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Design of active and stable oxygen reduction reaction catalysts by embedding CoxOy nanoparticles into nitrogen-doped carbon

AuthorsYang, Fan; Abadia, Mikel; Chen, Chaoqiu; Wang, Weike; Li, Le; Zhang, Lianbing; Rogero, Celia ; Chuvilin, Andrey; Knez, Mato
KeywordsAtomic layer deposition
Cobalt oxide
Oxygen reduction reaction
Issue Date2017
PublisherSpringer Nature
CitationNano Research 10(1): 97-107 (2017)
AbstractThe oxygen reduction reaction (ORR) is essential in research pertaining to life science and energy. In applications, platinum-based catalysts give ideal reactivity, but, in practice, are often subject to high costs and poor stability. Some cost-efficient transition metal oxides have exhibited excellent ORR reactivity, but the stability and durability of such alternative catalyst materials pose serious challenges. Here, we present a facile method to fabricate uniform Co x O y nanoparticles and embed them into N-doped carbon, which results in a composite of extraordinary stability and durability, while maintaining its high reactivity. The half-wave potential shows a negative shift of only 21 mV after 10,000 cycles, only one third of that observed for Pt/C (63 mV). Furthermore, after 100,000 s testing at a constant potential, the current decreases by only 17%, significantly less than for Pt/C (35%). The exceptional stability and durability results from the system architecture, which comprises a thin carbon shell that prevents agglomeration of the Co x O y nanoparticles and their detaching from the substrate.
Publisher version (URL)https://doi.org/10.1007/s12274-016-1269-5
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