Pd–Ni electrocatalysts for efficient ethanol oxidation reaction in alkaline electrolyte

摘要: Abstract PdxNiy/C catalysts with high ethanol oxidation reaction (EOR) activity in alkaline solution have been prepared through a phase-based nanocapsule method. XRD and TEM show PdxNiy nanoparticles small average diameter (2.4–3.2 nm) narrow size distribution (1–6 nm) were homogeneously dispersed on carbon black XC-72 support. The EOR onset potential Pd4Ni5/C (−801 mV vs. Hg/HgO) was observed shifted 180 mV more negative than that of Pd/C. Its exchange current density 33 times higher Pd/C (41.3 × 10−7 A/cm2 1.24 × 10−7 A/cm2). After 10,000-s chronoamperometry test at −0.5 V (vs Hg/HgO), the mass Pd2Ni3/C survived 1.71 mA/mg, while had dropped to 0, indicating better ’detoxification’ ability for We propose surface Ni could promote refreshing Pd active sites, thus enhancing overall kinetics. method is able not only control over Pd–Ni particles, but also facilitate formation efficient contacts between catalyst surface, which key improving activity.