In this study, novel Pt‐IrO₂ nanofiber catalysts for oxygen evolution reaction (OER) were successfully prepared using the electrospinning method with a high‐concentration precursor solution. The composition and structure of catalysts were characterized, and the electrocatalytic performance of the nanofiber catalysts in water electrolysis was investigated from various aspects such as overpotential, charge transfer resistance, and exchange current density. Special attention was paid on the effect of Pt/Ir ratio on the electrocatalytic activity of the electrospun nanofibers. The results showed that the Pt‐IrO₂ nanofiber catalysts with average fiber diameters ranging from 10 to 100 nm can be successfully obtained by the electrospinning method, and the average diameter decreased with the increase of Pt content. Since a bigger amount of IrO₂ content and a thinner fiber structure are all beneficial to the electrocatalytic performance, the Pt‐IrO₂ catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 both showed better catalytic performance for OER than the commercial IrO₂, which was also demonstrated by the lower charge transfer resistance and higher exchange current density. As a result, the overpotentials of Pt‐IrO₂ catalysts with Pt:Ir = 1:9 and Pt:Ir = 9:1 are 50 mV and 32 mV lower than the overpotential of the commercial IrO₂ at 30 mA cm⁻² in 0.5 M H₂SO₄, respectively. The electrospun Pt‐IrO₂ nanofiber catalyst with proper Pt content seems to be very promising since it can not only improve the catalytic performance and the safety of PEM electrolysis cells, but also reduce the amount of more expensive Ir in catalysts.

中文翻译：

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电纺制Pt-IrO2纳米纤维催化剂的析氧性能及电催化性能

在这项研究中，使用静电纺丝方法和高浓度的前体溶液成功地制备了用于氧释放反应（OER）的新型Pt-IrO ₂纳米纤维催化剂。表征了催化剂的组成和结构，并从超电势，电荷转移阻力和交换电流密度等多个方面研究了纳米纤维催化剂在水电解中的电催化性能。特别注意Pt / Ir比对电纺纳米纤维的电催化活性的影响。结果表明，Pt-IrO ₂静电纺丝法可成功获得平均纤维直径为10〜100 nm的纳米纤维催化剂，随着Pt含量的增加，平均纤维直径逐渐减小。由于大量的IrO ₂含量和较细的纤维结构均有利于电催化性能，因此Pt：Ir = 1：9和Pt：Ir = 9：1的Pt-IrO ₂催化剂均对OER表现出更好的催化性能。与商用IrO _2相比，电荷转移电阻更低，交换电流密度更高，也证明了这一点。结果，Pt：Ir = 1：9和Pt：Ir = 9：1的Pt-IrO ₂催化剂的超电势比商用IrO ₂的超电势低50 mV和32 mV。分别在0.5 MH ₂ SO ₄中的30 mA cm ^-2下进行。具有适当Pt含量的电纺Pt-IrO ₂纳米纤维催化剂似乎非常有前途，因为它不仅可以提高PEM电解池的催化性能和安全性，而且可以减少催化剂中更昂贵的Ir的含量。