Synergistic Effects of C/α-MoC and Ag for Efficient Oxygen Reduction Reaction.
Lujie CaoPengpeng TaoMinchan LiFucong LyuZhenyu WangSisi WuWenxi WangYifeng HuoLi HuangZhouguang LuPublished in: The journal of physical chemistry letters (2018)
It remains challenging to prepare highly active and stable catalysts from earth-abundant elements for the oxygen reduction reaction (ORR). Herein we report a facile method to synthesize cost-effective heterogeneous C/α-MoC/Ag electrocatalysts. Rotating disc electrode (RDE) experiments revealed that the obtained C/α-MoC/Ag exhibited much superior catalytic performance for ORR than that of C/Ag, C/α-MoC, or even the conventional Pt/C. First-principles calculations indicated that the enhanced activity could be attributed to the efficient synergistic effects between Ag and α-MoC/C by which the energy barrier for O2 dissociation has been substantially reduced. Furthermore, Li-air and Al-air cells were assembled to demonstrate the unprecedented electrochemical performance of C/α-MoC/Ag nanocomposites surpassing the Pt/C. Thus experimental results and theoretical calculations together showed that the heterogeneous C/α-MoC/Ag nanocomposites are a promising alternative to platinum for applications in industrial metal-air batteries.
Keyphrases
- quantum dots
- visible light
- highly efficient
- density functional theory
- molecular dynamics simulations
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- heavy metals
- single cell
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- wastewater treatment
- risk assessment
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- solid state
- ionic liquid
- endoplasmic reticulum stress
- molecularly imprinted