Hongxia Liu,Meng Wang,Xuqiang Zhang,Jiantai Ma,Gongxuan Lu
The development of an active but cheaper catalyst is critical for efficient photocatalytic hydrogen from renewable source. In this study, we develop a high active catalyst for hydrogen evolution from formaldehyde via alloying of Pd with Ag and sensitization with a dye eosin Y (EY). The XRD, XPS, TEM and HRTEM characterizations indicate that the catalyst exhibits a core-shell structure (Ag core and Ag-Pd shell). Alloying Pd with Ag not only provides more efficient catalytic sites than single component Pd catalyst, but greatly promotes the efficient electron transfer and prolongs the lifetime of photogenerated electrons, enhances the charge separation efficiency and the photocatalytic hydrogen evolution activity significantly. The catalyst activity for hydrogen is highly dependent on the adsorption energies of HCHO and H 2 O molecules on metal surface of the alloy catalyst. Our results disclose a new route to high efficient catalyst development for solar hydrogen generation from formaldehyde.
Daohua Sun,Pengyao Li,Bin Yang,Yan Xu,Jiale Huang,Qingbiao Li
Monodisperse AgPd nanoparticles (NPs) were successfully synthesized by coreducing silver nitrate and palladium chloride in the presence of oleylamine. Characterization techniques such as transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction were employed to verify the alloy nature of the obtained NPs. These AgPd NPs, supported on carbon, were found to be active catalysts for the generation of hydrogen from the methanolysis of ammonia borane at room temperature. The catalytic activity depended on the alloy composition, and the Ag30Pd70 NPs displayed the greatest activity among the tested catalysts, with a very high total turnover frequency value of 366.4 min−1 and activation energy of 37.5 kJ mol−1. In a reusability test, the Ag30Pd70/C catalyst retained 67% of its initial activity and 100% conversion after eight cycles.
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