Wu Xianling, Wang Dumei, Kang Xueming, Zhang Dongtang, Yan Yong, Guo Guangsheng, Sun Zaicheng, Wang Xiayan
Center of Excellence for Environmental Safety and Biological Effects, Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Biology, Beijing University of Technology, Beijing 100124, China.
Minzu University of China, Beijing 100081, China.
Nanomaterials (Basel). 2022 Apr 11;12(8):1301. doi: 10.3390/nano12081301.
The development of new synthetic methods for methanol-tolerant catalysts with improved performance is of fundamental importance for the commercialization of fuel cells. Herein, we reported a facile displacement reaction-assisted synthesis of graphene-supported sub-nanometer Pt/Bi catalysts (Pt/Bi/rGO). Bismuth (0) nanoparticles produced by NHBH reduction can be further dissolved into the ethylene glycol, implying Bi(0) has a strong interaction with the hydroxyl group. That is the key interaction between Bi(0) and the functional group on the rGO to form the ultra-small Bi/rGO catalyst. Furthermore, Pt clusters are obtained by the displacement between Bi(0) and HPtCl and are directly anchored to the rGO surface. The as-synthesized Pt/Bi/rGO catalyst exhibits high oxygen reduction mass activity and high tolerance to methanol poisoning. In the presence of 0.5 mol/L CHOH, the initial potential and activity of ORR were almost unchanged, which demonstrated great potential in the application of direct methanol fuel cells.
开发具有更高性能的耐甲醇催化剂的新合成方法对于燃料电池商业化至关重要。在此,我们报道了一种简便的置换反应辅助合成石墨烯负载的亚纳米Pt/Bi催化剂(Pt/Bi/rGO)的方法。由NHBH还原产生的铋(0)纳米颗粒可进一步溶解于乙二醇中,这意味着Bi(0)与羟基有很强的相互作用。这是Bi(0)与rGO上的官能团形成超小Bi/rGO催化剂的关键相互作用。此外,通过Bi(0)与HPtCl之间的置换获得Pt簇,并直接锚定在rGO表面。所合成的Pt/Bi/rGO催化剂表现出高的氧还原质量活性和对甲醇中毒的高耐受性。在0.5 mol/L CH₃OH存在下,ORR的初始电位和活性几乎不变,这表明其在直接甲醇燃料电池应用中具有巨大潜力。