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Surface‐Roughened Pt‐Decorated Pd Nanoparticles as Efficient Electrocatalysts for Direct Alcohol Fuel Cells
Author(s) -
Prabu Natarajan,
Jeyakumar Duraisamy,
Maduraiveeran Govindhan,
Sasidharan Manickam
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800600
Subject(s) - chemistry , cyclic voltammetry , x ray photoelectron spectroscopy , catalysis , high resolution transmission electron microscopy , platinum , electrochemistry , nanoparticle , methanol , electrocatalyst , alcohol oxidation , nuclear chemistry , inorganic chemistry , transmission electron microscopy , chemical engineering , nanotechnology , materials science , organic chemistry , engineering , electrode
Platinum‐decorated Pd nanoparticles (NPs) of Pd 100– x Pt x ( x = 30, 40 and 50) are synthesised by galvanic replacement of Ag by Pt using a Pd@Ag core–shell structure as a template. The Pd@Ag core–shell material is prepared by chemical reduction of Ag + over Pd NPs, with further Ag being galvanically replaced by Pt to form Pd 100– x Pt x NPs. The Pd 100– x Pt x NPs are characterised using optical absorption spectroscopy with surface plasmon resonance (SPR), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). The NPs are adsorbed onto vulcan carbon (Pd 100– x Pt x /C) for further characterisation and electrochemical studies. The materials are characterised using powder X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) studies. The CV studies indicate the absence of silver in the synthesised materials. The electrochemical oxidation of methanol and ethanol are carried out by cyclic voltammetry studies. The results show that Pd 100– x Pt x /C materials are good catalysts for methanol oxidation reactions (MORs) and ethanol oxidation reactions (EORs), with lower oxidation potentials and higher mass activities than commercial Pt/C catalysts. Among these materials, Pd 50 Pt 50 /C has a methanol oxidation potential of 0.18 V, with good mass activity, and the Pd 70 Pt 30 /C material is an efficient EOR catalyst, with higher mass activity than commercial Pt/C catalysts.