Journal
CHEMISTRY OF MATERIALS
Volume 27, Issue 21, Pages 7459-7467Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03546
Keywords
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Funding
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Sheik Saqr Laboratory
- Department of Science and Technology, India (DST)
- Council of Scientific and Industrial Research
- DST for the Ramanujan fellowship [SR/S2/RJN-24/2010]
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Pd2Ge nanoparticles were synthesized by superhydride reduction of K2PdCl4 and GeCl4. The syntheses were performed using a solvothermal method in the absence of surfactants, and the size of the nanoparticles was controlled by varying the reaction time. The powder X-ray diffraction (PXRD) and transmission electron microscopy data suggest that Pd2Ge nanoparticles were formed as an ordered intermetallic phase. In the crystal structure, Pd and Ge atoms occupy two different crystallographic positions with a vacancy in one of the Ge sites, which was proved by PXRD and energy-dispersive X-ray analysis. The catalyst is highly efficient for the electrochemical oxidation of ethanol and is stable up to the 250th cycle in alkaline medium. The electrochemical active surface area and current density values obtained, 1.41 cm(2) and 4.1 mA cm(-2), respectively, are superior to those of the commercial Pd on carbon. The experimentally observed data were interpreted in terms of the combined effect of adsorption energies of CH3CO and OH radical, d-band center model, and work function of the corresponding catalyst surfaces.
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