催化作用
电催化剂
离解(化学)
铂金
化学
质子交换膜燃料电池
电解质
纳米颗粒
合金
无机化学
吸附
化学工程
材料科学
纳米技术
电化学
物理化学
电极
有机化学
工程类
作者
Xing Cheng,Yueshuai Wang,Yue Lu,Lirong Zheng,Shaorui Sun,Hongyi Li,Guangming Chen,Jiujun Zhang
标识
DOI:10.1016/j.apcatb.2022.121112
摘要
Reducing the usage of noble metals, such as platinum-based catalysts for oxygen reduction reaction (ORR) is pressingly demanded towards the practical applications of proton-exchange membrane fuel cells. One promising way is to develop Pt single atom catalysts (SACs), which, however, are plagued by their preference toward two-electron ORR pathway as well as stability issue. Herein, a single-atom alloy (SAA) catalyst with platinum-cobalt (Pt-Co) dual sites encapsulated in nitrogen-doped graphitized carbon nanotubes (Pt1Co100/N-GCNT) consisting of isolated Pt atoms decorated on the surface of Co nanoparticles was reported. Based on complementary spectroscopic characterizations and first-principle calculations, we propose that the unique Pt-Co dual sites in SAA facilitates the adsorption and dissociation of oxygen, particularly for the immobilization of OOH* intermediate and the dissociation of OH* intermediate, and thus result in high-efficiency four-electron ORR pathway. Consequently, the Pt1Co100/N-GCNT SAA catalyst achieves a mass activity of 0.81 A mg–1Pt at 0.90 V (versus the reversible hydrogen electrode) in 0.1 M HClO4 electrolyte, outperform commercial Pt/C catalyst for 5.4 times. The superior stability of the SAA catalyst was reflected by the results from the 30,000 potential-scanning cycles combined with the post characterization of the catalyst.
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