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.

模板化油菜籽压榨饼基材料作为高效氧还原反应电催化剂
菜籽油压榨饼是菜籽油生产的一种廉价副产物,用于制备含过渡金属氮掺杂的碳基模板催化剂,用于电化学氧还原反应(ORR)。双氰胺和硝酸铁(III)作为氮和金属源,醋酸镁作为硬模板的前体。电催化剂在0.1 M KOH溶液中表现出较高的ORR电催化活性,其活性超过了20% Pt/C的市售电催化活性。ORR活性的增加可能归因于材料形态的改善;根据氮气物理吸附分析,与未模板化的材料相比,最佳催化剂材料的比表面积增加了20%,气孔总量增加了近50%。在阴离子交换膜燃料电池(AEMFC)测试中,该催化剂作为正极材料表现出良好的性能,最大功率密度达到355 mW cm-2。利用菜籽油生产副产物制备阴离子交换膜燃料电池(AEMFC)阴极活性催化剂材料。
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