Wang Ya, Li Lili, Shen Miao, Tang Rui, Zhou Jing, Han Ling, Zhang Xiuqing, Zhang Linjuan, Kim Guntae, Wang Jian-Qiang
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Adv Sci (Weinh). 2023 Nov;10(33):e2303693. doi: 10.1002/advs.202303693. Epub 2023 Oct 20.
MXene-supported noble metal alloy catalysts exhibit remarkable electrocatalytic activity in various applications. However, there is no facile one-step method for synthesizing these catalysts, because the synthesis of MXenes requires a strongly oxidizing environment and the preparation of platinum nanoalloys requires a strongly reducing environment and high temperatures. Hence, achieving coupling in one step is extremely challenging. In this paper, a straightforward one-step molten salt method for preparing MXene-supported platinum nanoalloy catalysts is proposed. The molten salt acts as the reaction medium to dissolve the transition metals and platinum ions at high temperatures. Transition metal ions oxidize the A-site element from its MAX precursor at high temperatures, and the resulting transition metals further reduce platinum ions to form alloys. By coupling Al oxidation and platinum ion reduction using a molten salt solvent, this method directly converts Ti AlC to a Pt-M@Ti C T catalyst (where M denotes the transition metal). It further offers the possibility of extending the Pt-M phase to binary, ternary, or quaternary platinum-containing nanoalloys and converting the Al-containing MAX phase to Ti AlC and Ti AlCN. Due to the strong interfacial interaction, the as-prepared Pt-Co@Ti C T is superior to commercial Pt/C (20 wt.%) in the hydrogen evolution reaction.
MXene负载的贵金属合金催化剂在各种应用中表现出显著的电催化活性。然而，目前尚无简便的一步法来合成这些催化剂，因为MXene的合成需要强氧化环境，而铂纳米合金的制备需要强还原环境和高温。因此，一步实现耦合极具挑战性。本文提出了一种直接的一步熔盐法来制备MXene负载的铂纳米合金催化剂。熔盐作为反应介质，在高温下溶解过渡金属和铂离子。过渡金属离子在高温下将其MAX前驱体中的A位元素氧化，生成的过渡金属进一步还原铂离子以形成合金。通过使用熔盐溶剂耦合铝氧化和铂离子还原，该方法直接将TiAlC转化为Pt-M@TiCT催化剂（其中M表示过渡金属）。它还提供了将Pt-M相扩展到二元、三元或四元含铂纳米合金，并将含铝MAX相转化为TiAlC和TiAlCN的可能性。由于强界面相互作用，所制备的Pt-Co@TiCT在析氢反应中优于商业Pt/C（20 wt.%）。
