Nitrogen electrochemically reduced to ammonia with hematite: density-functional insights

Literature Information

Publication Date 2014-11-28
DOI 10.1039/C4CP04308A
Impact Factor 3.676
Authors

Manh-Thuong Nguyen, Nicola Seriani, Ralph Gebauer


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Abstract

Licht et al. (Science, 2014, 345, 637) recently proposed a procedure to synthesize NH3 from N2 and by steam electrolysis in molten hydroxide suspensions of nano-Fe2O3. This highly exciting investigation undoubtedly boosts the hope of the CO2-free and low-cost ammonia industry. To provide insights at the atomistic level into the reduction process of N2, we have carried out a density-functional study on the electrochemical formation of NH3 molecules on hematite(0001) surfaces. By considering associative and dissociative mechanisms, we have identified a reaction path that requires an applied bias of −1.1 V to allow the proton transfer processes to occur downhill. The most energy-demanding step is the addition of the first proton to the adsorbed molecular nitrogen. The computed bias is in good agreement with experimental electrolysis potentials that activate the electric current.

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Contents list

Front/Back Matter

DOI: 10.1039/C8CP91781G

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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