期刊
CHEMELECTROCHEM
卷 5, 期 14, 页码 1886-1890出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201800094
关键词
nano-impact electrochemistry; nanoparticles; silver nanoparticles; electrocatalysis; oxygen reduction reaction
资金
- Deutsche Forschungsgemeinschaft [FOR 2397-1, SCHU 929/15-1]
- Cluster of Excellence Resolv [EXC1069]
The activity towards the oxygen reduction reaction (ORR) of single silver nanoparticles (AgNP) was quantified by using AgNP impacts on dual-bore carbon nanoelectrodes in highly alkaline media. We found suitable conditions for the particles to adhere sufficiently stably for detailed electrochemical characterization of a single particle. The special electrode design opens the possibility to dose gaseous oxygen to the nanoparticle under study. Deactivation of the catalytic activity of the AgNP upon excessive exposure to oxygen as well as the recovery of catalytic activity under reducing conditions is presumably attributed to hydrogen evolution at the applied low potentials. The proposed approach allows mechanistic parameters for the ORR to be extracted at a single AgNP in highly alkaline media in the absence of any binder materials and under exclusion of averaging ensemble effects.
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