期刊
JOURNAL OF POWER SOURCES
卷 284, 期 -, 页码 245-251出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.002
关键词
Electrochemical ammonia synthesis; Barium zirconate; Electrocatalyst; Steam; Nitrogen
资金
- Research and Development Program of the Korea Institute of Energy Research (KIER) [B5-2447]
- National Research Council of Science & Technology (NST), Republic of Korea [KIER3-3] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Electrochemical ammonia synthesis from steam and nitrogen has been systematically investigated using a proton-conducting electrolyte supported cell based on 20 mol% yttrium doped barium zirconate (BaZr0.8Y0.2O3-delta) in a temperature range of 475-600 degrees C at atmospheric pressure. Silver (Ag), platinum (Pt), and lanthanum strontium cobalt ferrite (La0.6Sr0.4CO0.2Fe0.8O3-delta) are used for both anode and cathode electrocatalysts. Maximum ammonia formation rates of 4.9 x 10(-11) mol cm(-2) s(-1) and 8.5 x 10(-11) mol cm(-2) s(-1) are observed for Ag and La0.6Sr0.4C0.2Fe0.8O3-delta electrocatalysts, respectively, when a voltage of 0.8 V is applied. However, Pt electrocatalyst shows a negligible ammonia formation rate lower than 1 x 10(-12) mol cm(-2) s(-1). This is ascribed to the high activity of Pt for the hydrogen evolution reaction rather than the ammonia formation reaction. The conversion efficiency of all electrocatalysts is below 1%, primarily due to the limited nitrogen disassociation activity of the electrocatalysts. (C) 2015 Elsevier B.V. All rights reserved.
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