, and crucial for the global food supply. While acidic conditions appear favorable to prevent formation of partially reduced products in mass transfer limited conditions, Cu-decorated Ti hollow fibers are shown to enable ammonia production at production rates of 400 μmol hÀ 1 cmÀ 2 (at À 0.6 V vs RHE with almost 90 % faradaic efficiency) using diluted nitric oxide streams (10 % NO) in a flow-through configuration, and sodium sulphate as pH neutral electrolyte
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