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Engineering Isolated CoV-N x Sites and CoV Nanoparticles on Graphene: A Synergistic Platform for Oxygen Reduction Catalysis
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DOI：10.1021/acsaenm.6c00042.png)
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Abstract
En 中文
The oxygen reduction reaction (ORR) has attracted significant interest as a key cathode reaction in emerging energy technologies, such as fuel cells and metal-air batteries, aimed at improving the present energy landscape and advancing sustainable energy solutions. Metal-nitrogen-carbon (M-N x -C) materials have been extensively investigated as potential alternatives to Pt-based catalysts due to their promising ORR activity. In this study, cobalt-vanadium isolated atoms/nanoparticles on nitrogen-doped graphene oxide (CVSA-NP/NG) were synthesized as an ORR catalyst. Different compositions of CVSA-NP/NG, besides the control samples, were prepared and analyzed by employing spectroscopy and electrochemical methods. Electrochemical results demonstrate that the best composition (CV(11)SA-NP/NG) exhibits high ORR catalytic performance, achieving an onset potential (Eonset) value of 0.92 and 0.79 V in 0.1 M KOH and 0.1 M HClO4, respectively. CV(11)SA-NP/NG catalyzes the ORR via a four-electron transfer process, converting O2 directly to OH- or H2O. The KSCN test confirms the presence of two types of active sites, namely CoV-N x and CoV nanoparticles.
Keywords:
electrocatalysis
oxygen reduction reaction
isolated metal atoms
bimetallic system
nitrogen-dopedgraphene oxide
Journal
A
IF:
3.5
Papers:
856
Citations:
1.2K