Enhancement of Alkaline Hydrogen Oxidation Reaction of Ru-Ir Alloy Nanoparticles through Bifunctional Mechanism on Ru-Ir Pair Site
Enhancement of Alkaline Hydrogen Oxidation Reaction of Ru-Ir Alloy Nanoparticles through Bifunctional Mechanism on Ru-Ir Pair Site
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DOI：
10.1021/acsami.0c00506
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发表时间：
2020-05-20
影响因子：
9.5
通讯作者：
Satsuma, Atsushi
中科院分区：
文献类型：
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作者：
Ishikawa, Kazutomo;Ohyama, Junya;Satsuma, Atsushi
阴离子交换膜燃料电池（AEMFC）正在开发用于实际应用。然而，有必要改善氢氧化反应（HOR）在碱性条件下，以提高AEMFC的性能。在这项研究中，碳载Ru-Ir合金纳米颗粒催化剂（Ru-Ir/C）的开发，因为他们提供更高的HOR活性相比，铂基催化剂。研究了Ru-Ir/C催化剂的高氧还原增强机理，揭示了Ru/Ir表面组成对高氧还原活性的影响。结果表明，催化剂的HOR活性与Ru-Ir、Ru-Ru和Ir-Ir的表面对几率有关，而与氢结合能（HBE）无关。此外，Ru-Ir对位点被发现是高度活性的，这可以通过双功能机制促进HOR，该机制涉及Ru-Ir对分别提供反应性OH-和H物种。
Anion exchange membrane fuel cells (AEMFCs) are being developed for practical use. However, it is necessary to improve the hydrogen oxidation reaction (HOR) under alkaline conditions to enhance the performance of AEMFCs. In this study, carbon-supported Ru-Ir alloy nanoparticle catalysts (Ru-Ir/C) were developed because they offer higher HOR activity compared with the Pt-based catalysts. The mechanism of HOR enhancement on Ru-Ir/C was studied to reveal the effect of the surface composition of Ru/Ir on the HOR activity. The results showed that the HOR activity is related to the surface pair probability of Ru-Ir, Ru-Ru, and Ir-Ir but not to the hydrogen binding energy (HBE). In addition, the Ru-Ir pair site was found to be highly active, which can promote the HOR through a bifunctional mechanism that involves Ru-Ir pairs providing reactive OH- and H species, respectively.