Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, People's Republic of China.
Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
Nano Lett. 2023 Jun 28;23(12):5467-5474. doi: 10.1021/acs.nanolett.3c00528. Epub 2023 Jun 7.
Phase engineering of Pt-based intermetallic catalysts has been demonstrated as a promising strategy to optimize catalytic properties for a direct formic acid fuel cell. Pt-Bi intermetallic catalysts are attracting increasing interest due to their high catalytic activity, especially for inhibiting CO poisoning. However, the phase transformation and synthesis of intermetallic compounds usually occurring at high temperatures leads to a lack of control of the size and composition. Here, we report the synthesis of intermetallic β-PtBi and γ-PtBi two-dimensional nanoplates with controlled sizes and compositions under mild conditions. The different phases of intermetallic PtBi can significantly affect the catalytic performance of the formic acid oxidation reaction (FAOR). The obtained β-PtBi nanoplates exhibit an excellent mass activity of 1.1 ± 0.01 A mg for the FAOR, which is 30-fold higher than that of commercial Pt/C catalysts. Moreover, intermetallic PtBi demonstrates high tolerance to CO poisoning, as confirmed by infrared absorption spectroscopy.
已证实，通过 Pt 基金属间化合物催化剂的相工程来优化直接甲酸燃料电池的催化性能是一种很有前途的策略。由于其高催化活性，特别是对抑制 CO 中毒的抑制作用，Pt-Bi 金属间化合物催化剂引起了越来越多的关注。然而，金属间化合物的相转变和合成通常在高温下进行，这导致了对尺寸和组成的控制不足。在这里，我们报道了在温和条件下合成具有可控尺寸和组成的金属间化合物β-PtBi 和 γ-PtBi 二维纳米片。金属间化合物 PtBi 的不同相可以显著影响甲酸氧化反应（FAOR）的催化性能。所得到的β-PtBi 纳米片在 FAOR 中表现出 1.1±0.01 A mg 的出色质量活性，比商业 Pt/C 催化剂高 30 倍。此外，金属间化合物 PtBi 表现出对 CO 中毒的高耐受性，这一点通过红外吸收光谱得到了证实。
