水分离效率控制了用于CO2电解的反偏偏双极膜的可行性
Gerard Prats Vergel1, Huan Mu1, Nikita Kolobov1
1Department of Chemical Engineering, Faculty of Applied Sciences, Delft University of Technology, Delft, The Netherlands.
概括
在二氧化碳电解器中的反偏偏双极膜 (r-BPM) 对无阳极有希望,但由于水解离效率 (WDE) 低而受到影响. 目前的r-BPM无法保持性条件,限制了它们的工业应用.
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:
- 在反向偏差 (r-BPM) 下运行的双极膜为二氧化碳电解器提供无阳极通路.
- 氧化演化反应 (OER) 需要有效的氧化物 (OH-) 补充来维持性解质.
- 在r-BPM中,可离子交叉降低了水解离效率 (WDE),导致解离体酸化和阳极腐蚀.
研究的目的:
- 在膜电极组件配置中实验确定r-BPMs的WDE.
- 调查电流密度,解质度和离子标识对r-BPM性能的影响.
- 为了建模稳定的r-BPM CO2电解的长期运行要求.
主要方法:
- 在不同的操作条件下对r-BPM WDE进行实验测量.
- 膜电极组件的制造和测试.
- 电化学建模用于预测长期稳定性.
主要成果:
- 对于r-BPMs,实验中获得的最高WDE为98%,这对于持续的性无解质操作是不够的.
- 离子交叉被确定为低于100%的WDE的主要原因.
- 建模表明,WDE超过99.8%是必要的超过10,000个小时的操作与实际的解体积.
结论:
- 目前的r-BPM技术不足以稳定,工业规模的CO2电解,因为WDE不足.
- 对于长期的稳定性,需要使用金组金属阳极或实施解质再生等策略.
- 在r-BPM设计的进一步进步对于克服co-ion交叉车的局限性至关重要.
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