Details

Autor(en) / Beteiligte

• Wang, Zhifei
• Zheng, Shuang
• Wan, Neng
• Zhang, Liming
• Wang, Qilong
• He, Nongyue
• Huang, Yaji

Titel

Synthesis of a Au-on-Pd Heteronanostructure Stabilized by Citrate and its Catalytic Application

Ist Teil von

• Particle & particle systems characterization, 2013-10, Vol.30 (10), p.905-910

Ort / Verlag

Weinheim: Blackwell Publishing Ltd

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• The preparation of Au‐on‐Pd heteronanostructure (HNS) using citrate‐stabilized polycrystalline Pd nanoparticles (NPs) as the seeds is described. The resulting Au‐on‐Pd HNS is characterized and it is found that the formation of Au‐on‐Pd HNS depends greatly on a ratio between Pd seeds and AuCl4− ions added and the optimal molar ratio is 10:1. If fewer AuCl4− ions are added (Pd/Au ratio is 100:1), the growth of Au NPs only occurs on part of the Pd seeds’ surface. The addition of more AuCl4− ions (Pd/Au ratio is 5:1) hinders the growth of Au NPs on the Pd seeds’ surface. To demonstrate the catalytic performance, the electrochemistry oxidation of ethanol and the reduction of p‐nitrophenol by NaBH4 are chosen to examine the catalytic activity of Au‐on‐Pd HNS. Pd seeds, Au NPs, and poly(vinyl pyrrolidone) (PVP)‐stabilized PdAu nanoalloy are used as the references for comparison. In the first reaction, the catalytic reactivity of Au‐on‐Pd HNS is better than that of corresponding pure Pd or Au NPs, while the opposite occurs for the latter reaction. The catalytic activity of Au‐on‐Pd HNS is much higher than that of PVP‐stabilized PdAu nanoalloy. The formation of Au‐on‐Pd heteronanostructures depends greatly on the Pd/Au molar ratio when citrate‐stabilized polycrystalline Pd nanoparticles are used as the seed. The catalytic performance, evaluated by the model reactions, demonstrates the advantage of using citrate as the stabilizer, in comparison with the strong ligand poly(vinyl pyrrolidone) (PVP)‐stabilized PdAu nanoalloy.