Electrochemical ammonia synthesis from steam and nitrogen using proton conducting yttrium doped barium zirconate electrolyte with silver, platinum, and lanthanum strontium cobalt ferrite electrocatalyst

被引：69

作者：

Yun, Dae Sik ^{[1
]}

Joo, Jong Hoon ^{[1
]}

Yu, Ji Haeng ^{[1
]}

Yoon, Hyung Chul ^{[1
]}

Kim, Jong-Nam ^{[1
]}

Yoo, Chung-Yul ^{[1
]}

机构：

[1] Korea Inst Energy Res, Daejeon 305343, South Korea

来源：

JOURNAL OF POWER SOURCES | 2015年 / 284卷

关键词：

Electrochemical ammonia synthesis; Barium zirconate; Electrocatalyst; Steam; Nitrogen; ATMOSPHERIC-PRESSURE; CARBON-DIOXIDE; WET AIR; CELL; PERFORMANCE; DEGRADATION; PEROVSKITE; NH3;

D O I：

10.1016/j.jpowsour.2015.03.002

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：245 / 251

页数：7