期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 21, 页码 10544-10553出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02293j
关键词
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资金
- CSIR
Activity and stability are the key issues for any catalyst. Importantly, the synthesis of catalysts should be facile. Here, we report one-step facile electroless synthesis of ultrafine bimetallic PdPt nanoparticles (similar to 2 nm) dispersed in hetero-atom doped hollow carbon nanospheres (HCNSs) and PdPt nanoparticles in carbon nanostructures (CNSs) as highly active and stable electrocatalysts for electro-oxidation/-reduction of low molecular weight alcohols such as methanol and ethanol/of oxygen. HCNSs inhibit some of the electrochemical degradation pathways such as migration, agglomeration, isolation and detachment of nanoparticles. The superior mass activity of ultrafine PdPt nanoparticles for methanol/ethanol electro-oxidation (12-/8-fold), excellent operational stability, and high J(f)/J(b) ratio over commercially available state-of-the-art Pt-C (20 wt%) make them a potential fuel cell anode catalyst. The activity is further improved when PdPt-HCNS and PdPt-CNS are taken together suggesting a synergistic effect. Further, oxygen reduction reaction (ORR) study with embedded nanostructures exhibits a positive ORR peak potential, positive on-set potential (Delta Eon-set similar to -50 mV) & half-wave potential (Delta E-1/2 similar to -25 mV), low Tafel slope (53 mV dec(-1)), enhanced current density and superior stability compared to that of Pt-C along with preferential 4e(-) ORR pathways. Overall, the catalyst reported here is a potential anode and cathode catalyst for direct alcohol alkaline as well as hydrogen fuel cells.
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