期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 41, 期 33, 页码 14507-14518出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.06.212
关键词
Liquid ammonia electrolytic cell; Ammonium salt; Hydrogen generation; Minimum electrolysis voltage; Alloy electrode
资金
- NNSF of China [21301152, 21371150, 21573192]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Liquid ammonia electrolysis is conducted out at ambient temperature using different ammonium salt electrolytes with and without the reference electrode. It is determined that electrolytes containing NH4+ increase the current density and reduce the solution resistance. Moreover, ammonium salts of NH4Br, NH4NO3 and NH4Cl preserve >80% current efficiency and a 0.6-0.8 mL min(-1) average rate of H-2 generation during chronopotentiometry tests at 120 mA cm(-2) for 3 h. A minimum electrolysis voltage (E-min) of ca. 1.2 V is required for the NH4Cl electrolyte when using Pt-foil as the anode and cathode. To decrease the overpotential of the anode reaction, five types of electrocatalysts were prepared and characterized: Pt-black, Rh, Pt-Ir, Rh-Pt and Ph-Pt-Ir alloys. Trimetallic Rh-Pt-Ir and bimetallic Pt-Ir, Rh-Pt (1:1) alloy electrodes exhibit a combined benefit of better activity and minimized deactivation. The ternary Rh-Pt-Ir alloy anode shows the best electrocatalytic activity with the lowest E-min of ca. 0.47 V and highest current density of 46.9 mA cm(-2) at 2.0 V. In comparison with the Pt-foil anode, the E-min is reduced by two-thirds, and the current density is increased two-fold. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据