Electrochemical
ammonia (NH3) production, an alternative
to the energy-intensive Haber process, has been extensively studied
based on the basis of N2 fixation; a high-yield production
is hindered by the sluggish kinetics of the N2 reduction
reaction (N2RR) process originating from the strong triple
bonds. Thus, several studies have primarily focused on discovering
efficient catalysts for the N2RR. However, the development
of a rate-limiting dissociation of N2 remains a major challenge.
In this study, we propose a simple strategy to improve the electrochemical
NH3 production rate by using an oxygen ionic conducting
ceramic-based electrolysis cell and nitric oxide (NO), which has a
lower bonding energy in comparison to N2. A maximum value
of the NH3 synthesis rate of 1885 μmol cm–2 h–1 (Faradaic efficiency of 34.8%) with a negligible
thermal decomposition rate of 0.16% was achieved at 650 °C under
atmospheric conditions. This study demonstrated an alternative approach
for NO-based electrochemical NH3 production as well as
the efficient utilization of NO, which is harmful to the environment.
The energy‐efficiency loss with high overpotential during hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), as well as economic inefficiencies including high‐cost materials and complicated processes, is considered the major challenge to the implementation of electrochemical water splitting applications. The authors present a new platform for electrocatalysts that functions in an unprecedented way to turn a catalyst into substrate. The NiFe alloy catalyzed substrate (NiFe‐CS) described herein is substantially active and stable electrocatalyst for both HER and OER, with low overpotential of 33 and 191 mV at 10 mA cm−2 for HER and OER, respectively. This structure enables not only the maximization of electrochemically active sites, but also the formation of hydroxyl species on the surface as the active phase. These outstanding results provide a new pathway for the development of electrocatalysts used in energy conversion technology.
This contribution details our comprehensive efforts to design a chemically and mechanically stable dual-phase membrane with a high oxygen permeation flux. To enhance the mechanical and thermo-mechanical strength of the...
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