对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H<sub>2</sub>O<sub>2</sub>的催化活性

引用本文: 王毅, 易秘, 王昆, 宋树芹. 对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H₂O₂的催化活性[J]. 催化学报, 2019, 40(4): 523-533. doi: S1872-2067(19)63314-0 shu

Citation: Yi Wang, Mi Yi, Kun Wang, Shuqin Song. Enhanced electrocatalytic activity for H₂O₂ production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes[J]. Chinese Journal of Catalysis, 2019, 40(4): 523-533. doi: S1872-2067(19)63314-0 shu

对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H₂O₂的催化活性

王毅 ^a, ,
易秘 ^a, ,
王昆 ^b, ,
宋树芹 ^b,

a 中山大学化学工程与技术学院, 广东省低碳化学与过程节能重点实验室, 广东珠海 519082;
b 中山大学材料科学与工程学院, 广东广州 510275
基金项目:
国家自然科学基金（21576299，21576300）；广州科技计划项目（201607010104，201707010079）；广东省省级科技计划项目（2017A050501009）；国家重点研发计划（2016YFB0101204）；广东省高层次人才特殊支持计划项目（2016TQ03N322）；高校基本科研业务费青年教师重点培育项目（17lgzd14）.

摘要: 双氧水（H₂O₂）是一种重要的化工原料.目前，其工业生产主要采用蒽醌法，但工艺复杂、能耗高，同时高浓度H₂O₂不宜储存和远距离运输.电催化氧气二电子还原（ORR）制备H₂O₂技术具有绿色环保、工艺简单等优点，且可实现H₂O₂的原位生产，受到了广泛关注.开发高效、廉价的非贵金属催化剂是ORR制备H₂O₂技术的关键.多壁碳纳米管（MWCNTs）作为一种便宜易得、稳定环保的常用催化材料，具有一定的ORR催化活性，本文对MWCNTs进行表面氧化处理，通过优化氧化处理的条件调控其结构和表面的含氧官能团含量，提高MWCNTs电催化ORR制H₂O₂的性能.
物化表征结果表明，随着氧化处理温度的上升或时间的延长，MWCNTs的结构从外到内逐渐被破坏，管壁表面对2e^-路径ORR具有催化活性的缺陷和含氧官能团含量逐渐增加.但随着氧化程度进一步加深，MWCNTs的管壁被严重破坏，材料导电能力显著降低，从而不利于电催化ORR的进行.电化学测试结果表明，在所有的氧化MWCNTs样品中，O-CNTs-40-1（40℃，氧化处理1 h）电流最大，相比未经处理的商业化MWCNTs的ORR起始还原电位正移最明显.而且催化ORR制H₂O₂的选择性提升幅度也最大，其中双氧水产率从约30%提升至50%左右，反应转移电子数则从3.4降低至3.0.电化学阻抗谱结果表明，O-CNTs-40-1具有最佳导电能力.将O-CNTs-40-1负载到聚四氟乙烯处理过的碳纸（CP）上作为电极，用于0.1mol L^-1 KOH溶液中电催化ORR生成H₂O₂的实验结果显示，恒电位0.46V（vs. RHE）40min，CP@O-CNTs-40-1电极的H₂O₂累积浓度为64.8mg L^-1，而CP@MWCNTs电极对应的浓度仅为39.4mg L^-1.且CP@O-CNTs-40-1电极在H₂O₂累积过程中对应的电流效率达到52%-65%.这表明比未经调控的MWCNTs，经过精准调控结构和组成之后的O-CNTs-40-1更加适合用作电催化ORR原位制备H₂O₂的催化剂.
通过精确调控结构和组成之后，MWCNTs外层断裂腐蚀而内层结构完好，使其同时具备足够的催化2e^-路径ORR活性位点和良好的导电能力，因而大幅提高了电催化ORR制备H₂O₂的性能.这为进一步探索优化设计碳基材料的结构，提升催化剂电催化ORR原位制备H₂O₂的性能提供了一种有用的思路.

关键词:

English

Enhanced electrocatalytic activity for H₂O₂ production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes

Yi Wang ^a, ,
Mi Yi ^a, ,
Kun Wang ^b, ,
Shuqin Song ^b,

a The Key Lab of Low-carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, Guangdong, China;
b School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
Received Date: 25 December 2018
Revised Date: 18 January 2019
Fund Project:
This work was supported by the National Natural Science Foundation of China (21576299, 21576300), Guangzhou Science and Technology Project (201607010104, 201707010079), Science and Technology Planning Project of Guangdong Province (2017A050501009), the National Key Research and Development Program of China (2016YFB0101204), Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program (2016TQ03N322), and the fundamental Research Funds for Central Universities (17lgzd14).

Abstract: Hydrogen peroxide (H₂O₂) is a very useful chemical reagent, but the current industrial methods for its production suffer from serious energy consumption problems. Using high-activity and high-selectivity catalysts to electrocatalyze the oxygen reduction reaction (ORR) through a two-electron (2e^-) pathway is a very promising route to produce H₂O₂. In this work, we obtained partially oxidized multi-walled carbon nanotubes (MWCNTs) with controlled structure and composition by oxidation with concentrated sulfate and potassium permanganate at 40℃ for 1 h (O-CNTs-40-1). The outer layers of O-CNTs-40-1 are damaged with defects and oxygen-containing functional groups, while the inner layers are maintained intact. The optimized structure and composition of the partially oxidized MWCNTs ensure that O-CNTs-40-1 possesses both a sufficient number of catalytic sites and good conductivity. The results of rotating ring disk electrode measurements reveal that, among all oxidized MWCNTs, O-CNTs-40-1 shows the greatest improvement in hydrogen peroxide selectivity (from~30% to~50%) and electron transfer number (from~3.4 to~3.0) compared to those of the raw MWCNTs. The results of electrochemical impedance spectroscopy measurements indicate that both the charge-transfer and intrinsic resistances of O-CNTs-40-1 are lower than those of the raw MWCNTs and of the other oxidized MWCNTs. Finally, direct tests of the H₂O₂ production confirm the greatly improved catalytic activity of O-CNTs-40-1 relative to that of the raw MWCNTs.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H₂O₂的催化活性

English

Enhanced electrocatalytic activity for H₂O₂ production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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中国化学会秘书处

对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H2O2的催化活性

English

Enhanced electrocatalytic activity for H2O2 production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

对多壁碳纳米管的结构和组成进行精细调控提高其电催化氧还原反应制H₂O₂的催化活性

Enhanced electrocatalytic activity for H₂O₂ production by the oxygen reduction reaction: Rational control of the structure and composition of multi-walled carbon nanotubes

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs