催化作用
质子交换膜燃料电池
电催化剂
X射线光电子能谱
乙二醇
化学工程
纳米颗粒
材料科学
氧化物
甲醇
铂金
化学
纳米技术
电化学
冶金
电极
有机化学
物理化学
工程类
作者
Ziyu Wang,Xuekun Jin,Fengjuan Chen,Shiya Bian,Junhua Li,Jianjun Chen
标识
DOI:10.1021/acsaenm.3c00002
摘要
Pt/C catalyst is a crucial cathode material in proton exchange membrane fuel cells (PEMFCs), but its low stability limits its use in fuel cells. In this study, smaller Pt nanoparticles (NPs) were strongly anchored to the surface of regenerated decolorizing powder charcoal (PC) using MnO2 as an additive (Pt/M-PC), which was synthesized by the ethylene glycol reduction method. Benefiting from the strong anchored structure, the Pt/M-PC exhibits excellent stability. Notably, 77% of activity can be maintained by Pt/M-PC during the stability test of 12 h, which was higher than that of Pt/powder charcoal (Pt/PC, 68%). Moreover, Pt/M-PC (13.1 wt %) also showed higher mass activity than commercial Pt/C. XPS results showed that Pt NPs had a stronger interaction with PC when MnO2 was used as an additive, thereby decreasing the agglomeration degree of Pt NPs in the catalytic reaction due to the strong anchoring. In addition, the interaction between Pt NPs and PC increases the local electron density of Pt NPs, which is beneficial to improve the bonding strength of Pt NPs and oxygenated intermediates, ensuring the numbers of active sites and then enhancing the stability. As a result, this kind of metal oxide as additive may be an effective strategy for designing highly stable Pt-based catalysts.
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