...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Improved Performance of Ni- and Co-YSZ Anodes via Sulfidation to NiS- and CoS-YSZ. Effects of Temperature on Electrokinetic Parameters
【24h】

Improved Performance of Ni- and Co-YSZ Anodes via Sulfidation to NiS- and CoS-YSZ. Effects of Temperature on Electrokinetic Parameters

机译：通过硫化成NiS-和CoS-YSZ可以改善Ni-和Co-YSZ阳极的性能。温度对电动参数的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Single-cell solid oxide fuel cell (SOFC) experiments using Ni yttria-stabilized zironia (YSZ) and Co-YSZ anodes were performed to examine the electrochemical oxidation of H2 and H2S/H2 mixtures. The introduction of 10%v/v H2S into the fuel stream resulted in anodes that initially showed significant signs of degradation. However, when all of the metal was changed to metal-sulfide, the performance was enhanced under most tested conditions, suggesting that metal-sulfides are viable anode materials for SOFC systems. Electrochemical experiments, mass spectrometry of the exhaust gas, and X-ray diffraction of the postrun anodes show that the main anodic reaction is hydrogen oxidation in both fuel streams. Direct current experiments at various temperatures were performed to determine the inverse Tafel slope (Lefat slope, b~(-1)) and the resulting charge-transfer coefficients for Ni-, Co-, NiS- and CoS-YSZ anodes. For three of the four anodes tested, the Lefat slope decreased with increasing T but not with the required slope of alpha F/R. The relationship was better represented by alpha F/R + K. The charge-transfer coefficient was determined to be 1.5 for Ni-, Co- and NiS-YSZ anodes, suggesting that the rate-determining step of hydrogen oxidation on these anodes is the electron transfer between H_(ad) and O~(2-). The CoS-YSZ exhibited traditional Tafel behavior such that a remained constant over a wide temperature range but yielded a charge-transfer coefficient much less than that of the other anodes (a = 0.21 ± 0.04).
机译：进行了使用Ni氧化钇稳定的氧化锆（YSZ）和Co-YSZ阳极的单电池固体氧化物燃料电池（SOFC）实验，以检查H2和H2S / H2混合物的电化学氧化。向燃料流中引入10％v / v H2S导致阳极最初显示出明显的降解迹象。但是，当所有金属都变为金属硫化物时，在大多数测试条件下性能得到增强，这表明金属硫化物是SOFC系统的可行阳极材料。电化学实验，废气质谱和后运行阳极的X射线衍射表明，两种燃料流中的主要阳极反应是氢氧化。进行了各种温度下的直流电实验，以确定塔菲尔反斜率（Lefat斜率，b〜（-1））以及所得的Ni-，Co-，NiS-和CoS-YSZ阳极的电荷转移系数。对于测试的四个阳极中的三个，Lefat斜率随T的增加而降低，但不随所需的αF / R的斜率而降低。用F / R + K更好地表示了这种关系。Ni-，Co-和NiS-YSZ阳极的电荷转移系数确定为1.5，表明这些阳极上氢氧化的决定速率步骤是H_（ad）和O〜（2-）之间的电子转移。 CoS-YSZ表现出传统的Tafel行为，因此在较宽的温度范围内保持恒定，但电荷转移系数却远小于其他阳极（a = 0.21±0.04）。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号