膜物质:在电化学氨合成过程中防止氨交叉
Logan M Wilder1, Keenan Wyatt1,2, Christopher A Skangos1
1Chemistry and Nanoscience Center, National Renewable Energy Laboratory, 15013 Denver W Pkwy, Golden, Colorado 80401, United States.
概括
阳离子交换膜 (AEMs) 在电化学氨合成中最大限度地减少了氨/氨交叉,提高了法拉第克的效率,以实现分散的,无化石燃料的氨生产. 这项研究强调了AEM作为电解剂研究中的阴离子交换膜 (CEM) 的可行替代品.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 电化学降解 (E-NRR) 和降解 (E-NO3RR) 提供了可持续的氨合成途径.
- 氨 (NH3) 和氨 (NH4+) 穿过膜的交叉作用降低了效率,并在电解仪研究中引入了测量错误.
- 阴子交换膜 (CEM),像Nafion 212,表现出显著的NH3 / NH4 +交叉.
研究的目的:
- 选和评估商用膜用于产生氨的电解剂.
- 评估不同膜类型和细胞架构中的NH3 / NH4 +交叉.
- 为了确定缓解交叉的膜,以准确评估催化剂和改进氨合成.
主要方法:
- 商用膜的选,用于氨电解器.
- 测量NH3 / NH4 +交叉使用H细胞与Nafion 212 (CEM) 的设置.
- 在开放电路和应用电位 (-1.6 V) 下的零间隙气体扩散电极 (GDE) 电池中评估膜性能.
主要成果:
- 纳菲安212 (CEM) 显示出显著的NH3/NH4+交叉.
- 某些离子交换膜 (AEM) 显示了可以忽略不计的NH4+交叉.
- 大多数膜在开放电路GDE细胞中表现出大量的NH3交叉,这种情况在-1.6V时得到缓解.
结论:
- 在H细胞E-NRR和E-NO3RR研究中,AEM是CEM的一个有希望的替代品.
- 了解和减轻膜交叉对于准确的电解器性能评估至关重要.
- 在GDE细胞中的应用潜力显著影响NH3交叉,提供了改进的策略.
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