The Key Laboratory of Fuel Cell Technology of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
Nano Lett. 2023 Jun 14;23(11):5187-5193. doi: 10.1021/acs.nanolett.3c01147. Epub 2023 Jun 5.
Intermetallic compounds, featuring atomically ordered structures, have emerged as a class of promising electrocatalysts for fuel cells. However, it remains a formidable challenge to controllably synthesize Pt-based intermetallics during the essential high-temperature annealing process as well as stabilize the nanoparticles (NPs) during the electrocatalytic process. Herein, we demonstrated a Ketjen black supported intermetallic PtTi nanocatalyst coupled with amorphous TiO species (PtTi-TiO/KB). The TiO can not only confine PtTi NPs during the synthesis and electrocatalytic process by a strong metal-oxide interaction but also promote the water dissociation for generating more OH species, thus facilitating the conversion of CO. The PtTi-TiO/KB showed a significantly enhanced mass activity (2.15 A mg) for the methanol oxidation reaction, compared with PtTi/KB and Pt/C, and presented an impressively high mass activity retention (∼71%) after the durability test. This work provides an effective strategy of coupling Pt-based intermetallics with functional oxides for developing highly performed electrocatalysts.
金属间化合物具有原子有序结构，已成为一类有前途的燃料电池电催化剂。然而，在必要的高温退火过程中可控合成基于 Pt 的金属间化合物以及在电催化过程中稳定纳米颗粒（NPs）仍然是一个巨大的挑战。在此，我们展示了一种负载在 Ketjen black 上的金属间化合物 PtTi 纳米催化剂，其与非晶态 TiO 物种（PtTi-TiO/KB）结合。TiO 不仅可以通过强金属-氧化物相互作用在合成和电催化过程中限制 PtTi NPs，还可以促进水的解离以生成更多的 OH 物种，从而促进 CO 的转化。与 PtTi/KB 和 Pt/C 相比，PtTi-TiO/KB 在甲醇氧化反应中表现出显著增强的质量活性（2.15 A mg），并且在耐久性测试后保持了令人印象深刻的高质量活性保留率（约 71%）。这项工作为开发高性能电催化剂提供了一种将基于 Pt 的金属间化合物与功能氧化物耦合的有效策略。
