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Issue 43, 2015
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Metallated porphyrin based porous organic polymers as efficient electrocatalysts

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Abstract

Developing efficient, stable and low-cost catalysts for Oxygen Reduction Reaction (ORR) is of great significance to many emerging technologies including fuel cells and metal–air batteries. Herein, we report the development of a cobalt(II) porphyrin based porous organic polymer (CoPOP) and its pyrolyzed derivatives as highly active ORR catalysts. The as-synthesized CoPOP exhibits high porosity and excellent catalytic performance stability, retaining ∼100% constant ORR current over 50 000 s in both alkaline and acidic media. Pyrolysis of CoPOP at various temperatures (600 °C, 800 °C, and 1000 °C) yields the materials consisting of graphitic carbon layers and cobalt nanoparticles, which show greatly enhanced catalytic activity compared to the as-synthesized CoPOP. Among them, CoPOP-800/C pyrolyzed at 800 °C shows the highest specific surface area and ORR activity, displaying the most positive half-wave potential (0.825 V vs. RHE) and the largest limited diffusion current density (5.35 mA cm−2) in an alkaline medium, which are comparable to those of commercial Pt/C (20 wt%) (half-wave potential 0.829 V vs. RHE, limited diffusion current density 5.10 mA cm−2). RDE and RRDE experiments indicate that CoPOP-800/C directly reduces molecular oxygen to water through a 4-e pathway in both alkaline and acidic media. More importantly, CoPOP-800/C exhibits excellent durability and methanol-tolerance under acidic and alkaline conditions, which surpass the Pt/C (20 wt%) system.

Graphical abstract: Metallated porphyrin based porous organic polymers as efficient electrocatalysts

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Supplementary files

Article information


Submitted
06 Aug 2015
Accepted
12 Sep 2015
First published
08 Oct 2015

Nanoscale, 2015,7, 18271-18277
Article type
Paper

Metallated porphyrin based porous organic polymers as efficient electrocatalysts

G. Lu, Y. Zhu, K. Xu, Y. Jin, Z. J. Ren, Z. Liu and W. Zhang, Nanoscale, 2015, 7, 18271
DOI: 10.1039/C5NR05324B

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