화학공학소재연구정보센터
Catalysis Today, Vol.286, 51-56, 2017
Electrochemical synthesis of ammonia from wet nitrogen via a dual-chamber reactor using La0.6Sr0.4Co0.2Fe0.8O3-delta-Ce0.8Gd0.18Ca0.02O2-delta composite cathode
A La0.6Sr0.4Co0.2Fe0.8O3-delta-Ce0.8Gd0.18Ca0.02O2-delta composite cathode was used to investigate the electrochemical synthesis of ammonia from wet nitrogen. Wet nitrogen was flown through a dual chamber reactor under atmospheric pressure leading to the successful synthesis of ammonia. Ammonia was synthesised at a rate of 1.5 x 10(-10) mol s(-1) cm(-2) at 400 degrees C when applying a dc voltage of 1.4 V, which is the highest reported to date. This rate is twice that of the observed ammonia formation rate (7 x 10(-11) mol s(-1) cm(-2)) when Co-free cathode, La0.6Sr0.4FeO3-delta-Ce0.8Gd0.18Ca0.02O2-delta was used as the cathode catalyst. A higher catalytic activity for ammonia synthesis may be obtained when using a catalyst with high oxygen vacancies, with the introduction of oxygen vacancies at the cathode being a good strategy to improve the catalytic activity of ammonia synthesis. (C) 2016 The Authors. Published by Elsevier B.V.