Author(s) Gong, Y.; Zhong, H.; Liu, W.; Zhang, B.; Hu, S.; Wang, R.
Journal ACS Appl Mater Interfaces
Date Published 2017 Dec 13

Bimetallic Pd-Au nanoparticles (NPs) usually show superior catalytic performances over their single component counterparts, the general and facile synthesis of subnanometer-scaled Pd-Au NPs still remains a great challenge, especially for electronegative ultrafine bimetallic NPs. Here, we develop an anion-exchange strategy for the preparation of ultrafine Pd-Au alloy NPs. Simple treatment of main-chain imidazolium-based organic polymer (IOP) with HAuCl4 and Na2PdCl4, and followed by reduction with NaBH4 generated Pd-Au alloy NPs (Pd-Au/IOP). These NPs possess an unprecedented tiny size of 1.50±0.20 nm, and are uniformly dispersed over IOP. The electronic structure of surface Pd and Au atoms is optimized via electron exchange during alloying, a net charge flowing resutling from counter anions is injected into Au and Pd to form a strong ensemble effect, which is responsible for remarkably higher catalytic activity of Pd-Au/IOP in hydrolysis dehydrogenation of ammonia borane than those of monometallic counterparts.

DOI 10.1021/acsami.7b16794
ISSN 1944-8252
Citation ACS Appl Mater Interfaces. 2017.

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