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宏观和纳米孔径的Ag电极使选择性和稳定的水性CO2减少成为可能

Behnam Nourmohammadi Khiarak¹, Gelson T S T da Silva^1,2, Valentine Grange^1,3

¹Department of Chemical Engineering, Queen's University, Kingston, ON, K7L 3N6, Canada.

Small (Weinheim an der Bergstrasse, Germany)

|December 24, 2024

概括

这项研究通过激活银 (Ag) 网来增强水溶液中的电化学二氧化碳 (CO2) 减少. 该方法提高了二氧化碳转化为二氧化碳的转化率,克服了液相电解的局限性.

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
催化剂是一种催化剂.

背景情况:

水性电化学二氧化碳 (CO2) 减少为气相电解提供了替代方案,避免了洪水和盐沉等问题.
液相二氧化碳电解通常因有限的二氧化碳可用性而遭受低反应速率.
开发高效的催化剂和反应条件对于推进二氧化碳转化技术至关重要.

研究的目的:

为了提高二氧化碳的可用性和转化率在水性电化学减少.
为了研究表面激活对二氧化碳转化为二氧化碳的白银催化剂的影响.
为了实现高选择性和稳定性,从二碳酸盐溶液中生产二氧化碳.

主要方法:

使用宏的银 (Ag) 网作为电极材料.
通过氧化/还原循环激活Ag表面,以创建纳米孔状结构.
采用二碳酸盐水溶液,通过溶解的二氧化碳和现场生成来增加二氧化碳的可用性.
优化激活过程以微调表面形态和催化性能.

主要成果:

具有纳米孔状结构的活性化Ag表面显著有利于CO2到CO的转化.
结合溶解的CO2和现场产生的CO2从二碳酸盐增加了CO2的可用性.
实现的CO2到CO的转换率超过100mA cm-2.2.
在100 mA cm-2.2时获得了超过85%的法拉代克CO效率.
在出口气流中报告的高CO度 (24.7%).
在100小时内表现出卓越的稳定性,持续高CO法拉第效率.

结论:

通过氧化/还原循环对Ag网的表面激活是一种有效的策略,可以增强水性电化学二氧化碳的减少.
拟议的方法显著增加了二氧化碳的可用性和二氧化碳的生产率.
这种方法为高效和稳定的二氧化碳转化为二氧化碳的电化学转化提供了一个有希望的途径.

关键词:

在CO电合成过程中.捕获二氧化碳的方法用水养的二氧化碳的电还原.电催化剂是一种电催化剂.纳米孔径的Ag金属网格

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