纳米材料基催化剂
催化作用
纳米颗粒
铂金
电催化剂
铂纳米粒子
氧还原反应
产量(工程)
化学
氧还原
材料科学
化学工程
纳米技术
电化学
物理化学
电极
有机化学
冶金
工程类
作者
Yining Dong,He Li,Xuanhao Mei,Ce Han,Xue Gong,Ping Song,Weilin Xu
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2024-06-20
卷期号:7 (13): 5352-5358
被引量:2
标识
DOI:10.1021/acsaem.4c00073
摘要
Traditional Pt/C is the most classic electrocatalyst for the oxygen reduction reaction (ORR) in fuel cells, in which the ORR mechanism is generally understood based on Pt nanoparticles alone. Here, based on the revealed fact of the inevitable coexistence of Pt nanoparticles and single atoms on such Pt/C, via density functional theoretical calculation, the pathways for the ORR process have been revealed: besides the known pathways on isolated Pt nanoparticles and single atoms, the other two pathways with enhanced ORR performance occur on neighboring Pt nanoparticles and single atoms due to their unique synergetic effects with the enhanced four-electron pathway by decreasing the H2O2 yield. Inspired by such insights, the mass ratio between Pt nanoparticles and single atoms was optimized to maximize their synergetic effect, which yielded an optimal hybrid Pt/C with Pt 8.0 wt % (5 wt % Pt SAs with 3 wt % Pt NPs). This mixture exhibited remarkable ORR performance on the same level as Pt/C with Pt 20 wt %, achieving a huge enhancement in Pt utilization. Such work deepens the understanding of the catalytic ORR mechanism of traditional Pt/C and can guide the design of Pt- or other precious-metal-based nanocatalysts with a high performance/price ratio for all kinds of energy processes.
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