Abstract
In this work, composite materials based on carbide-derived carbon (CDC) and carbon nanotubes (CNT) modified with Co phthalocyanine (CoPc) were employed as electrocatalysts towards the oxygen reduction reaction (ORR) in both alkaline and acid media. Two different CDCs derived from titanium carbide and silicon carbide were used and the CDC-to-CNT ratio was varied in the composite materials. The final catalysts were obtained after pyrolysis at 800 °C. The catalyst materials were characterised by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and microwave plasma atomic emission spectroscopy. The ORR measurements were performed using the rotating disk electrode (RDE) method. The RDE results revealed that the composite catalysts with higher CNT content possessed higher ORR electrocatalytic activity. The catalyst showing the highest activity in RDE tests was selected as a cathode material and tested in an anion exchange membrane fuel cell (AEMFC). An excellent AEMFC performance was obtained, with a peak power density of 473 mW cm−2.
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This work was supported by the Estonian Research Council grant PRG723 and by institutional research funding (IUT34-14) of the Estonian Ministry of Education and Research. This research was also supported by the EU through the European Regional Development Fund (TK141, “Advanced materials and high-technology devices for energy recuperation systems”). The fuel cell tests were partially funded by the EU Horizon 2020 research and innovation program (Grant No. 721065); by the Ministry of National Infrastructure, Energy and Water Resources of Israel (Grant No. 3-13671) and by the Melvyn & Carolyn Miller Fund for Innovation, as well as the support of Planning & Budgeting Committee / ISRAEL Council for Higher Education (CHE) and Fuel Choice Initiative (Prime Minister Office of ISRAEL), within the framework of “Israel National Research Center for Electrochemical Propulsion (INREP)”.
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This paper is dedicated to Prof. José H. Zagal on the occasion of his 70th birthday and in recognition of his contribution to the electrochemistry of transition metal macrocyclic complexes.
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Praats, R., Käärik, M., Kikas, A. et al. Electroreduction of oxygen on cobalt phthalocyanine-modified carbide-derived carbon/carbon nanotube composite catalysts. J Solid State Electrochem 25, 57–71 (2021). https://doi.org/10.1007/s10008-020-04543-z
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DOI: https://doi.org/10.1007/s10008-020-04543-z