Templated Rapeseed-Press-Cake-Based Materials as Efficient Oxygen Reduction Reaction Electrocatalysts

Silver Juvanen, Ave Sarapuu, Kaarel Kisand, Maike Käärik, Arvo Kikas, Jekaterina Kozlova, Alexey Treshchalov, Jaan Aruväli, Jaan Leis, Vambola Kisand, Kaupo Kukli and Kaido Tammeveski*, 
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Abstract

Rapeseed press cake, an inexpensive byproduct of rapeseed oil manufacturing, is used for the preparation of transition-metal-containing nitrogen-doped templated carbon-based catalysts for the electrochemical oxygen reduction reaction (ORR). Dicyandiamide and iron(III) nitrate are used as nitrogen and metal sources, with magnesium acetate serving as a precursor of the hard template. The electrocatalysts exhibit high ORR electrocatalytic activity in rotating disk electrode tests in 0.1 M KOH solution, with activity surpassing that of commercial 20 wt % Pt/C. This increase in the ORR activity may be attributed to improved material morphology; according to nitrogen physisorption analysis, the best catalyst material possesses 20% higher specific surface area and almost 50% larger total volume of pores compared to the untemplated material. The top-performing catalyst showed a promising performance as a cathode material in an anion-exchange membrane fuel cell (AEMFC) test, achieving a maximum power density of 355 mW cm–2.

A byproduct of rapeseed oil production was used to prepare active catalyst materials for anion-exchange membrane fuel cell (AEMFC) cathode.

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