有效地将稀释CO2转化为高度纯度和度的酸水溶液
Zhen-Hua Zhao1, Jia-Run Huang1, Da-Shuai Huang1
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510275, China.
Journal of the American Chemical Society
|May 14, 2024
概括
一种新的基于Bi的金属有机框架 (Bi-HHTP) 能有效地将稀释的二氧化碳转化为纯酸. 这种催化剂即使存在氧和,也能达到高性能,从而降低分离成本,并可直接用于燃料电池.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 目前的二氧化碳降电 (CO2RR) 使用高纯度的二氧化碳,导致产品分离成本较高.
- 与烟雾气相似的稀释二氧化碳流,由于O2和N2等杂质,是具有挑战性的原料.
- 现有的催化剂在现实气体混合物中的性能和产品纯度方面经常存在问题.
研究的目的:
- 使用稀释的二氧化碳原料开发一种高效的二氧化碳电解催化剂.
- 研究一种微孔导电的基于二氧化碳的金属有机框架 (Bi-HHTP),用于二氧化碳的捕获和转化.
- 为了实现高纯度的酸生产,降低分离成本.
主要方法:
- 合成和表征Bi-HHTP金属有机框架.
- 在稀释的二氧化碳大气 (15%的二氧化碳) 中对Bi-HHTP进行电化学测试.
- 在带有O2和N2的潮湿条件下对膜电极组件 (MEA) 电解器的性能评估.
- 分析产品的纯度和长期稳定性.
主要成果:
- 在高湿度下,Bi-HHTP有效地从稀释流中捕获二氧化碳.
- 在低电池电压 (2.6 V) 实现高电流密度 (80 mA cm-2) 和法拉代效率 (90%).
- 在O2和N2的存在下保持了卓越的性能,超过了以前的催化剂.
- 在MEA电解器中连续生产200mM纯酸溶液.
结论:
- 双HHTP是一种高效的催化剂,用于将稀释的二氧化碳电还原为高纯度的酸.
- 催化剂的微孔结构和开放的Bi位点有助于提高其性能.
- 这项工作提出了用于燃料电池应用的二氧化碳利用和酸生产的成本有效方法.
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