吸电子和亲水性Co-卟啉促进电催化氧还原反应的研究

doi:10.13208/j.electrochem.2214002

摘要/Abstract

摘要：

研究影响电催化氧还原反应活性的因素对于合理设计高效的氧还原反应催化剂至关重要。调节催化剂电子结构通常被用于精确调控电催化氧还原反应活性。然而, 该反应发生在液/气/固界面, 很少有报道调控分子催化剂的亲疏水性来提高其催化活性。在此, 我们报道了两种钴卟啉NO₂-CoP（5,10,15,20-四（4-硝基苯基）钴卟啉）和5F-CoP（5,10,15,20-四（五氟苯基）钴卟啉）并研究了其电催化氧还原反应性能。通过同时调控meso-位取代基的电子结构和亲水性能, NO₂-CoP显示出比5F-CoP更高的电催化氧还原反应活性, 其半波电位向阳极方向移动近60 mV。NO₂-CoP比5F-CoP具有更好的亲水性。理论计算表明, NO₂-CoP比5F-CoP更容易有效地与O₂分子结合形成Co^III-O₂^·-。这项工作提供了一个简单而有效的策略, 通过使用吸电子和亲水取代基来提高钴卟啉的氧还原反应活性。该策略对于设计和开发其他用于电催化的分子催化剂体系也具有重要的启发意义。

关键词: 分子电催化, 氧还原反应, 钴卟啉, 亲水性, 电子结构

Abstract:

Understanding factors that influence the catalyst activity for oxygen reduction reaction (ORR) is essential for the rational design of efficient ORR catalysts. Regulating catalyst electronic structure is commonly used to fine-tune electrocatalytic ORR activity. However, modifying the hydrophilicity of catalysts has been rarely reported to improve ORR, which happens at the liquid/gas/solid interface. Herein, we report on two Co porphyrins, namely, NO₂-CoP (Co complex of 5,10,15,20-tetrakis(4-nitrophenyl)porphyrin) and 5F-CoP (Co complex of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin), and their electrocatalytic ORR features. By simultaneously controlling the electronic structure and hydrophilic property of the meso-substituents, the NO₂-CoP showed higher electrocatalytic activity than the 5F-CoP by shifting the ORR half-wave potential to the anodic direction by 60 mV. Compared with the 5F-CoP, the complex NO₂-CoP was more hydrophilic. Theoretical calculations suggest that NO₂-CoP is also more efficient than 5F-CoP to bind with an O₂ molecule to form Co^III-O₂^·-. This work provides a simple but an effective strategy to improve ORR activity of Co porphyrins by using electron-withdrawing and hydrophilic substituents. This strategy will be also valuable for the design of other ORR molecular electrocatalysts.

Key words: molecular electrocatalysis, oxygen reduction, Co porphyrin, hydrophilicity, electronic structure

郭鸿波, 王亚妮, 郭凯, 雷海涛, 梁作中, 张学鹏, 曹睿. 吸电子和亲水性Co-卟啉促进电催化氧还原反应的研究[J]. 电化学（中英文）, 2022, 28(9): 2214002.

Hong-Bo Guo, Ya-Ni Wang, Kai Guo, Hai-Tao Lei, Zuo-Zhong Liang, Xue-Peng Zhang, Rui Cao. A Co Porphyrin with Electron-Withdrawing and Hydrophilic Substituents for Improved Electrocatalytic Oxygen Reduction[J]. Journal of Electrochemistry, 2022, 28(9): 2214002.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.13208/j.electrochem.2214002

https://electrochem.xmu.edu.cn/CN/Y2022/V28/I9/2214002

图/表 6

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