Electrochemical Synthesis of NH3 at Low Temperature and Atmospheric Pressure Using a gamma-Fe2O3 Catalyst

Title
Electrochemical Synthesis of NH3 at Low Temperature and Atmospheric Pressure Using a gamma-Fe2O3 Catalyst
Authors
남석우한종희함형철장종현윤창원박현서공지민임아연김도균성영은최정규
Keywords
Electrochemical ammonia synthesis; Iron oxide; Electrocatalyst; Membrane electrode assembly
Issue Date
2017-11
Publisher
ACS sustainable chemistry & engineering
Citation
VOL 5, NO 11-10995
Abstract
The electrochemical synthesis of NH3 by the nitrogen reduction reaction (NRR) at low temperature (<65 °C) and atmospheric pressure using nanosized γ-Fe2O3 electrocatalysts were demonstrated. The activity and selectivity of the catalyst was investigated both in a 0.1 M KOH electrolyte and when incorporated into an anion-exchange membrane electrode assembly (MEA). In a half-reaction experiment conducted in a KOH electrolyte, the γ-Fe2O3 electrode presented a faradaic efficiency of 1.9% and a weight-normalized activity of 12.5 nmol h&#8722; 1 mg&#8722; 1 at 0.0 VRHE. However, the selectivity toward N2 reduction decreased at more negative potentials owing to the competing proton reduction reaction. When the γ-Fe2O3 nanoparticles were coated onto porous carbon paper to form an electrode for a MEA, their weight-normalized activity for N2 reduction was found to increase dramatically to 55.9 nmol h&#8722; 1. However, the weight- and area-normalized N2 reduction activities of γ-Fe2O3 decreased progressively from 35.9 to 14.8 nmol h&#8722; 1 and from 0.105 to 0.043 nmol h&#8722; 1 cm&#8722; 2 act, respectively, during a 25 h MEA durability test. In summary, a study of the fundamental behavior and catalytic activity of γ-Fe2O3 nanoparticles in the electrochemical synthesis of NH3 under low temperature and pressure is presented.
URI
http://pubs.kist.re.kr/handle/201004/66661
ISSN
2168-0485
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KIST Publication > Article
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