Electrocatalytic Effects of Carbon Dissolution in Pd Nanoparticles
- Electrocatalytic Effects of Carbon Dissolution in Pd Nanoparticles
- 전태열; 유성종; 박희영; 김상경; 임성엽; 백동현; 정두환; 성영은
- Issue Date
- VOL 28, NO 7, 3664-3670
- Highly dispersed Pd nanoparticles were prepared
by borohydride reduction of Pd(acac)2 in 1,2-propanediol at an
elevated temperature. They were uniformly dispersed on carbon
black without significant aggregation. X-ray diffraction showed
that carbons from the Pd precursor dissolved in Pd, increasing
its lattice parameter. A modified reduction process was tested to
remove the carbon impurities. Carbon removal greatly enhanced
catalytic activity toward the oxygen reduction reaction. It also
generated an inconsistency between the electronic modifications
obtained from X-ray photoelectron spectroscopy and the electrochemical method. CO displacement measurements showed that
the formation of Pd−C bonds decreased the work function of the surface Pd atoms.
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