Spontaneous formation of platinum particles on electrodeposited palladium |
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| Affiliation: | 1. State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China;2. Materials Science Institute, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, PR China;1. Research Division for Industry and Environment, Korea Atomic Energy Research Institute, Jeollabuk-do 580-185, South Korea;2. Department of Polymer Science and Engineering, Chungnam National University, Daejeon 305-764, South Korea;3. Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, South Korea;1. Center for Micro- and Nanostructures, Institute for Solid State Electronics, TU Wien, 1040 Vienna, Austria;2. Austrian Academy of Sciences, 1010 Vienna, Austria |
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| Abstract: | Pt particles have been spontaneously formed on the electrochemically deposited Pd layer on ITO substrate. SEM reveals that the Pt particles spontaneously formed on the Pd surface are uniformly distributed. The as-prepared material (denotes as Pt–Pd/ITO) as electrode shows a higher activity for ethanol oxidation than that of Pd/ITO. The mechanism is tentatively explained as that the H dehydrogenated from ethanol on Pt can efficiently spillover to the underneath Pd, resulting in an enhanced kinetics. The rapid removal of H on the Pt active sites accelerates the further adsorption of ethanol and dehydrogenation (oxidation). This work demonstrates a strategic method to spontaneous prepare small particles on the reductive species-containing substrates. The metal ion with a higher standard potential than that of hydrogen is theoretically possible to be spontaneously reduced to metal on hydrogenated Pd. |
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