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通过液体原料的电解来实现耐氧CO2的减少

Douglas J D Pimlott¹, Andrew Jewlal¹, Yongwook Kim¹

¹Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.

Journal of the American Chemical Society

|November 20, 2023

概括

使用液态二碳酸原料,如KHCO,使电解剂中高效的二氧化碳 (CO) 减少,即使存在氧气 (O). 这种方法避免了昂贵的O2去除步骤,提高了CO2利用率.

科学领域:

电化学
绿色化学
碳捕获和利用

背景情况:

二氧化碳 (CO2) 的电解降解受到氧 (O2) 的阻碍,因为O2的降解在热力学上受到青.
目前的方法需要在电解之前从CO2原料中去除昂贵的O2.
开发具有成本效益的二氧化碳减排技术对于碳捕获和利用至关重要.

研究的目的:

研究使用液态二碳酸原料进行高效和选择性的CO2电解.
证明液态二碳酸盐溶液可以克服CO2减排中的O2干扰.
为需要O2去除的气态CO2原料提供成本有效的替代品.

主要方法:

使用水性3.0M KHCO₃作为液体原料的电化学转化.
在O₂的存在下,与气态CO₂原料进行CO₂减少性能比较.
在不同O2度下对反应选择性和电流密度的分析.

主要成果:

液态二碳酸原料使得高效的二氧化碳降低到二氧化碳,在100 mA cm-2时具有65%的选择性,即便是用100%的二氧化碳供应.
在气态CO2原料中仅仅0.5%的O_{2_{1小时后将CO的选择性降低了90%以上.}}
液态二碳酸盐溶液在阴极保持高的CO2度,同时由于O2溶解度低而抑制O2的减少.

结论:

液态二碳酸原料提供了有效和选择性CO2电解的可行途径,而无需O2去除.
这种方法显著提高了CO2减排技术的经济可行性.
这些发现为改进碳捕获和利用策略铺平了道路.

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