Liu Hui, Li Chengyin, Chen Dong, Cui Penglei, Ye Feng, Yang Jun
State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Center for Mesoscience, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
Sci Rep. 2017 Sep 12;7(1):11421. doi: 10.1038/s41598-017-10223-2.
Alloying platinum (Pt) with suitable transition metals is effective way to enhance their catalytic performance for methanol oxidation reaction, and reduce their cost at mean time. Herein, we report our investigation on the synthesis of bimetallic platinum-cobalt (PtCo) alloy nanoparticles, their activation, as well as the catalytic evaluation for methanol oxidation reaction. The strategy starts with the synthesis of PtCo alloy nanoparticles in an organic medium, followed by loading on carbon substrates. We then remove the capping agent by refluxing the carbon-supported PtCo particles in acetic acid before electrochemical measurements. We emphasize the change in composition of the alloys during refluxing process, and the initial PtCo alloys with Pt/Co ratio of 1/2 turns into stable alloys with Pt/Co ratio of 3/1. The final PtCo particles have uniform distribution on carbon substrates, and exhibit activity with 2.4 and 1.5 times of that for commercial Pt/C and PtRu/C for methanol oxidation reaction.
将铂（Pt）与合适的过渡金属合金化是提高其甲醇氧化反应催化性能并同时降低成本的有效方法。在此，我们报告了我们对双金属铂钴（PtCo）合金纳米颗粒的合成、活化以及甲醇氧化反应催化评估的研究。该策略首先在有机介质中合成PtCo合金纳米颗粒，然后负载在碳载体上。在进行电化学测量之前，我们通过在乙酸中回流碳负载的PtCo颗粒来去除封端剂。我们强调了回流过程中合金成分的变化，初始Pt/Co比为1/2的PtCo合金转变为Pt/Co比为3/1的稳定合金。最终的PtCo颗粒在碳载体上分布均匀，并且在甲醇氧化反应中表现出的活性分别是商业Pt/C和PtRu/C的2.4倍和1.5倍。
