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首页> 外文期刊>Electrocatalysis >Non-precious Metal Oxygen Reduction Reaction Catalysts Synthesized Via Cyanuric Chloride and N-Ethylamine
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Non-precious Metal Oxygen Reduction Reaction Catalysts Synthesized Via Cyanuric Chloride and N-Ethylamine

机译：氰尿酰氯和N-乙胺合成的非贵金属氧还原反应催化剂

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摘要

Non-precious metal oxygen reduction reaction catalysts were synthesized in this study using novel and cheap nitrogen sources, cyanuric chloride, and N-ethylamine. These materials presented a promising catalytic activity toward the oxygen reduction reaction (ORR) in acid media, which is the most challenging. For the catalyst based on N-ethylamine, the onset potential for ORR is 0.803 V vs reversible hydrogen electrode (RHE) or 0.703 V at 0.1 mA cm~(-2). The nitrogen source is shown to be extremely important in the final morphology and ORR activity of the catalyst. Steady state ORR polarizations evidenced that the final morphology of the catalysts play a major rule on mass transport in this class of catalysts, with a lamella-like structure being detrimental. Physical characterizations of the catalysts revealed that cyanuric chloride promotes morphology alterations to the carbon support toward a lamella-like structure, while the catalysts synthesized from N-ethylamine retained the nano-particle structure of the carbon precursor. This catalyst exhibited a Tafel slope of 66 mV per current decade in the lower potential region, with promising four-electron selectivity in a polymer electrolyte fuel cell (PEFC) operational potential.
机译：在这项研究中，使用新型廉价的氮源，氰尿酰氯和N-乙胺合成了非贵金属氧还原反应催化剂。这些材料对酸性介质中的氧还原反应（ORR）表现出有希望的催化活性，这是最具挑战性的。对于基于N-乙胺的催化剂，相对于可逆氢电极（RHE），ORR的起始电位为0.803 V，在0.1 mA cm〜（-2）时为0.703V。氮源在催化剂的最终形态和ORR活性方面显示出极其重要的作用。稳态ORR极化表明，这类催化剂对催化剂的最终形态起着重要的传质作用，而层状结构是有害的。催化剂的物理特征表明，氰尿酰氯促进了碳载体向薄片状结构的形态变化，而由N-乙胺合成的催化剂保留了碳前体的纳米颗粒结构。该催化剂在较低的电势区域中每十年出现一次Tafel斜率，为66 mV，在聚合物电解质燃料电池（PEFC）的工作电势中具有有希望的四电子选择性。

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