A Co Porphyrin with Electron-Withdrawing and Hydrophilic Substituents for Improved Electrocatalytic Oxygen Reduction

Authors

Hong-Bo Guo, Key Laboratory for Colloid and Interface Chemistry Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China;
Ya-Ni Wang, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;
Kai Guo, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;
Hai-Tao Lei, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;
Zuo-Zhong Liang, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;Follow
Xue-Peng Zhang, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;Follow
Rui Cao, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;Follow

Corresponding Author

Zuo-Zhong Liang(liangzuozhong@snnu.edu.cn);
Xue-Peng Zhang(zhangxp@snnu.edu.cn);
Rui Cao(ruicao@snnu.edu.cn)

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 CoIII-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.

Graphical Abstract

Keywords

molecular electrocatalysis, oxygen reduction, Co porphyrin, hydrophilicity, electronic structure

DOI Link

https://doi.org/10.13208/j.electrochem.2214002

Publication Date

2022-09-28

Online Available Date

2022-05-25

Revised Date

2022-05-17

Received Date

2022-04-13

Recommended Citation

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.
DOI: 10.13208/j.electrochem.2214002
Available at: https://jelectrochem.xmu.edu.cn/journal/vol28/iss9/7

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