Invalidation analysis of Ag@Pt core-shell nanoparticle catalysts in the electrocatalytic process
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摘要: 通過種子生長法和自組裝技術合成Ag@Pt核殼結構納米粒子(以下簡稱Ag@Pt粒子),測量和比較在電催化循環伏安掃描(以下簡稱CV掃描)過程中失效前后的Ag@Pt粒子對甲醇的電催化性能的變化,采用透射電鏡、高分辨電鏡、X射線光電子能譜等方法研究其失效機理.結果表明:Ag@Pt粒子在循環伏安掃描的過程中會發生空化現象,其臨界電壓為0.5 V,空化現象隨時間的增長而變得明顯;Ag@Pt粒子空化后形成由Ag包覆空心Pt殼的納米粒子,這是導致其在對甲醇進行電催化氧化過程中催化性能明顯下降的原因.Abstract: Ag@Pt core-shell nanoparticles(Ag@Pt NPs) composed of an Ag nanoparticle core and a Pt shell were prepared by the seed-mediated growth method and self-assembly technology. The electrocatalytic properties of Ag@Pt NPs to methanol before and after invalidation were measured and compared during the electrocatalytic process. The invalidation mechanism was studied by transmission electron microscopy,high-resolution electron microscopy,and X-ray photoelectron spectroscopy. The results show that the cavitation phenomena of Ag@Pt NPs occur during the cyclic voltammetry process with a threshold voltage of 0.5 V and become more obvious with the increase of time. Ag@Pt particles turn into Pt hollow shells coated by Ag after cavitation,which is the reason that the catalytic property of Ag@Pt NPs to methanol distinctly decreases during the electrocatalytic process.
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Key words:
- nanocomposites /
- nanoparticles /
- catalysts /
- invalidation /
- cavitation /
- electrocatalysis /
- cyclic voltammetry
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