Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 14, Pages 5485-5492Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp900493c
Keywords
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Funding
- National Natural Science Foundation of China [20675076, 20735003, 20820102037]
- National High Technical Development Project (863 Project) Foundation of China [2007AA061501]
- 973 Project [2009CB930100]
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In this contribution, we for the first time report the synthesis of raspberry-like hierarchical Au/Pt nanoparticle (NP) assembling hollow spheres (RHAHS) with pore structure and complex morphology through one in situ sacrificial template approach without any post-treatment procedure. This method has some clear advantages including simplicity, quickness, high quality, good reproducibility, and no need of a complex post-treatment process (removing templating). Furthermore, the present method could be extended to other metal-based NP assembling hollow spheres. Most importantly, the as-prepared RHAHS exhibited excellent electrocatalytic activity for oxygen reduction reaction (ORR). For instance, the present RHAHS-modified electrode exhibited more positive potential (the half-wave potential at about 0.6 V), higher specific activity, and higher mass activity for ORR than that of commercial platinum black (CPB). Rotating ring-disk electrode (RRDE) voltarnmetry demonstrated that the RHAHS-modified electrode could almost catalyze a four-electron reduction of O-2 to H2O in a 0.5 M air-saturated H2SO4 solution. The present RHAHS may hold great promise as an advanced material for applications in fuel cells, biosensors and electrochemical devices.
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