Abstract
A series of tri-functional nanoflower (NF) catalysts with numerous nanodendrites (Pt3NiRh, Pt3NiRu, Pt3NiPd, Pt3Ni, and Pt2Ni2Rh NFs) were synthesized by introducing Rh, Ru, and Pd into Pt-Ni nanoflowers, aiming at accelerating the sluggish kinetics of oxygen reduction reaction (ORR), methanol oxidation reaction (MOR), and hydrogen evolution reaction (HER). The as-prepared catalysts displayed superior anti-poisoning ability and excellent activity due to uniform morphology and good dispersibility. Their electrochemical characterization revealed that the Pt3NiRh NFs showed the highest mass activity (2.17 AmgPGM-1) and specific activity (3.13 mA cm-2) toward ORR, close to 9.9 and 4.6 times higher than the values measured on Pt/C (46.7 %). As for MOR, mass and specific activities of Pt3NiRh NFs were 1.88 AmgPGM-1 and 2.62 mA cm-2, far exceeding the values on commercial Pt/C. Moreover, HER activity of Pt3NiRh NFs outperformed commercial Pt/C. This work is valuable to develop promising multi-functional catalysts with enhanced activity and anti-poisoning ability.
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