Platinum‐group‐metal‐free (PGM‐free) catalysts are the most promising materials to substitute expensive platinum catalysts for efficient oxygen reduction reaction (ORR), particularly for microbial fuel cells. For these devices, contamination due to wastewater is one of the major issues, owing to the presence of various poisoning anions. The known nitrite contamination effect over PGM‐free catalysts was studied by using the rotating disk electrode (RDE) technique in neutral media to understand its patterns. The results were then compared to other contaminants commonly found in wastewater such as chloride (Cl⁻), perchlorate (ClO₄⁻), and nitrate (NO₃⁻) in the concentration range of 0.05–50 mM. Onset potential (E _onset), half‐wave potential (E _1/2), limiting disk current density (J _lim) and Tafel slope variations were the parameters exploited to identify specific or nonspecific adsorbed contaminants. Chloride and nitrate had no negative effect on ORR performance, whereas perchlorate slightly reduced the catalyst function with no permanent issues. Durability tests (1000 cycles) were also performed to ensure the stability of the catalyst for the relatively long time.

中文翻译：

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活性位点中毒对在中性介质中运行的铁-氮-碳铂-基-无金属-氧还原反应催化剂的影响：转盘电极研究

不含铂族金属（PGM）的催化剂是最有希望的材料，可以代替昂贵的铂催化剂来实现有效的氧还原反应（ORR），尤其是用于微生物燃料电池。对于这些设备，由于存在各种中毒阴离子，废水污染是主要问题之一。通过在中性介质中使用旋转盘电极（RDE）技术研究了已知的亚硝酸盐污染对不含PGM的催化剂的影响，以了解其模式。然后将结果与废水中通常发现诸如氯化物（CL其他污染物^- ），高氯酸根（CLO ₄ ^- ）和硝酸（NO ₃ ^-在0.05-50毫的浓度范围）。起始电位（ē_起始），半波电势（E _1/2），极限盘电流密度（J _lim）和Tafel斜率变化是用来识别特定或非特定吸附污染物的参数。氯化物和硝酸盐对ORR性能没有负面影响，而高氯酸盐则稍微降低了催化剂功能，没有永久性问题。还进行了耐久性测试（1000次循环）以确保催化剂在较长时间内的稳定性。