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Open AccessArticle

Study on the Effects of a π Electron Conjugated Structure in Binuclear Metallophthalocyanines Graphene-Based Oxygen Reduction Reaction Catalysts

1
School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, China
2
Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry & Material Chemistry, Northwest University, Xi’an 710069, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(5), 946; https://doi.org/10.3390/nano10050946
Received: 3 April 2020 / Revised: 2 May 2020 / Accepted: 9 May 2020 / Published: 15 May 2020
(This article belongs to the Special Issue Novel Nanomaterials for Applications in Energy and Catalysis)
The high overpotentials for oxygen reduction reaction (ORR) create an extremely negative impact on the energy efficiency of the air-based battery systems. To overcome this problem, binuclear ball-type metallophthalocyanines containing methoxy substituents (M2Pc2(EP)4, M = Fe(II), Co(II) and Zn(II)) were wrapped with polystyrene sodium sulfonate (PSS) modified graphene oxide (GO), using a facilely “solvothermal π-π assembly” method to prepare M2Pc2(EP)4/PSS-Gr composites. Compared with the commercial Pt/C catalysts, the M2Pc2(EP)4/PSS-Gr composites enhanced the catalytic activity of oxygen reduction reaction. The π electron conjugated structure of the MN4-type phthalocyanine macrocyclic system strongly influenced the one-step four-electron electrocatalytic process of the M2Pc2(EP)4/PSS-Gr composites. Moreover, the π-π interactions between the M2Pc2(EP)4 and PSS-Gr dramatically enhanced the π electron density in the conjugated structure and oxygen could be reduced more easily. The electrocatalytic activity test was displayed in the order of Fe2Pc2(FP)4/PSS-Gr > Co2Pc2(EP)4/PSS-Gr > Zn2Pc2(EP)4/PSS-Gr. The results indicated that the catalytic performance of M2Pc2Rn could be enhanced by the modification of π electron conjugated structure of M2Pc2(EP)4 and carbon materials. View Full-Text
Keywords: metallophthalocyanines; PSS-Graphene; π-π interactions; ORR metallophthalocyanines; PSS-Graphene; π-π interactions; ORR
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MDPI and ACS Style

Zhang, G.; Liu, B.; Zhang, Y.; Li, T.; Chen, W.; Zhao, W. Study on the Effects of a π Electron Conjugated Structure in Binuclear Metallophthalocyanines Graphene-Based Oxygen Reduction Reaction Catalysts. Nanomaterials 2020, 10, 946.

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