钯
双金属片
材料科学
磷化物
催化作用
纳米颗粒
石墨烯
氧化物
钴
金属
化学工程
无机化学
纳米技术
冶金
化学
有机化学
工程类
作者
Jitendra N. Tiwari,Ngoc Kim Dang,Hyo Ju Park,Siraj Sultan,Min Kim,Haiyan Jin,Zonghoon Lee,Kwang S. Kim
出处
期刊:Nano Energy
[Elsevier]
日期:2020-12-01
卷期号:78: 105166-105166
被引量:56
标识
DOI:10.1016/j.nanoen.2020.105166
摘要
For the realization of commercially viable ethanol fuel cells, despite much safer than hydrogen gas, it is necessary to develop stable high-performance catalysts for ethanol electro-oxidation reaction (EOR). Unfortunately, current EOR catalysts are far from the expectation and suffer from fast activity degradation. Here we report palladium-cobalt phosphide (Pd–Co2P) nanoparticles (NPs) with Pd single atoms (PdSAs) anchored on graphene oxide (GO) (denoted as Pd–Co2P–[email protected]). Its EOR mass activity (10,520 mA/mgPd) is remarkably larger than any reported carbon-based precious metal catalysts including the benchmark Pd/C catalyst. To achieve high activity and stability, we systematically designed the catalyst with optimized elements ratio (Pd, Co/Ni/Fe, and P) and pyrolysis temperature together with electrochemical activation. The synergistic effect of charge-transfer between Pd and Co2P coexisting on the [email protected] surface to shift the Pd d-band center promotes the bimetallic catalyst activity. The strong binding of [email protected] with metals and the phosphide ligand stabilized NPs provide long-term durability. In-situ Raman analysis reveals that Co2P plays major roles in eliminating poisoning CO at neighboring Pd sites and retaining the catalytic activity even after 20 h.
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