Engineering Metal Alloy Nanocrystals Anchored on N-Doped Nanoporous Carbon for Li-O2 Batteries

摘要

The development of highly efficient oxygen catalysts is crucial for improving the storage capacity and stability of Li-O-2 batteries. Herein, we report a simple engineering method to prepare the composite electrocatalyst of the CoNi alloy nanoparticles anchored on the N-doped porous carbon substrate (CoNi/NC), which exhibits the enhanced electrocatalytic performance for the Li-O-2 batteries due to the synergetic effect between the bimetal CoNi alloy and the N-doped porous carbon framework. The porous structure can expose more active sites, enhance the mass transfer, and temporarily store the Li2O2 intermediate. The CoNi/NC catalyst makes the batteries show a high discharge capacity of 17783 mA h g(-1), a low overvoltage of 1.03 V, and long cycle life of 194 cycles. These results indicate that such a simple engineering preparation method can benefit the large-scale production of high-efficiency and cost-effective electrocatalysts for energy applications.

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