Abstract
To facilitate the electrocatalytic behavior of Direct Ethanol Fuel Cells (DEFCs), a sequence of bimetallic PdxCuy/Ni2P-C catalysts are synthesized via the microwave-assisted ethylene glycol reduction method. The results indicate that our designed Pd2Cu/Ni2P-C(1:1) catalyst owns high activity (3974.08 mA mg−1Pd), 8.3 times higher than the commercial Pd/C. The durability and the CO tolerance of the corresponding catalysts are also investigated by chronoamperometry (CA) and CO stripping measurements, implying Pd2Cu/Ni2P-C(1:1) shows good durability and the anti-CO poisoning ability for EOR in alkaline media. The electrochemical impedance spectra (EIS) analysis reveals lower charge transfer resistance for Pd2Cu/Ni2P-C(1:1). Combined with the results of XRD, HRTEM, XPS and electrochemical measurements, we found that the good electrocatalytic activity, CO tolerance and long-term durability of Pd2Cu/Ni2P-C(1:1) may be provided by the electronic and strain effect among Pd, Cu and Ni2P, which will bring the downshift in the d-band center of catalysts and the weakened adsorption of intermediates.
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