超亲气泡沫铜纳米线电极电化学还原CO2性能

doi:10.16085/j.issn.1000-6613.2023-0426

化工进展 ›› 2024, Vol. 43 ›› Issue (3): 1232-1240.DOI: 10.16085/j.issn.1000-6613.2023-0426

• 能源加工与技术 • 上一篇

超亲气泡沫铜纳米线电极电化学还原CO₂性能

王凯¹^,²(), 叶丁丁¹^,²(), 朱恂¹^,², 杨扬¹^,², 陈蓉¹^,², 廖强¹^,²

^1.重庆大学低品位能源利用技术及系统教育部重点实验室，重庆 400030
^2.重庆大学能源与动力工程学院工程热物理研究所，重庆 400030

收稿日期:2023-03-21 修回日期:2023-06-06 出版日期:2024-03-10 发布日期:2024-04-11
通讯作者: 叶丁丁
作者简介:王凯（1997—），男，硕士研究生，研究方向为电化学还原CO2。E-mail：1312660166@qq.com。
基金资助:
国家自然科学基金创新研究群体项目(52021004);重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0827);中央高校基本科研业务费项目(2020CDJ-LHZZ-046);重庆英才计划包干制项目(cstc2021ycjh-bgzxm0034)

Performance of electrochemical reduction of CO₂ by superaerophilic copper foam electrode with nanowires

WANG Kai¹^,²(), YE Dingding¹^,²(), ZHU Xun¹^,², YANG Yang¹^,², CHEN Rong¹^,², LIAO Qiang¹^,²

^1.Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China
^2.Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China

Received:2023-03-21 Revised:2023-06-06 Online:2024-03-10 Published:2024-04-11
Contact: YE Dingding

摘要/Abstract

摘要：

利用可再生电能进行电化学还原CO₂被认为是一种有前景的储能和减排技术，但在阴极发生析氢副反应，将降低电化学还原CO₂的性能。采用泡沫铜为基底制备铜纳米线电极扩展电极的电化学活性面积，然后通过十七氟癸基三甲基硅烷对电极进行亲气处理，使电极表面从疏气状态变为超亲气状态，从而强化气相反应物CO₂传质，增加反应三相接触线，提高电极的电化学还原 CO₂性能。实验结果表明：与未亲气处理的泡沫铜纳米线电极相比，所制备的超亲气泡沫铜纳米线电极虽然具有较小的电化学活性面积，但其超亲气的特性更有利于CO₂的传质，抑制了电解液中氢离子的传输，有效削弱了析氢副反应的发生。在电解电位为-1.5V（vs. Ag/AgCl）时，H₂法拉第效率降低了17.7%，电化学还原CO₂性能提升。

关键词: 电化学, 还原, 二氧化碳, 铜纳米线, 超亲气, 传质

Abstract:

Electrochemical reduction of CO₂ by renewable electricity is regarded as a promising method to storage energy and reduce emissions environmental problems. However, the hydrogen evolution side reaction at the cathode will reduce the performance of electrochemical reduction of CO₂. Nanowires were prepared on the copper foam electrode to expand the electrochemical active area of the electrode. Then, the copper foam nanowire electrode was treated with trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane to make the electrode surface change from aerophobic to aerophilic, which was expected to strengthen the mass transfer of gas-phase CO₂, increase the three-phase contact line of the reaction and further improve the performance of electrochemical reduction of CO₂. Experimental results showed that compared with the copper foam nanowire electrode without aerophilic treatment, although the prepared aerophilic electrode possessed lower electrochemical active area, its superaerophilic property was conducive to the mass transfer of CO₂, inhibited the transport of H⁺ in electrolyte and weakened the hydrogen evolution side reaction. As a result, the H₂ Faraday efficiency dropped by 17.7% at -1.5V (vs. Ag/AgCl) and the performance of electrochemical reduction of CO₂was improved.

Key words: electrochemical, reduction, carbon dioxide, copper nanowires, superaerophilic, mass transfer

中图分类号:

TQ021.4

王凯, 叶丁丁, 朱恂, 杨扬, 陈蓉, 廖强. 超亲气泡沫铜纳米线电极电化学还原CO₂性能[J]. 化工进展, 2024, 43(3): 1232-1240.

WANG Kai, YE Dingding, ZHU Xun, YANG Yang, CHEN Rong, LIAO Qiang. Performance of electrochemical reduction of CO₂ by superaerophilic copper foam electrode with nanowires[J]. Chemical Industry and Engineering Progress, 2024, 43(3): 1232-1240.

图/表 11

图1 CuNW Foam-SL电极制备流程图

图2 电极的SEM、EDS和XRD图

图3 电极的XPS图谱

图4 电极的TEM图

图5 电极的接触角测试

图6 电极的电化学活性面积测试

图7 电极的电化学测试

图8 电极的电化学还原CO2性能

图9 电极表面的物质传输示意图

图10 电极在KHCO3溶液中的实物图

图11 电极电流密度曲线

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超亲气泡沫铜纳米线电极电化学还原CO₂性能

Performance of electrochemical reduction of CO₂ by superaerophilic copper foam electrode with nanowires

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