Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction
Li, Jian1,2; Yin, Hui-Ming1,2; Li, Xi-Bo3; Okunishi, Eiji4; Shen, Yong-Li1,2; He, Jia1,2; Tang, Zhen-Kun3; Wang, Wen-Xin1,2; Yucelen, Emrah5; Li, Chao1,2; Gong, Yue6; Gu, Lin6; Miao, Shu7; Liu, Li-Min3; Luo, Jun1,2; Ding, Yi1,2
Source PublicationNATURE ENERGY
Indexed BySCI
WOS HeadingsScience & Technology ; Technology
WOS SubjectEnergy & Fuels ; Materials Science, Multidisciplinary
WOS Research AreaEnergy & Fuels ; Materials Science
AbstractCore- shell nanocatalysts have demonstrated potential as highly active low-Pt fuel cell cathodes for the oxygen reduction reaction (ORR); however, challenges remain in optimizing their surface and interfacial structures, which often exhibit undesirable structural degradation and poor durability. Here, we construct an unsupported nanoporous catalyst with a Pt- Pd shell of sub-nanometre thickness on Au, which demonstrates an initial ORR activity of 1.140Amg(Pt)(-1) at 0.9V. The activity increases to 1.471Amg(Pt)(-1) after 30,000 potential cycles and is stable over a further 70,000 cycles. Using aberration-corrected scanning transmission electron microscopy and atomically resolved elemental mapping, the origin of the activity change is revealed to be an atomic-scale evolution of the shell from an initial Pt-Pd alloy into a bilayer structure with a Pt-rich trimetallic surface, and finally into a uniform and stable Pt-Pd-Au alloy. This Pt-Pd-Au alloy possesses a suitable configuration for ORR, giving a relatively low free energy change for the final water formation from adsorbed OH intermediate during the reaction.
WOS IDWOS:000411264300018
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Cited Times:72[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Adv Funct Porous Mat, Tianjin 300384, Peoples R China
2.Tianjin Univ Technol, Sch Mat Sci & Engn, Ctr Electron Microscopy, Tianjin 300384, Peoples R China
3.Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China
4.JEOL Ltd, 1-2 Musashino,3 Chome Akishima, Tokyo 1968558, Japan
5.FEI Co BV, NanoPort Europe, POB 80066, NL-5600 KA Eindhoven, Netherlands
6.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
7.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Li, Jian,Yin, Hui-Ming,Li, Xi-Bo,et al. Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction[J]. NATURE ENERGY,2017,2(8).
APA Li, Jian.,Yin, Hui-Ming.,Li, Xi-Bo.,Okunishi, Eiji.,Shen, Yong-Li.,...&Ding, Yi.(2017).Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction.NATURE ENERGY,2(8).
MLA Li, Jian,et al."Surface evolution of a Pt-Pd-Au electrocatalyst for stable oxygen reduction".NATURE ENERGY 2.8(2017).
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