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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Remarkably enhanced catalytic activity by the synergistic effect of palladium single atoms and palladium-cobalt phosphide nanoparticles

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Title
Remarkably enhanced catalytic activity by the synergistic effect of palladium single atoms and palladium-cobalt phosphide nanoparticles
Author
Tiwari, Jitendra N.Dang, Ngoc KimPark, Hyo JuSultan, SirajKim, Min GyuHaiyan, JinLee, ZonghoonKim, Kwang S.
Issue Date
2020-12
Publisher
ELSEVIER
Citation
NANO ENERGY, v.78, pp.105166
Abstract
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-PdSAs@GO). 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 PdSAs@GO surface to shift the Pd d-band center promotes the bimetallic catalyst activity. The strong binding of PdSAs@GO with metals and the phosphide ligand stabilized NPs provide longterm 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.
URI
https://scholarworks.unist.ac.kr/handle/201301/49995
URL
https://www.sciencedirect.com/science/article/pii/S2211285520307448?via%3Dihub
DOI
10.1016/j.nanoen.2020.105166
ISSN
2211-2855
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CHM_Journal Papers
MSE_Journal Papers
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