阳离子表面活性剂喷涂对ZnMg棒状双金属氢氧化物电催化还原CO2产CO性能影响

doi:10.16085/j.issn.1000-6613.2022-2301

化工进展 ›› 2023, Vol. 42 ›› Issue (11): 5738-5746.DOI: 10.16085/j.issn.1000-6613.2022-2301

阳离子表面活性剂喷涂对ZnMg棒状双金属氢氧化物电催化还原CO₂产CO性能影响

李鑫彤¹(), 刘天霞¹^,²(), 刘二瑞¹, 张亚萍³

^1.北方民族大学化学与化学工程学院，宁夏银川 750021
^2.北方民族大学宁夏太阳能化学转化技术重点实验室，宁夏银川 750021
^3.西南科技大学材料与化学学院，四川绵阳 621010

收稿日期:2022-12-11 修回日期:2023-05-27 出版日期:2023-11-20 发布日期:2023-12-15
通讯作者: 刘天霞
作者简介:李鑫彤（1997—），男，硕士研究生，研究方向为CO2电催化还原。E-mail：lixintong525@163.cn。
基金资助:
国家自然科学基金(U20A20125)

Effect of cationic surfactant spraying on electrocatalytic reduction of carbon dioxide to carbon monoxide by ZnMg rod bimetallic hydroxides

LI Xintong¹(), LIU Tianxia¹^,²(), LIU Errui¹, ZHANG Yaping³

^1.School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, Ningxia, China
^2.Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, Ningxia, China
^3.School of Materials Science and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China

Received:2022-12-11 Revised:2023-05-27 Online:2023-11-20 Published:2023-12-15
Contact: LIU Tianxia

摘要/Abstract

摘要：

CO₂还原电催化剂已成为近几年催化领域的研究热点，但CO₂还原常伴随着竞争析氢反应，这直接导致了能源的浪费。本文通过水热合成制备出一种高效还原CO₂为CO的锌镁双金属氢氧化合物[ZnMg(OH)₄]，并引入阳离子表面活性剂来抑制析氢副反应。以ZnMg(OH)₄为载体通过喷涂法将阳离子表面活性剂十六烷基三甲基溴化铵（C₁₉H₄₂BrN，CTAB）涂覆在催化剂表面，形成ZnMg(OH)₄-CTAB复合催化剂，并对催化剂的晶体结构、形貌进行表征，通过一系列电化学测试对催化剂电催化CO₂还原性能进行评估。在电势-1.5V（vs. RHE）下，表面涂覆阳离子表面活性剂CTAB能使样品的CO法拉第效率从78.2%提高至87.25%。结果表明，在催化剂表面涂覆阳离子表面活性剂形成的复合催化剂ZnMg(OH)₄-CTAB具有较高的CO₂还原性能，这与阳离子表面活性剂和双金属氢氧化物的协同效应有关。

关键词: 二氧化碳, 一氧化碳, 表面活性剂, 析氢反应, 催化剂

Abstract:

The electrocatalysts of CO₂ reduction have become a hot research topic in catalysis in recent years, but CO₂ reduction is often accompanied by competing hydrogen evolution reactions, which directly lead to energy wastage. In this paper, a zinc-magnesium bimetallic hydroxide [ZnMg(OH)₄] with high efficiency in reducing CO₂ to CO was prepared by hydrothermal synthesis, and a cationic surfactant was introduced to inhibit the hydrogen evolution reactions. ZnMg(OH)₄ was used as the carrier to coat the cationic surfactant cetyl trimethl ammonium bromide(C₁₉H₄₂BrN,CTAB) by spraying method to form ZnMg(OH)₄-CTAB composite catalyst. The crystal structure and morphology of the catalyst were also characterized, and the electrocatalytic CO₂ reduction electrochemical tests. At a potential of -1.5V (vs. RHE), surface coating with a cationic surfactant increases the performance of the catalyst was evaluated by a series of CO Faraday efficiency of the sample from 78.2% to 87.25%. The results showed that the composite catalyst ZnMg(OH)₄-CTAB formed by coating a cationic surfactant on the catalyst surface has excellent carbon dioxide reduction performance, which was related to the synergistic effect of the cationic surfactant and bimetallic hydroxide.

Key words: carbon dioxide, carbon monoxide, surfactants, hydrogen evolution reaction, catalyst

中图分类号:

TQ151.5

李鑫彤, 刘天霞, 刘二瑞, 张亚萍. 阳离子表面活性剂喷涂对ZnMg棒状双金属氢氧化物电催化还原CO₂产CO性能影响[J]. 化工进展, 2023, 42(11): 5738-5746.

LI Xintong, LIU Tianxia, LIU Errui, ZHANG Yaping. Effect of cationic surfactant spraying on electrocatalytic reduction of carbon dioxide to carbon monoxide by ZnMg rod bimetallic hydroxides[J]. Chemical Industry and Engineering Progress, 2023, 42(11): 5738-5746.

图/表 9

图1 ZnMg(OH)4的XRD衍射图谱

图2 ZnMg(OH)4、ZnMg(OH)4-CTAB、CTAB的红外光谱

图3 ZnMg(OH)4、ZnMg(OH)4-CTAB的XPS光谱

图4 ZnMg(OH)4的SEM图像和TEM图像

图5 ZnMg(OH)4、ZnMg(OH)4-CTAB、ZnMg(OH)4-CTAC、ZnMg(OH)4-KBr在不同电位下的FECO折线图

图6 ZnMg(OH)4和ZnMg(OH)4-CTAB的电化学性能测试

图7 ZnMg(OH)4-CTAB在-1.7V恒电压下的循环稳定性

图8 施加负电势后阴极表面的双电层

图9 CTAB辅助ZnMg(OH)4还原CO2的机理

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阳离子表面活性剂喷涂对ZnMg棒状双金属氢氧化物电催化还原CO₂产CO性能影响

Effect of cationic surfactant spraying on electrocatalytic reduction of carbon dioxide to carbon monoxide by ZnMg rod bimetallic hydroxides

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