Synthesis of core/shell structured Pd3Au@Pt/C with enhanced electrocatalytic activity by regioselective atomic layer deposition combined with a wet chemical method. Issue 71 (13th July 2016)

• Record Type: Journal Article
• Authors: Liu, Huiyuan; Song, Yujiang; Li, Shushuang; Li, Jia; Liu, Yuan; Jiang, Ying-Bing; Guo, Xinwen
• Is Part Of: RSC advances. Volume 6:Issue 71(2016)
• Page Start: 66712
• Page End: 66720
• Publication Date: 2016-07-13
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra04990g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Core/shell structured Pd3 Au@Pt/C created by regioselective atomic layer deposition combined with a wet chemical method demonstrates improved electrocatalytic activity toward formic acid oxidation and oxygen reduction compared with commercial Pt/C. Abstract : We report the synthesis of Pd3 Au@Pt/C by atomic layer deposition (ALD) combined with a wet chemical method. Initially, nearly uniform Pd3 Au nanoparticles (NPs) (∼4.7 nm) supported on carbon with a loading of ∼20 wt% were prepared by reducing metal complexes confined in reverse micelles adsorbed on carbon. Next, a Pt thin layer (less than 1 nm) was selectively deposited on purified Pd3 Au particles instead of on carbon by regioselective ALD that likely arises from the coverage of nucleation sites on carbon by surfactant molecules in conjunction with catalytic decomposition of the Pt precursor on Pd3 Au. The resulting core–shell structured material was subject to TEM, HAADF-STEM/EDX, XRD, XPS and electrochemical measurements. Interestingly, Pd3 Au@Pt/C demonstrates a significantly improved electrocatalytic activity toward both formic acid oxidation reaction (FAOR) and oxygen reduction reaction (ORR) compared with Pd3 Au/C and state-of-the art Pt/C. This study opens up a unique avenue for the synthesis core/shell structured materials with potential applications in catalysis, electrocatalysis, and so on.